The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.
expat: Large number of prefixed XML attributes on a single tag can crash libexpat (CVE-2021-45960)
expat: Integer overflow in function XML_GetBuffer (CVE-2022-23852)
The overflow protection in Expat is removed by compilers with certain optimization settings, which allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via crafted XML data. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-1283 and CVE-2015-2716.
(CVE-2016-4472)
The XML parser in Expat does not use sufficient entropy for hash initialization, which allows context- dependent attackers to cause a denial of service (CPU consumption) via crafted identifiers in an XML document. NOTE: this vulnerability exists because of an incomplete fix for CVE-2012-0876. (CVE-2016-5300)
XML External Entity vulnerability in libexpat 2.2.0 and earlier (Expat XML Parser Library) allows attackers to put the parser in an infinite loop using a malformed external entity definition from an external DTD. (CVE-2017-9233)
In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks). (CVE-2018-20843)
In libexpat before 2.2.8, crafted XML input could fool the parser into changing from DTD parsing to document parsing too early; a consecutive call to XML_GetCurrentLineNumber (or XML_GetCurrentColumnNumber) then resulted in a heap-based buffer over-read. (CVE-2019-15903)
In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integer overflow exists for m_groupSize. (CVE-2021-46143)
addBinding in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow. (CVE-2022-22822)
build_model in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow. (CVE-2022-22823)
defineAttribute in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
(CVE-2022-22824)
lookup in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow. (CVE-2022-22825)
nextScaffoldPart in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
(CVE-2022-22826)
storeAtts in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow. (CVE-2022-22827)
Expat (aka libexpat) before 2.4.4 has an integer overflow in the doProlog function. (CVE-2022-23990)
In Expat (aka libexpat) before 2.4.5, an attacker can trigger stack exhaustion in build_model via a large nesting depth in the DTD element. (CVE-2022-25313)
In libexpat through 2.4.9, there is a use-after free caused by overeager destruction of a shared DTD in XML_ExternalEntityParserCreate in out-of-memory situations. (CVE-2022-43680)
libexpat through 2.5.0 allows a denial of service (resource consumption) because many full reparsings are required in the case of a large token for which multiple buffer fills are needed. (CVE-2023-52425)
libexpat through 2.5.0 allows recursive XML Entity Expansion if XML_DTD is undefined at compile time.
(CVE-2023-52426)
Note that Nessus has not tested for these issues but has instead relied on the package manager’s report that the package is installed.
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory expat. The text
# itself is copyright (C) Red Hat, Inc.
##
include('compat.inc');
if (description)
{
script_id(195622);
script_version("1.1");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/05/11");
script_cve_id(
"CVE-2016-4472",
"CVE-2016-5300",
"CVE-2017-9233",
"CVE-2018-20843",
"CVE-2019-15903",
"CVE-2021-45960",
"CVE-2021-46143",
"CVE-2022-22822",
"CVE-2022-22823",
"CVE-2022-22824",
"CVE-2022-22825",
"CVE-2022-22826",
"CVE-2022-22827",
"CVE-2022-23852",
"CVE-2022-23990",
"CVE-2022-25313",
"CVE-2022-43680",
"CVE-2023-52425",
"CVE-2023-52426"
);
script_xref(name:"CEA-ID", value:"CEA-2021-0025");
script_name(english:"RHEL 6 : expat (Unpatched Vulnerability)");
script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat 6 host is affected by multiple vulnerabilities that will not be patched.");
script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple
vulnerabilities that have been acknowledged by the vendor but will not be patched.
- expat: Large number of prefixed XML attributes on a single tag can crash libexpat (CVE-2021-45960)
- expat: Integer overflow in function XML_GetBuffer (CVE-2022-23852)
- The overflow protection in Expat is removed by compilers with certain optimization settings, which allows
remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via crafted XML
data. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-1283 and CVE-2015-2716.
(CVE-2016-4472)
- The XML parser in Expat does not use sufficient entropy for hash initialization, which allows context-
dependent attackers to cause a denial of service (CPU consumption) via crafted identifiers in an XML
document. NOTE: this vulnerability exists because of an incomplete fix for CVE-2012-0876. (CVE-2016-5300)
- XML External Entity vulnerability in libexpat 2.2.0 and earlier (Expat XML Parser Library) allows
attackers to put the parser in an infinite loop using a malformed external entity definition from an
external DTD. (CVE-2017-9233)
- In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons
could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be
usable for denial-of-service attacks). (CVE-2018-20843)
- In libexpat before 2.2.8, crafted XML input could fool the parser into changing from DTD parsing to
document parsing too early; a consecutive call to XML_GetCurrentLineNumber (or XML_GetCurrentColumnNumber)
then resulted in a heap-based buffer over-read. (CVE-2019-15903)
- In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integer overflow exists for
m_groupSize. (CVE-2021-46143)
- addBinding in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow. (CVE-2022-22822)
- build_model in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow. (CVE-2022-22823)
- defineAttribute in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
(CVE-2022-22824)
- lookup in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow. (CVE-2022-22825)
- nextScaffoldPart in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
(CVE-2022-22826)
- storeAtts in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow. (CVE-2022-22827)
- Expat (aka libexpat) before 2.4.4 has an integer overflow in the doProlog function. (CVE-2022-23990)
- In Expat (aka libexpat) before 2.4.5, an attacker can trigger stack exhaustion in build_model via a large
nesting depth in the DTD element. (CVE-2022-25313)
- In libexpat through 2.4.9, there is a use-after free caused by overeager destruction of a shared DTD in
XML_ExternalEntityParserCreate in out-of-memory situations. (CVE-2022-43680)
- libexpat through 2.5.0 allows a denial of service (resource consumption) because many full reparsings are
required in the case of a large token for which multiple buffer fills are needed. (CVE-2023-52425)
- libexpat through 2.5.0 allows recursive XML Entity Expansion if XML_DTD is undefined at compile time.
