SUSE SLED15 / SLES15 Security Update : fuse (SUSE-SU-2018:3260-1)

2019-01-02T00:00:00
ID SUSE_SU-2018-3260-1.NASL
Type nessus
Reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2021-06-02T00:00:00

Description

This update for fuse fixes the following issues :

CVE-2018-10906: fusermount was vulnerable to a restriction bypass when SELinux is active. This allowed 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 (bsc#1101797)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. 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 SUSE update advisory SUSE-SU-2018:3260-1.
# The text itself is copyright (C) SUSE.
#

include("compat.inc");

if (description)
{
  script_id(120136);
  script_version("1.3");
  script_cvs_date("Date: 2019/09/10 13:51:49");

  script_cve_id("CVE-2018-10906");

  script_name(english:"SUSE SLED15 / SLES15 Security Update : fuse (SUSE-SU-2018:3260-1)");
  script_summary(english:"Checks rpm output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote SUSE host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"This update for fuse fixes the following issues :

CVE-2018-10906: fusermount was vulnerable to a restriction bypass when
SELinux is active. This allowed 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 (bsc#1101797)

Note that Tenable Network Security has extracted the preceding
description block directly from the SUSE security advisory. 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://bugzilla.suse.com/show_bug.cgi?id=1101797"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2018-10906/"
  );
  # https://www.suse.com/support/update/announcement/2018/suse-su-20183260-1/
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?45dec9c9"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"To install this SUSE Security Update use the SUSE recommended
installation methods like YaST online_update or 'zypper patch'.

Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Module for Basesystem 15:zypper in -t patch
SUSE-SLE-Module-Basesystem-15-2018-2340=1"
  );
  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:novell:suse_linux:fuse");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:fuse-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:fuse-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:fuse-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:fuse-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libfuse2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libfuse2-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libulockmgr1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libulockmgr1-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:15");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/07/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/10/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/01/02");
  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:"SuSE Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/SuSE/release", "Host/SuSE/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/SuSE/release");
if (isnull(release) || release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "SUSE");
os_ver = os_ver[1];
if (! preg(pattern:"^(SLED15|SLES15)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLED15 / SLES15", "SUSE " + os_ver);

if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu !~ "^i[3-6]86$" && "x86_64" >!< cpu && "s390x" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "SUSE " + os_ver, cpu);

sp = get_kb_item("Host/SuSE/patchlevel");
if (isnull(sp)) sp = "0";
if (os_ver == "SLES15" && (! preg(pattern:"^(0)$", string:sp))) audit(AUDIT_OS_NOT, "SLES15 SP0", os_ver + " SP" + sp);
if (os_ver == "SLED15" && (! preg(pattern:"^(0)$", string:sp))) audit(AUDIT_OS_NOT, "SLED15 SP0", os_ver + " SP" + sp);


flag = 0;
if (rpm_check(release:"SLES15", sp:"0", reference:"fuse-2.9.7-3.3.1")) flag++;
if (rpm_check(release:"SLES15", sp:"0", reference:"fuse-debuginfo-2.9.7-3.3.1")) flag++;
if (rpm_check(release:"SLES15", sp:"0", reference:"fuse-debugsource-2.9.7-3.3.1")) flag++;
if (rpm_check(release:"SLES15", sp:"0", reference:"fuse-devel-2.9.7-3.3.1")) flag++;
if (rpm_check(release:"SLES15", sp:"0", reference:"fuse-doc-2.9.7-3.3.1")) flag++;
if (rpm_check(release:"SLES15", sp:"0", reference:"libfuse2-2.9.7-3.3.1")) flag++;
if (rpm_check(release:"SLES15", sp:"0", reference:"libfuse2-debuginfo-2.9.7-3.3.1")) flag++;
if (rpm_check(release:"SLES15", sp:"0", reference:"libulockmgr1-2.9.7-3.3.1")) flag++;
if (rpm_check(release:"SLES15", sp:"0", reference:"libulockmgr1-debuginfo-2.9.7-3.3.1")) flag++;
if (rpm_check(release:"SLED15", sp:"0", reference:"fuse-2.9.7-3.3.1")) flag++;
if (rpm_check(release:"SLED15", sp:"0", reference:"fuse-debuginfo-2.9.7-3.3.1")) flag++;
if (rpm_check(release:"SLED15", sp:"0", reference:"fuse-debugsource-2.9.7-3.3.1")) flag++;
if (rpm_check(release:"SLED15", sp:"0", reference:"fuse-devel-2.9.7-3.3.1")) flag++;
if (rpm_check(release:"SLED15", sp:"0", reference:"fuse-doc-2.9.7-3.3.1")) flag++;
if (rpm_check(release:"SLED15", sp:"0", reference:"libfuse2-2.9.7-3.3.1")) flag++;
if (rpm_check(release:"SLED15", sp:"0", reference:"libfuse2-debuginfo-2.9.7-3.3.1")) flag++;
if (rpm_check(release:"SLED15", sp:"0", reference:"libulockmgr1-2.9.7-3.3.1")) flag++;
if (rpm_check(release:"SLED15", sp:"0", reference:"libulockmgr1-debuginfo-2.9.7-3.3.1")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "fuse");
}