CentOS 7 : libvirt (CESA-2020:5040) - Nessus

Medium Plugin ID: 143055

This page contains detailed information about the CentOS 7 : libvirt (CESA-2020:5040) Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

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Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 143055
Name: CentOS 7 : libvirt (CESA-2020:5040)
Filename: centos_RHSA-2020-5040.nasl
Vulnerability Published: 2020-10-06
This Plugin Published: 2020-11-18
Last Modification Time: 2020-11-30
Plugin Version: 1.4
Plugin Type: local
Plugin Family: CentOS Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/CentOS/release, Host/CentOS/rpm-list, Host/cpu, Host/local_checks_enabled

Vulnerability Information

Synopsis

The remote CentOS Linux host is missing a security update.

Description

The remote CentOS Linux 7 host has packages installed that are affected by a vulnerability as referenced in the CESA-2020:5040 advisory.

- libvirt: double free in qemuAgentGetInterfaces() in qemu_agent.c (CVE-2020-25637)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

Public Exploits

Target Network Port(s): N/A
Target Asset(s): N/A
Exploit Available: True (GitHub)
Exploit Ease: Exploits (PoCs) are available

Here's the list of publicly known exploits and PoCs for verifying the CentOS 7 : libvirt (CESA-2020:5040) vulnerability:

GitHub: https://github.com/brahmiboudjema/CVE-2020-25637-libvirt-double-free
[CVE-2020-25637: Double Free]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

CVSS Score Source [?]: CVE-2020-25637
CVSS V2 Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C/E:U/RL:OF/RC:C

CVSS Base Score:	7.2 (High)
Impact Subscore:	10.0
Exploitability Subscore:	3.9
CVSS Temporal Score:	5.3 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	5.3 (Medium)

CVSS V3 Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

CVSS Base Score:	6.7 (Medium)
Impact Subscore:	5.9
Exploitability Subscore:	0.8
CVSS Temporal Score:	5.8 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	5.8 (Medium)

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Plugin Source

##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2020:5040 and
# CentOS Errata and Security Advisory 2020:5040 respectively.
##

include('compat.inc');

if (description)
{
  script_id(143055);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/11/30");

  script_cve_id("CVE-2020-25637");
  script_xref(name:"RHSA", value:"2020:5040");

  script_name(english:"CentOS 7 : libvirt (CESA-2020:5040)");
  script_summary(english:"Checks the rpm output for the updated packages");

  script_set_attribute(attribute:"synopsis", value:
"The remote CentOS Linux host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote CentOS Linux 7 host has packages installed that are affected by a vulnerability as referenced in the
CESA-2020:5040 advisory.

  - libvirt: double free in qemuAgentGetInterfaces() in qemu_agent.c (CVE-2020-25637)

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-November/035841.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?583345b5");
  script_set_attribute(attribute:"see_also", value:"https://cwe.mitre.org/data/definitions/416.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:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-25637");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(416);

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/10/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/11/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/11/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-admin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-bash-completion");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-config-network");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-config-nwfilter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-driver-interface");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-driver-lxc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-driver-network");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-driver-nodedev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-driver-nwfilter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-driver-qemu");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-driver-secret");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-driver-storage");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-driver-storage-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-driver-storage-disk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-driver-storage-gluster");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-driver-storage-iscsi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-driver-storage-logical");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-driver-storage-mpath");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-driver-storage-rbd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-driver-storage-scsi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-daemon-lxc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-docs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-lock-sanlock");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-login-shell");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libvirt-nss");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CentOS Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2020 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':'libvirt-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-admin-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-bash-completion-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-client-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'i686', 'release':'CentOS-7'},
    {'reference':'libvirt-client-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-config-network-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-config-nwfilter-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-driver-interface-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-driver-lxc-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-driver-network-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-driver-nodedev-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-driver-nwfilter-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-driver-qemu-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-driver-secret-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-driver-storage-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-driver-storage-core-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-driver-storage-disk-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-driver-storage-gluster-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-driver-storage-iscsi-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-driver-storage-logical-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-driver-storage-mpath-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-driver-storage-rbd-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-driver-storage-scsi-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-kvm-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-daemon-lxc-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-devel-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'i686', 'release':'CentOS-7'},
    {'reference':'libvirt-devel-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-docs-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-libs-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'i686', 'release':'CentOS-7'},
    {'reference':'libvirt-libs-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-lock-sanlock-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-login-shell-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'x86_64', 'release':'CentOS-7'},
    {'reference':'libvirt-nss-4.5.0-36.el7_9.3', 'sp':'9', 'cpu':'i686', 'release':'CentOS-7'},
    {'reference':'libvirt-nss-4.5.0-36.el7_9.3', '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_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, 'libvirt / libvirt-admin / libvirt-bash-completion / etc');
}

