The remote RHEL 8 host is affected by a vulnerability in mingw-expat (RHSA-2020:4846) with a security fix for the expat library leading to a DoS
Reporter | Title | Published | Views | Family All 173 |
---|---|---|---|---|
![]() | Fedora Update for expat FEDORA-2019-139fcda84d | 17 Jul 201900:00 | – | openvas |
![]() | openSUSE: Security Advisory for expat (openSUSE-SU-2019:1777-1) | 22 Jul 201900:00 | – | openvas |
![]() | Debian: Security Advisory (DLA-1839-1) | 30 Jun 201900:00 | – | openvas |
![]() | Huawei EulerOS: Security Advisory for expat (EulerOS-SA-2019-1841) | 23 Jan 202000:00 | – | openvas |
![]() | SUSE: Security Advisory (SUSE-SU-2019:1835-1) | 9 Jun 202100:00 | – | openvas |
![]() | SUSE: Security Advisory (SUSE-SU-2019:1834-1) | 19 Apr 202100:00 | – | openvas |
![]() | Fedora Update for expat FEDORA-2019-18868e1715 | 11 Jul 201900:00 | – | openvas |
![]() | Debian: Security Advisory (DSA-4472-1) | 29 Jun 201900:00 | – | openvas |
![]() | Huawei EulerOS: Security Advisory for expat (EulerOS-SA-2019-1783) | 23 Jan 202000:00 | – | openvas |
![]() | Mageia: Security Advisory (MGASA-2019-0274) | 28 Jan 202200:00 | – | openvas |
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2020:4846. The text
# itself is copyright (C) Red Hat, Inc.
##
include('compat.inc');
if (description)
{
script_id(142406);
script_version("1.13");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/11/08");
script_cve_id("CVE-2018-20843");
script_xref(name:"RHSA", value:"2020:4846");
script_xref(name:"CEA-ID", value:"CEA-2021-0025");
script_name(english:"RHEL 8 : mingw-expat (RHSA-2020:4846)");
script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing a security update for mingw-expat.");
script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in
the RHSA-2020:4846 advisory.
Expat is a C library for parsing XML documents. The mingw-expat packages provide a port of the Expat
library for MinGW.
Security Fix(es):
* expat: large number of colons in input makes parser consume high amount of resources, leading to DoS
(CVE-2018-20843)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and
other related information, refer to the CVE page(s) listed in the References section.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.3 Release Notes
linked from the References section.
Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
# https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.3_release_notes/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b7e37d18");
# https://security.access.redhat.com/data/csaf/v2/advisories/2020/rhsa-2020_4846.json
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b9fb58fe");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/updates/classification/#moderate");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2020:4846");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1723723");
script_set_attribute(attribute:"solution", value:
"Update the RHEL mingw-expat package based on the guidance in RHSA-2020:4846.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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:N/I:N/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-2018-20843");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_cwe_id(400);
script_set_attribute(attribute:"vendor_severity", value:"Moderate");
script_set_attribute(attribute:"vuln_publication_date", value:"2019/06/24");
script_set_attribute(attribute:"patch_publication_date", value:"2020/11/04");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/11/04");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:mingw-expat");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:mingw32-expat");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:mingw64-expat");
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) 2020-2024 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('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: '8')) audit(AUDIT_OS_NOT, 'Red Hat 8.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 = [
{
'repo_relative_urls': [
'content/dist/rhel8/8.10/aarch64/codeready-builder/debug',
'content/dist/rhel8/8.10/aarch64/codeready-builder/os',
'content/dist/rhel8/8.10/aarch64/codeready-builder/source/SRPMS',
'content/dist/rhel8/8.10/ppc64le/codeready-builder/debug',
'content/dist/rhel8/8.10/ppc64le/codeready-builder/os',
'content/dist/rhel8/8.10/ppc64le/codeready-builder/source/SRPMS',
'content/dist/rhel8/8.10/s390x/codeready-builder/debug',
'content/dist/rhel8/8.10/s390x/codeready-builder/os',
