The remote RHEL 7 host is affected by multiple vulnerabilities in grub2, allowing privileged users to load crafted ACPI tables, cause a use-after-free, and execute stack buffer overflow and heap out-of-bounds write attacks
Reporter | Title | Published | Views | Family All 199 |
---|---|---|---|---|
![]() | Debian DSA-4867-1 : grub2 - security update | 3 Mar 202100:00 | – | nessus |
![]() | RHEL 7 : grub2 (RHSA-2021:0704) | 2 Mar 202100:00 | – | nessus |
![]() | SUSE SLES12 Security Update : grub2 (SUSE-SU-2021:0681-1) | 3 Mar 202100:00 | – | nessus |
![]() | RHEL 8 : grub2 (RHSA-2021:0697) | 2 Mar 202100:00 | – | nessus |
![]() | EulerOS 2.0 SP8 : grub2 (EulerOS-SA-2021-1875) | 18 May 202100:00 | – | nessus |
![]() | openSUSE Security Update : grub2 (openSUSE-2021-462) | 24 Mar 202100:00 | – | nessus |
![]() | RHEL 7 : grub2 (RHSA-2021:0700) | 3 Mar 202100:00 | – | nessus |
![]() | RHEL 8 : shim (RHSA-2021:1734) | 19 May 202100:00 | – | nessus |
![]() | Rocky Linux 8 : fwupd (RLSA-2021:2566) | 6 Nov 202300:00 | – | nessus |
![]() | EulerOS Virtualization for ARM 64 3.0.6.0 : grub2 (EulerOS-SA-2021-2001) | 30 Jun 202100:00 | – | nessus |
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2021:0699. The text
# itself is copyright (C) Red Hat, Inc.
##
include('compat.inc');
if (description)
{
script_id(146961);
script_version("1.16");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/11/07");
script_cve_id(
"CVE-2020-14372",
"CVE-2020-25632",
"CVE-2020-25647",
"CVE-2020-27749",
"CVE-2020-27779",
"CVE-2021-20225",
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script_xref(name:"IAVA", value:"2020-A-0349");
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script_set_attribute(attribute:"synopsis", value:
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script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2021:0699 advisory.
The grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and
customizable boot loader with modular architecture. The packages support a variety of kernel formats, file
systems, computer architectures, and hardware devices.
Security Fix(es):
* grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled
(CVE-2020-14372)
* grub2: Use-after-free in rmmod command (CVE-2020-25632)
* grub2: Out-of-bounds write in grub_usb_device_initialize() (CVE-2020-25647)
* grub2: Stack buffer overflow in grub_parser_split_cmdline() (CVE-2020-27749)
* grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled
(CVE-2020-27779)
* grub2: Heap out-of-bounds write in short form option parser (CVE-2021-20225)
* grub2: Heap out-of-bounds write due to miscalculation of space required for quoting (CVE-2021-20233)
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.
Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
# https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_0699.json
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5165fa2b");
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/security/vulnerabilities/RHSB-2021-003");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2021:0699");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1873150");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1879577");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1886936");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1899966");
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script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1926263");
script_set_attribute(attribute:"solution", value:
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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");
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script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
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script_cwe_id(121, 184, 285, 416, 787);
script_set_attribute(attribute:"vendor_severity", value:"Moderate");
script_set_attribute(attribute:"vuln_publication_date", value:"2020/07/30");
script_set_attribute(attribute:"patch_publication_date", value:"2021/03/02");
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script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-pc");
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script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:grub2-ppc64");
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script_set_attribute(attribute:"generated_plugin", value:"current");
script_set_attribute(attribute:"stig_severity", value:"II");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Red Hat Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2021-2024 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");
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{'reference':'grub2-ppc64le-2.02-0.87.el7_9.2', 'cpu':'ppc64le', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-ppc64le-modules-2.02-0.87.el7_9.2', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-2.02-0.87.el7_9.2', 'cpu':'ppc64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-2.02-0.87.el7_9.2', 'cpu':'ppc64le', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-2.02-0.87.el7_9.2', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-extra-2.02-0.87.el7_9.2', 'cpu':'ppc64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-extra-2.02-0.87.el7_9.2', 'cpu':'ppc64le', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-extra-2.02-0.87.el7_9.2', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-minimal-2.02-0.87.el7_9.2', 'cpu':'ppc64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-minimal-2.02-0.87.el7_9.2', 'cpu':'ppc64le', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
{'reference':'grub2-tools-minimal-2.02-0.87.el7_9.2', 'cpu':'x86_64', 'release':'7', '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 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, 'grub2 / grub2-common / grub2-efi-aa64-modules / grub2-efi-ia32 / etc');
}
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