The latest version of this script can be found in these locations depending on your platform:

Linux / Unix:
/opt/nessus/lib/nessus/plugins/centos_RHSA-2020-5040.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\centos_RHSA-2020-5040.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/centos_RHSA-2020-5040.nasl

Go back to menu.

How to Run

Here is how to run the CentOS 7 : libvirt (CESA-2020:5040) as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

Click to start a New Scan.
Select Advanced Scan.
Navigate to the Plugins tab.
On the top right corner click to Disable All plugins.
On the left side table select CentOS Local Security Checks plugin family.
On the right side table select CentOS 7 : libvirt (CESA-2020:5040) plugin ID 143055.
Specify the target on the Settings tab and click to Save the scan.
Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl centos_RHSA-2020-5040.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a centos_RHSA-2020-5040.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - centos_RHSA-2020-5040.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state centos_RHSA-2020-5040.nasl -t <IP/HOST>

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References

RHSA | Red Hat Security Advisory:

2020:5040

CWE | Common Weakness Enumeration:

CWE-416 (Weakness) Use After Free

See also:

Similar and related Nessus plugins:

143577 - Amazon Linux 2 : libvirt (ALAS-2020-1569)
157696 - AlmaLinux 8 : virt:rhel and virt-devel:rhel (ALSA-2021:1762)
149772 - CentOS 8 : virt:rhel and virt-devel:rhel (CESA-2021:1762)
141137 - Debian DLA-2395-1 : libvirt security update
144728 - EulerOS Virtualization for ARM 64 3.0.2.0 : libvirt (EulerOS-SA-2021-1045)
147562 - EulerOS Virtualization 3.0.6.6 : libvirt (EulerOS-SA-2021-1456)
147104 - EulerOS Virtualization for ARM 64 3.0.6.0 : libvirt (EulerOS-SA-2021-1526)
147481 - EulerOS Virtualization 2.9.1 : libvirt (EulerOS-SA-2021-1631)
147678 - EulerOS Virtualization 2.9.0 : libvirt (EulerOS-SA-2021-1666)
142183 - openSUSE Security Update : libvirt (openSUSE-2020-1777)
142188 - openSUSE Security Update : libvirt (openSUSE-2020-1778)
142784 - Oracle Linux 7 : libvirt (ELSA-2020-5040)
146198 - Oracle Linux 7 : libvirt (ELSA-2020-5961)
155325 - Oracle Linux 8 : virt:ol / and / virt-devel:rhel (ELSA-2021-1762)
142700 - RHEL 7 : libvirt (RHSA-2020:5040)
142982 - RHEL 8 : virt:8.2 and virt-devel:8.2 (RHSA-2020:5111)
149669 - RHEL 8 : virt:rhel and virt-devel:rhel (RHSA-2021:1762)
142821 - Scientific Linux Security Update : libvirt on SL7.x i686/x86_64 (2020:5040)
143850 - SUSE SLES15 Security Update : libvirt (SUSE-SU-2020:2969-1)
143884 - SUSE SLED15 / SLES15 Security Update : libvirt (SUSE-SU-2020:2970-1)
143649 - SUSE SLED15 / SLES15 Security Update : libvirt (SUSE-SU-2020:3037-1)
143827 - SUSE SLES12 Security Update : libvirt (SUSE-SU-2020:3038-1)
143759 - SUSE SLES12 Security Update : libvirt (SUSE-SU-2020:3039-1)
143635 - SUSE SLES12 Security Update : libvirt (SUSE-SU-2020:3095-1)
143851 - SUSE SLES12 Security Update : libvirt (SUSE-SU-2020:3143-1)
160444 - Ubuntu 18.04 LTS / 20.04 LTS / 21.10 : libvirt vulnerabilities (USN-5399-1)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file centos_RHSA-2020-5040.nasl version 1.4. For more plugins, visit the Nessus Plugin Library.

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CentOS 7 : libvirt (CESA-2020:5040) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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