The remote CentOS Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2020:3217 advisory.
grub2: Crafted grub.cfg file can lead to arbitrary code execution during boot process (CVE-2020-10713)
grub2: grub_malloc does not validate allocation size allowing for arithmetic overflow and subsequent heap- based buffer overflow (CVE-2020-14308)
grub2: Integer overflow in grub_squash_read_symlink may lead to heap-based buffer overflow (CVE-2020-14309)
grub2: Integer overflow read_section_as_string may lead to heap-based buffer overflow (CVE-2020-14310)
grub2: Integer overflow in grub_ext2_read_link leads to heap-based buffer overflow (CVE-2020-14311)
grub2: Fail kernel validation without shim protocol (CVE-2020-15705)
grub2: Use-after-free redefining a function whilst the same function is already executing (CVE-2020-15706)
grub2: Integer overflow in initrd size handling (CVE-2020-15707)
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2020:3217 and
# CentOS Errata and Security Advisory 2020:3217 respectively.
##
include('compat.inc');
if (description)
{
script_id(139236);
script_version("1.8");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/27");
script_cve_id(
"CVE-2020-10713",
"CVE-2020-14308",
"CVE-2020-14309",
"CVE-2020-14310",
"CVE-2020-14311",
"CVE-2020-15705",
"CVE-2020-15706",
"CVE-2020-15707"
);
script_xref(name:"RHSA", value:"2020:3217");
script_xref(name:"IAVA", value:"2020-A-0349");
script_xref(name:"CEA-ID", value:"CEA-2020-0061");
script_name(english:"CentOS 7 : grub2 (CESA-2020:3217)");
script_set_attribute(attribute:"synopsis", value:
"The remote CentOS Linux host is missing one or more security updates.");
script_set_attribute(attribute:"description", value:
"The remote CentOS Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the
CESA-2020:3217 advisory.
- grub2: Crafted grub.cfg file can lead to arbitrary code execution during boot process (CVE-2020-10713)
- grub2: grub_malloc does not validate allocation size allowing for arithmetic overflow and subsequent heap-
based buffer overflow (CVE-2020-14308)
- grub2: Integer overflow in grub_squash_read_symlink may lead to heap-based buffer overflow
(CVE-2020-14309)
- grub2: Integer overflow read_section_as_string may lead to heap-based buffer overflow (CVE-2020-14310)
- grub2: Integer overflow in grub_ext2_read_link leads to heap-based buffer overflow (CVE-2020-14311)
- grub2: Fail kernel validation without shim protocol (CVE-2020-15705)
- grub2: Use-after-free redefining a function whilst the same function is already executing (CVE-2020-15706)
- grub2: Integer overflow in initrd size handling (CVE-2020-15707)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
# https://lists.centos.org/pipermail/centos-announce/2020-July/035781.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c42bb45f");
# https://lists.centos.org/pipermail/centos-announce/2020-July/035783.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c580a639");
# https://lists.centos.org/pipermail/centos-announce/2020-July/035784.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7da4e0c5");
script_set_attribute(attribute:"see_also", value:"https://cwe.mitre.org/data/definitions/78.html");
script_set_attribute(attribute:"see_also", value:"https://cwe.mitre.org/data/definitions/122.html");
script_set_attribute(attribute:"see_also", value:"https://cwe.mitre.org/data/definitions/190.html");
script_set_attribute(attribute:"see_also", value:"https://cwe.mitre.org/data/definitions/416.html");
script_set_attribute(attribute:"see_also", value:"https://cwe.mitre.org/data/definitions/440.html");
script_set_attribute(attribute:"see_also", value:"https://cwe.mitre.org/data/definitions/787.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:P/A:P");
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:H/UI:N/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-2020-14309");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2020-10713");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_cwe_id(78, 122, 190, 416, 440, 787);
script_set_attribute(attribute:"vuln_publication_date", value:"2020/07/29");
script_set_attribute(attribute:"patch_publication_date", value:"2020/07/30");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/07/31");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-common");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-efi-ia32");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-efi-ia32-cdboot");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-efi-ia32-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-efi-x64");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-efi-x64-cdboot");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-efi-x64-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-i386-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-pc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-pc-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-tools");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-tools-extra");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:grub2-tools-minimal");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:mokutil");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:shim-ia32");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:shim-unsigned-ia32");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:shim-unsigned-x64");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:shim-x64");
