CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS
Percentile
15.5%
The remote AlmaLinux 8 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2022:2110 advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# AlmaLinux Security Advisory ALSA-2022:2110.
##
include('compat.inc');
if (description)
{
script_id(161091);
script_version("1.2");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/05/12");
script_cve_id("CVE-2021-3981");
script_xref(name:"ALSA", value:"2022:2110");
script_name(english:"AlmaLinux 8 : grub2 (ALSA-2022:2110)");
script_set_attribute(attribute:"synopsis", value:
"The remote AlmaLinux host is missing a security update.");
script_set_attribute(attribute:"description", value:
"The remote AlmaLinux 8 host has packages installed that are affected by a vulnerability as referenced in the
ALSA-2022:2110 advisory.
- A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong
permission set allowing non privileged users to read its content. This represents a low severity
confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg.
This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no
version with the fix is currently released. (CVE-2021-3981)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
script_set_attribute(attribute:"see_also", value:"https://errata.almalinux.org/8/ALSA-2022-2110.html");
script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:N");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-3981");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"vuln_publication_date", value:"2022/03/10");
script_set_attribute(attribute:"patch_publication_date", value:"2022/05/10");
script_set_attribute(attribute:"plugin_publication_date", value:"2022/05/12");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:grub2-common");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:grub2-efi-aa64");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:grub2-efi-aa64-cdboot");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:grub2-efi-aa64-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:grub2-efi-ia32");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:grub2-efi-ia32-cdboot");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:grub2-efi-ia32-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:grub2-efi-x64");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:grub2-efi-x64-cdboot");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:grub2-efi-x64-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:grub2-pc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:grub2-pc-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:grub2-ppc64le-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:grub2-tools");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:grub2-tools-efi");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:grub2-tools-extra");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:grub2-tools-minimal");
script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Alma Linux Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2022 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/AlmaLinux/release", "Host/AlmaLinux/rpm-list", "Host/cpu");
exit(0);
}
include('rpm.inc');
if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var release = get_kb_item('Host/AlmaLinux/release');
if (isnull(release) || 'AlmaLinux' >!< release) audit(AUDIT_OS_NOT, 'AlmaLinux');
var os_ver = pregmatch(pattern: "AlmaLinux release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'AlmaLinux');
var os_ver = os_ver[1];
if (! preg(pattern:"^8([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'AlmaLinux 8.x', 'AlmaLinux ' + os_ver);
if (!get_kb_item('Host/AlmaLinux/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'AlmaLinux', cpu);
var pkgs = [
{'reference':'grub2-common-2.02-123.el8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-efi-aa64-2.02-123.el8.alma', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-efi-aa64-cdboot-2.02-123.el8.alma', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-efi-aa64-modules-2.02-123.el8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-efi-ia32-2.02-123.el8.alma', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-efi-ia32-cdboot-2.02-123.el8.alma', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-efi-ia32-modules-2.02-123.el8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-efi-x64-2.02-123.el8.alma', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-efi-x64-cdboot-2.02-123.el8.alma', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-efi-x64-modules-2.02-123.el8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-pc-2.02-123.el8.alma', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-pc-modules-2.02-123.el8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-ppc64le-modules-2.02-123.el8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-2.02-123.el8.alma', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-2.02-123.el8.alma', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-efi-2.02-123.el8.alma', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-extra-2.02-123.el8.alma', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-extra-2.02-123.el8.alma', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-minimal-2.02-123.el8.alma', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-minimal-2.02-123.el8.alma', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'}
];
var flag = 0;
foreach var package_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;
if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
if (!empty_or_null(package_array['release'])) release = 'Alma-' + package_array['release'];
if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu'];
if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
if (reference && release && (!exists_check || rpm_exists(release:release, rpm:exists_check))) {
if (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)) flag++;
}
}
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_NOTE,
extra : rpm_report_get()
);
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 |
---|---|---|---|
alma | linux | grub2-efi-ia32-modules | p-cpe:/a:alma:linux:grub2-efi-ia32-modules |
alma | linux | grub2-efi-x64-modules | p-cpe:/a:alma:linux:grub2-efi-x64-modules |
alma | linux | grub2-pc | p-cpe:/a:alma:linux:grub2-pc |
alma | linux | grub2-efi-aa64-cdboot | p-cpe:/a:alma:linux:grub2-efi-aa64-cdboot |
alma | linux | grub2-tools | p-cpe:/a:alma:linux:grub2-tools |
alma | linux | grub2-efi-aa64-modules | p-cpe:/a:alma:linux:grub2-efi-aa64-modules |
alma | linux | grub2-tools-minimal | p-cpe:/a:alma:linux:grub2-tools-minimal |
alma | linux | grub2-efi-x64-cdboot | p-cpe:/a:alma:linux:grub2-efi-x64-cdboot |
alma | linux | grub2-efi-ia32-cdboot | p-cpe:/a:alma:linux:grub2-efi-ia32-cdboot |
alma | linux | grub2-ppc64le-modules | p-cpe:/a:alma:linux:grub2-ppc64le-modules |
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS
Percentile
15.5%