CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
32.6%
The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2022:8978 advisory.
grub2: Buffer overflow in grub_font_construct_glyph() can lead to out-of-bound write and possible secure boot bypass (CVE-2022-2601)
grub2: Heap based out-of-bounds write when redering certain unicode sequences (CVE-2022-3775)
Note that Nessus has not tested for these issues but has instead relied only on the application’s self-reported version number.
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2022:8978. The text
# itself is copyright (C) Red Hat, Inc.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(168710);
script_version("1.7");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/28");
script_cve_id("CVE-2022-2601", "CVE-2022-3775");
script_xref(name:"RHSA", value:"2022:8978");
script_name(english:"RHEL 9 : grub2 (RHSA-2022:8978)");
script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for grub2.");
script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2022:8978 advisory.
- grub2: Buffer overflow in grub_font_construct_glyph() can lead to out-of-bound write and possible secure
boot bypass (CVE-2022-2601)
- grub2: Heap based out-of-bounds write when redering certain unicode sequences (CVE-2022-3775)
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
# https://access.redhat.com/security/data/csaf/v2/advisories/2022/rhsa-2022_8978.json
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b77a85ed");
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-2022:8978");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2112975");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2138880");
script_set_attribute(attribute:"solution", value:
"Update the RHEL grub2 package based on the guidance in RHSA-2022:8978.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/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:L/AC:L/PR:N/UI:R/S:C/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-2022-2601");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_cwe_id(787);
script_set_attribute(attribute:"vendor_severity", value:"Moderate");
script_set_attribute(attribute:"vuln_publication_date", value:"2022/11/15");
script_set_attribute(attribute:"patch_publication_date", value:"2022/12/13");
script_set_attribute(attribute:"plugin_publication_date", value:"2022/12/13");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_eus:9.0");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-common");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-efi-aa64");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-efi-aa64-cdboot");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-efi-aa64-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-efi-x64");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-efi-x64-cdboot");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-efi-x64-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-pc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-pc-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-ppc64le");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-ppc64le-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-tools");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-tools-efi");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-tools-extra");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-tools-minimal");
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) 2022-2024 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: 'eq', os_version: os_ver, rhel_version: '9.0')) audit(AUDIT_OS_NOT, 'Red Hat 9.0', '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/e4s/rhel9/9.0/aarch64/baseos/debug',
'content/e4s/rhel9/9.0/aarch64/baseos/os',
'content/e4s/rhel9/9.0/aarch64/baseos/source/SRPMS',
'content/e4s/rhel9/9.0/ppc64le/baseos/debug',
'content/e4s/rhel9/9.0/ppc64le/baseos/os',
'content/e4s/rhel9/9.0/ppc64le/baseos/source/SRPMS',
'content/e4s/rhel9/9.0/x86_64/baseos/debug',
'content/e4s/rhel9/9.0/x86_64/baseos/os',
'content/e4s/rhel9/9.0/x86_64/baseos/source/SRPMS',
'content/eus/rhel9/9.0/aarch64/baseos/debug',
'content/eus/rhel9/9.0/aarch64/baseos/os',
'content/eus/rhel9/9.0/aarch64/baseos/source/SRPMS',
'content/eus/rhel9/9.0/ppc64le/baseos/debug',
'content/eus/rhel9/9.0/ppc64le/baseos/os',
'content/eus/rhel9/9.0/ppc64le/baseos/source/SRPMS',
'content/eus/rhel9/9.0/x86_64/baseos/debug',
'content/eus/rhel9/9.0/x86_64/baseos/os',
'content/eus/rhel9/9.0/x86_64/baseos/source/SRPMS'
],
'pkgs': [
{'reference':'grub2-common-2.06-27.el9_0.12', 'sp':'0', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-efi-aa64-2.06-27.el9_0.12', 'sp':'0', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-efi-aa64-cdboot-2.06-27.el9_0.12', 'sp':'0', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-efi-aa64-modules-2.06-27.el9_0.12', 'sp':'0', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-efi-x64-2.06-27.el9_0.12', 'sp':'0', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-efi-x64-cdboot-2.06-27.el9_0.12', 'sp':'0', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-efi-x64-modules-2.06-27.el9_0.12', 'sp':'0', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-pc-2.06-27.el9_0.12', 'sp':'0', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-pc-modules-2.06-27.el9_0.12', 'sp':'0', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-ppc64le-2.06-27.el9_0.12', 'sp':'0', 'cpu':'ppc64le', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-ppc64le-modules-2.06-27.el9_0.12', 'sp':'0', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-2.06-27.el9_0.12', 'sp':'0', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-2.06-27.el9_0.12', 'sp':'0', 'cpu':'ppc64le', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-2.06-27.el9_0.12', 'sp':'0', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-efi-2.06-27.el9_0.12', 'sp':'0', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-extra-2.06-27.el9_0.12', 'sp':'0', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-extra-2.06-27.el9_0.12', 'sp':'0', 'cpu':'ppc64le', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-extra-2.06-27.el9_0.12', 'sp':'0', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-minimal-2.06-27.el9_0.12', 'sp':'0', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-minimal-2.06-27.el9_0.12', 'sp':'0', 'cpu':'ppc64le', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-minimal-2.06-27.el9_0.12', 'sp':'0', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'}
]
}
];
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 subscription_caveat = '\n' +
'NOTE: This vulnerability check contains fixes that apply to\n' +
'packages only available in the Red Hat Enterprise Linux\n' +
'Extended Update Support repository.\n' +
'Access to this repository requires a paid RHEL subscription.\n';
var extra = NULL;
if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = subscription_caveat + rpm_report_get() + redhat_report_repo_caveat();
else extra = subscription_caveat + 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, 'grub2-common / grub2-efi-aa64 / grub2-efi-aa64-cdboot / etc');
}
Vendor | Product | Version | CPE |
---|---|---|---|
redhat | rhel_eus | 9.0 | cpe:/o:redhat:rhel_eus:9.0 |
redhat | enterprise_linux | grub2 | p-cpe:/a:redhat:enterprise_linux:grub2 |
redhat | enterprise_linux | grub2-common | p-cpe:/a:redhat:enterprise_linux:grub2-common |
redhat | enterprise_linux | grub2-efi-aa64 | p-cpe:/a:redhat:enterprise_linux:grub2-efi-aa64 |
redhat | enterprise_linux | grub2-efi-aa64-cdboot | p-cpe:/a:redhat:enterprise_linux:grub2-efi-aa64-cdboot |
redhat | enterprise_linux | grub2-efi-aa64-modules | p-cpe:/a:redhat:enterprise_linux:grub2-efi-aa64-modules |
redhat | enterprise_linux | grub2-efi-x64 | p-cpe:/a:redhat:enterprise_linux:grub2-efi-x64 |
redhat | enterprise_linux | grub2-efi-x64-cdboot | p-cpe:/a:redhat:enterprise_linux:grub2-efi-x64-cdboot |
redhat | enterprise_linux | grub2-efi-x64-modules | p-cpe:/a:redhat:enterprise_linux:grub2-efi-x64-modules |
redhat | enterprise_linux | grub2-pc | p-cpe:/a:redhat:enterprise_linux:grub2-pc |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-2601
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-3775
www.nessus.org/u?b77a85ed
access.redhat.com/errata/RHSA-2022:8978
access.redhat.com/security/updates/classification/#moderate
bugzilla.redhat.com/show_bug.cgi?id=2112975
bugzilla.redhat.com/show_bug.cgi?id=2138880
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
32.6%