Debian DLA-2395-1 : libvirt security update - Nessus

Medium Plugin ID: 141137

This page contains detailed information about the Debian DLA-2395-1 : libvirt security update 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: 141137
Name: Debian DLA-2395-1 : libvirt security update
Filename: debian_DLA-2395.nasl
Vulnerability Published: 2020-10-06
This Plugin Published: 2020-10-05
Last Modification Time: 2020-10-13
Plugin Version: 1.3
Plugin Type: local
Plugin Family: Debian Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/Debian/dpkg-l, Host/Debian/release, Host/local_checks_enabled

Vulnerability Information

Synopsis

The remote Debian host is missing a security update.

Description

A double free vulnerability was discovered in libvirt, a toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes).

For Debian 9 stretch, this problem has been fixed in version 3.0.0-4+deb9u5.

We recommend that you upgrade your libvirt packages.

For the detailed security status of libvirt please refer to its security tracker page at: https://security-tracker.debian.org/tracker/libvirt

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Upgrade 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 Debian DLA-2395-1 : libvirt security update 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 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 Debian Security Advisory DLA-2395-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(141137);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/10/13");

  script_cve_id("CVE-2020-25637");

  script_name(english:"Debian DLA-2395-1 : libvirt security update");
  script_summary(english:"Checks dpkg output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description",
    value:
"A double free vulnerability was discovered in libvirt, a toolkit to
interact with the virtualization capabilities of recent versions of
Linux (and other OSes).

For Debian 9 stretch, this problem has been fixed in version
3.0.0-4+deb9u5.

We recommend that you upgrade your libvirt packages.

For the detailed security status of libvirt please refer to its
security tracker page at:
https://security-tracker.debian.org/tracker/libvirt

NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA security advisory. Tenable has attempted
to automatically clean and format it as much as possible without
introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://lists.debian.org/debian-lts-announce/2020/10/msg00004.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/stretch/libvirt"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/source-package/libvirt"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade 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:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnss-libvirt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libvirt-clients");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libvirt-daemon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libvirt-daemon-system");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libvirt-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libvirt-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libvirt-sanlock");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libvirt0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/10/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/10/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/10/05");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"9.0", prefix:"libnss-libvirt", reference:"3.0.0-4+deb9u5")) flag++;
if (deb_check(release:"9.0", prefix:"libvirt-clients", reference:"3.0.0-4+deb9u5")) flag++;
if (deb_check(release:"9.0", prefix:"libvirt-daemon", reference:"3.0.0-4+deb9u5")) flag++;
if (deb_check(release:"9.0", prefix:"libvirt-daemon-system", reference:"3.0.0-4+deb9u5")) flag++;
if (deb_check(release:"9.0", prefix:"libvirt-dev", reference:"3.0.0-4+deb9u5")) flag++;
if (deb_check(release:"9.0", prefix:"libvirt-doc", reference:"3.0.0-4+deb9u5")) flag++;
if (deb_check(release:"9.0", prefix:"libvirt-sanlock", reference:"3.0.0-4+deb9u5")) flag++;
if (deb_check(release:"9.0", prefix:"libvirt0", reference:"3.0.0-4+deb9u5")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get());
  else security_hole(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/debian_DLA-2395.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\debian_DLA-2395.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/debian_DLA-2395.nasl

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How to Run

Here is how to run the Debian DLA-2395-1 : libvirt security update 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 Debian Local Security Checks plugin family.
On the right side table select Debian DLA-2395-1 : libvirt security update plugin ID 141137.
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 debian_DLA-2395.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a debian_DLA-2395.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - debian_DLA-2395.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 debian_DLA-2395.nasl -t <IP/HOST>

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References

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)
143055 - CentOS 7 : libvirt (CESA-2020:5040)
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 debian_DLA-2395.nasl version 1.3. For more plugins, visit the Nessus Plugin Library.

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Debian DLA-2395-1 : libvirt security update - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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