(CVE-2023-52426)
Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package
is installed.");
script_set_attribute(attribute:"solution", value:
"The vendor has acknowledged the vulnerabilities but no solution has been provided. Refer to the vendor for remediation
guidance.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/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:"cvss_score_source", value:"CVE-2021-45960");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2022-23852");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vendor_unpatched", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2016/06/07");
script_set_attribute(attribute:"plugin_publication_date", value:"2024/05/11");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:5");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:compat-expat1");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:expat");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:firefox");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:mingw-virt-viewer");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:thunderbird");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:xmlrpc-c");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:xulrunner");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Red Hat Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl", "redhat_repos.nasl");
script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");
exit(0);
}
include('rpm.inc');
include('rhel.inc');
if (!get_kb_item("global_settings/vendor_unpatched"))
exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/RedHat/release');
if (isnull(os_release) || 'Red Hat' >!< os_release) audit(AUDIT_OS_NOT, 'Red Hat');
var os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
os_ver = os_ver[1];
if (!rhel_check_release(operator: 'ge', os_version: os_ver, rhel_version: '6')) audit(AUDIT_OS_NOT, 'Red Hat 6.x', 'Red Hat ' + os_ver);
if (!get_kb_item('Host/RedHat/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);
var constraints = [
{
'pkgs': [
{'reference':'compat-expat1', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'unpatched_pkg':'compat-expat1', 'cves':['CVE-2016-4472', 'CVE-2017-9233', 'CVE-2018-20843', 'CVE-2019-15903', 'CVE-2022-23990', 'CVE-2022-43680']},
{'reference':'expat', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'unpatched_pkg':'expat', 'cves':['CVE-2016-5300', 'CVE-2018-20843', 'CVE-2019-15903', 'CVE-2021-45960', 'CVE-2021-46143', 'CVE-2022-22822', 'CVE-2022-22823', 'CVE-2022-22824', 'CVE-2022-22825', 'CVE-2022-22826', 'CVE-2022-22827', 'CVE-2022-23852', 'CVE-2022-23990', 'CVE-2022-25313', 'CVE-2022-43680', 'CVE-2023-52425', 'CVE-2023-52426']},
{'reference':'firefox', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE, 'unpatched_pkg':'firefox', 'cves':['CVE-2017-9233', 'CVE-2019-15903', 'CVE-2021-45960', 'CVE-2021-46143', 'CVE-2022-22822', 'CVE-2022-22823', 'CVE-2022-22824', 'CVE-2022-22825', 'CVE-2022-22826', 'CVE-2022-22827', 'CVE-2022-23852']},
{'reference':'thunderbird', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE, 'unpatched_pkg':'thunderbird', 'cves':['CVE-2017-9233', 'CVE-2021-45960', 'CVE-2021-46143', 'CVE-2022-22822', 'CVE-2022-22823', 'CVE-2022-22824', 'CVE-2022-22825', 'CVE-2022-22826', 'CVE-2022-22827', 'CVE-2022-23852']},
{'reference':'xulrunner', 'release':'6', 'rpm_spec_vers_cmp':TRUE, 'unpatched_pkg':'xulrunner', 'cves':['CVE-2016-4472', 'CVE-2017-9233', 'CVE-2021-45960', 'CVE-2021-46143', 'CVE-2022-22822', 'CVE-2022-22823', 'CVE-2022-22824', 'CVE-2022-22825', 'CVE-2022-22826', 'CVE-2022-22827', 'CVE-2022-23852']}
]
}
];
var flag = 0;
foreach var constraint_array ( constraints ) {
var repo_relative_urls = NULL;
var enterprise_linux_flag = rhel_repo_urls_has_content_dist_rhel(repo_urls:repo_relative_urls);
foreach var pkg ( constraint_array['pkgs'] ) {
var unpatched_pkg = NULL;
var _release = NULL;
var sp = NULL;
var el_string = NULL;
var rpm_spec_vers_cmp = NULL;
var exists_check = NULL;
var cves = NULL;
if (!empty_or_null(pkg['unpatched_pkg'])) unpatched_pkg = pkg['unpatched_pkg'];
if (!empty_or_null(pkg['release'])) _release = 'RHEL' + pkg['release'];
if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
if (unpatched_pkg &&
_release &&
(!exists_check || rpm_exists(release:_release, rpm:exists_check)) &&
unpatched_package_exists(release:_release, package:unpatched_pkg, cves: cves)) flag++;
}
}
if (flag)
{
var extra = NULL;
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : unpatched_packages_report()
);
exit(0);
}
else
{
var tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'compat-expat1 / expat / firefox / thunderbird / xulrunner');
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4472
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-5300
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-9233
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20843
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15903
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-45960
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-46143
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22822
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22823
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22824
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22825
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22826
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22827
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-23852
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-23990
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-25313
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-43680
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-52425
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-52426