'content/dist/rhel8/8.10/s390x/codeready-builder/source/SRPMS',
'content/dist/rhel8/8.10/x86_64/codeready-builder/debug',
'content/dist/rhel8/8.10/x86_64/codeready-builder/os',
'content/dist/rhel8/8.10/x86_64/codeready-builder/source/SRPMS',
'content/dist/rhel8/8.6/aarch64/codeready-builder/debug',
'content/dist/rhel8/8.6/aarch64/codeready-builder/os',
'content/dist/rhel8/8.6/aarch64/codeready-builder/source/SRPMS',
'content/dist/rhel8/8.6/ppc64le/codeready-builder/debug',
'content/dist/rhel8/8.6/ppc64le/codeready-builder/os',
'content/dist/rhel8/8.6/ppc64le/codeready-builder/source/SRPMS',
'content/dist/rhel8/8.6/s390x/codeready-builder/debug',
'content/dist/rhel8/8.6/s390x/codeready-builder/os',
'content/dist/rhel8/8.6/s390x/codeready-builder/source/SRPMS',
'content/dist/rhel8/8.6/x86_64/codeready-builder/debug',
'content/dist/rhel8/8.6/x86_64/codeready-builder/os',
'content/dist/rhel8/8.6/x86_64/codeready-builder/source/SRPMS',
'content/dist/rhel8/8.8/aarch64/codeready-builder/debug',
'content/dist/rhel8/8.8/aarch64/codeready-builder/os',
'content/dist/rhel8/8.8/aarch64/codeready-builder/source/SRPMS',
'content/dist/rhel8/8.8/ppc64le/codeready-builder/debug',
'content/dist/rhel8/8.8/ppc64le/codeready-builder/os',
'content/dist/rhel8/8.8/ppc64le/codeready-builder/source/SRPMS',
'content/dist/rhel8/8.8/s390x/codeready-builder/debug',
'content/dist/rhel8/8.8/s390x/codeready-builder/os',
'content/dist/rhel8/8.8/s390x/codeready-builder/source/SRPMS',
'content/dist/rhel8/8.8/x86_64/codeready-builder/debug',
'content/dist/rhel8/8.8/x86_64/codeready-builder/os',
'content/dist/rhel8/8.8/x86_64/codeready-builder/source/SRPMS',
'content/dist/rhel8/8.9/aarch64/codeready-builder/debug',
'content/dist/rhel8/8.9/aarch64/codeready-builder/os',
'content/dist/rhel8/8.9/aarch64/codeready-builder/source/SRPMS',
'content/dist/rhel8/8.9/ppc64le/codeready-builder/debug',
'content/dist/rhel8/8.9/ppc64le/codeready-builder/os',
'content/dist/rhel8/8.9/ppc64le/codeready-builder/source/SRPMS',
'content/dist/rhel8/8.9/s390x/codeready-builder/debug',
'content/dist/rhel8/8.9/s390x/codeready-builder/os',
'content/dist/rhel8/8.9/s390x/codeready-builder/source/SRPMS',
'content/dist/rhel8/8.9/x86_64/codeready-builder/debug',
'content/dist/rhel8/8.9/x86_64/codeready-builder/os',
'content/dist/rhel8/8.9/x86_64/codeready-builder/source/SRPMS',
'content/dist/rhel8/8/aarch64/codeready-builder/debug',
'content/dist/rhel8/8/aarch64/codeready-builder/os',
'content/dist/rhel8/8/aarch64/codeready-builder/source/SRPMS',
'content/dist/rhel8/8/ppc64le/codeready-builder/debug',
'content/dist/rhel8/8/ppc64le/codeready-builder/os',
'content/dist/rhel8/8/ppc64le/codeready-builder/source/SRPMS',
'content/dist/rhel8/8/s390x/codeready-builder/debug',
'content/dist/rhel8/8/s390x/codeready-builder/os',
'content/dist/rhel8/8/s390x/codeready-builder/source/SRPMS',
'content/dist/rhel8/8/x86_64/codeready-builder/debug',
'content/dist/rhel8/8/x86_64/codeready-builder/os',
'content/dist/rhel8/8/x86_64/codeready-builder/source/SRPMS'
],
'pkgs': [
{'reference':'mingw32-expat-2.2.4-5.el8', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'mingw64-expat-2.2.4-5.el8', 'release':'8', 'rpm_spec_vers_cmp':TRUE}
]
}
];
var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);
var flag = 0;
foreach var constraint_array ( constraints ) {
var repo_relative_urls = NULL;
if (!empty_or_null(constraint_array['repo_relative_urls'])) repo_relative_urls = constraint_array['repo_relative_urls'];
foreach var pkg ( constraint_array['pkgs'] ) {
var reference = NULL;
var _release = NULL;
var sp = NULL;
var _cpu = NULL;
var el_string = NULL;
var rpm_spec_vers_cmp = NULL;
var epoch = NULL;
var allowmaj = NULL;
var exists_check = NULL;
var cves = NULL;
if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
if (!empty_or_null(pkg['release'])) _release = 'RHEL' + pkg['release'];
if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
if (reference &&
_release &&
rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
(applicable_repo_urls || (!exists_check || rpm_exists(release:_release, rpm:exists_check))) &&
rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
}
}
if (flag)
{
var extra = NULL;
if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = rpm_report_get() + redhat_report_repo_caveat();
else extra = rpm_report_get();
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : extra
);
exit(0);
}
else
{
var tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'mingw32-expat / mingw64-expat');
}
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