script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");
script_set_attribute(attribute:"stig_severity", value:"II");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"CentOS 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");
script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/rpm-list", "Host/cpu");
exit(0);
}
include('audit.inc');
include('global_settings.inc');
include('rpm.inc');
if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item('Host/CentOS/release');
if (isnull(release) || 'CentOS' >!< release) audit(AUDIT_OS_NOT, 'CentOS');
os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'CentOS');
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'CentOS 7.x', 'CentOS ' + os_ver);
if (!get_kb_item('Host/CentOS/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'CentOS', cpu);
pkgs = [
{'reference':'grub2-2.02-0.86.el7.centos', 'cpu':'x86_64', 'release':'CentOS-7'},
{'reference':'grub2-common-2.02-0.86.el7.centos', 'release':'CentOS-7'},
{'reference':'grub2-efi-ia32-2.02-0.86.el7.centos', 'cpu':'x86_64', 'release':'CentOS-7'},
{'reference':'grub2-efi-ia32-cdboot-2.02-0.86.el7.centos', 'cpu':'x86_64', 'release':'CentOS-7'},
{'reference':'grub2-efi-ia32-modules-2.02-0.86.el7.centos', 'release':'CentOS-7'},
{'reference':'grub2-efi-x64-2.02-0.86.el7.centos', 'cpu':'x86_64', 'release':'CentOS-7'},
{'reference':'grub2-efi-x64-cdboot-2.02-0.86.el7.centos', 'cpu':'x86_64', 'release':'CentOS-7'},
{'reference':'grub2-efi-x64-modules-2.02-0.86.el7.centos', 'release':'CentOS-7'},
{'reference':'grub2-i386-modules-2.02-0.86.el7.centos', 'release':'CentOS-7'},
{'reference':'grub2-pc-2.02-0.86.el7.centos', 'cpu':'x86_64', 'release':'CentOS-7'},
{'reference':'grub2-pc-modules-2.02-0.86.el7.centos', 'release':'CentOS-7'},
{'reference':'grub2-tools-2.02-0.86.el7.centos', 'cpu':'x86_64', 'release':'CentOS-7'},
{'reference':'grub2-tools-extra-2.02-0.86.el7.centos', 'cpu':'x86_64', 'release':'CentOS-7'},
{'reference':'grub2-tools-minimal-2.02-0.86.el7.centos', 'cpu':'x86_64', 'release':'CentOS-7'},
{'reference':'mokutil-15-7.el7_9', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
{'reference':'shim-ia32-15-7.el7_9', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
{'reference':'shim-unsigned-ia32-15-7.el7_9', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
{'reference':'shim-unsigned-x64-15-7.el7_9', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
{'reference':'shim-x64-15-7.el7_9', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'}
];
flag = 0;
foreach package_array ( pkgs ) {
reference = NULL;
release = NULL;
sp = NULL;
cpu = NULL;
el_string = NULL;
rpm_spec_vers_cmp = NULL;
epoch = NULL;
allowmaj = NULL;
if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
if (!empty_or_null(package_array['release'])) release = 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 (reference && release) {
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_WARNING,
extra : rpm_report_get()
);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'grub2 / grub2-common / grub2-efi-ia32 / etc');
}
Vendor | Product | Version | CPE |
---|---|---|---|
centos | centos | grub2 | p-cpe:/a:centos:centos:grub2 |
centos | centos | grub2-common | p-cpe:/a:centos:centos:grub2-common |
centos | centos | grub2-efi-ia32 | p-cpe:/a:centos:centos:grub2-efi-ia32 |
centos | centos | grub2-efi-ia32-cdboot | p-cpe:/a:centos:centos:grub2-efi-ia32-cdboot |
centos | centos | grub2-efi-ia32-modules | p-cpe:/a:centos:centos:grub2-efi-ia32-modules |
centos | centos | grub2-efi-x64 | p-cpe:/a:centos:centos:grub2-efi-x64 |
centos | centos | grub2-efi-x64-cdboot | p-cpe:/a:centos:centos:grub2-efi-x64-cdboot |
centos | centos | grub2-efi-x64-modules | p-cpe:/a:centos:centos:grub2-efi-x64-modules |
centos | centos | grub2-i386-modules | p-cpe:/a:centos:centos:grub2-i386-modules |
centos | centos | grub2-pc | p-cpe:/a:centos:centos:grub2-pc |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-10713
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14308
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14309
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14310
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14311
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15705
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15706
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15707
www.nessus.org/u?7da4e0c5
www.nessus.org/u?c42bb45f
www.nessus.org/u?c580a639
cwe.mitre.org/data/definitions/122.html
cwe.mitre.org/data/definitions/190.html
cwe.mitre.org/data/definitions/416.html
cwe.mitre.org/data/definitions/440.html
cwe.mitre.org/data/definitions/78.html
cwe.mitre.org/data/definitions/787.html