CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
57.6%
The remote CentOS Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2021:2725 advisory.
kernel: use-after-free in show_numa_stats function (CVE-2019-20934)
kernel: mishandles invalid descriptors in drivers/media/usb/gspca/xirlink_cit.c (CVE-2020-11668)
kernel: use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c (CVE-2021-33033)
kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan (CVE-2021-33034)
kernel: size_t-to-int conversion vulnerability in the filesystem layer (CVE-2021-33909)
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2021:2725 and
# CentOS Errata and Security Advisory 2021:2725 respectively.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(151979);
script_version("1.6");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/07/30");
script_cve_id(
"CVE-2019-20934",
"CVE-2020-11668",
"CVE-2021-33033",
"CVE-2021-33034",
"CVE-2021-33909"
);
script_xref(name:"RHSA", value:"2021:2725");
script_xref(name:"IAVA", value:"2021-A-0350");
script_name(english:"CentOS 7 : kernel (CESA-2021:2725)");
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-2021:2725 advisory.
- kernel: use-after-free in show_numa_stats function (CVE-2019-20934)
- kernel: mishandles invalid descriptors in drivers/media/usb/gspca/xirlink_cit.c (CVE-2020-11668)
- kernel: use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c (CVE-2021-33033)
- kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan (CVE-2021-33034)
- kernel: size_t-to-int conversion vulnerability in the filesystem layer (CVE-2021-33909)
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/2021-July/048344.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?53b63f94");
script_set_attribute(attribute:"see_also", value:"https://cwe.mitre.org/data/definitions/20.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/476.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:C/I:C/A:C");
script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-33909");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"exploited_by_malware", value:"true");
script_cwe_id(20, 416, 476, 787);
script_set_attribute(attribute:"vuln_publication_date", value:"2020/04/09");
script_set_attribute(attribute:"patch_publication_date", value:"2021/07/22");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/07/22");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bpftool");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:kernel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:kernel-abi-whitelists");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:kernel-debug");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:kernel-debug-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:kernel-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:kernel-headers");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:kernel-tools");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:kernel-tools-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:kernel-tools-libs-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:perf");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python-perf");
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) 2021 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');
include('rhel.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 (!rhel_check_release(operator: 'ge', os_version: os_ver, rhel_version: '7')) 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':'bpftool-3.10.0-1160.36.2.el7', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-3.10.0-1160.36.2.el7', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-abi-whitelists-3.10.0-1160.36.2.el7', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-debug-3.10.0-1160.36.2.el7', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-debug-devel-3.10.0-1160.36.2.el7', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-devel-3.10.0-1160.36.2.el7', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-headers-3.10.0-1160.36.2.el7', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-3.10.0-1160.36.2.el7', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-libs-3.10.0-1160.36.2.el7', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'kernel-tools-libs-devel-3.10.0-1160.36.2.el7', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'perf-3.10.0-1160.36.2.el7', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE},
{'reference':'python-perf-3.10.0-1160.36.2.el7', 'cpu':'x86_64', 'release':'CentOS-7', 'rpm_spec_vers_cmp':TRUE}
];
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_HOLE,
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, 'bpftool / kernel / kernel-abi-whitelists / etc');
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20934
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11668
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33033
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33034
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33909
www.nessus.org/u?53b63f94
cwe.mitre.org/data/definitions/20.html
cwe.mitre.org/data/definitions/416.html
cwe.mitre.org/data/definitions/476.html
cwe.mitre.org/data/definitions/787.html
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
57.6%