SUSE SLES11 Security Update : dnsmasq (SUSE-SU-2022:14941-1) - Nessus

Medium Plugin ID: 160068

This page contains detailed information about the SUSE SLES11 Security Update : dnsmasq (SUSE-SU-2022:14941-1) 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: 160068
Name: SUSE SLES11 Security Update : dnsmasq (SUSE-SU-2022:14941-1)
Filename: suse_SU-2022-14941-1.nasl
Vulnerability Published: 2021-04-08
This Plugin Published: 2022-04-22
Last Modification Time: 2022-04-22
Plugin Version: 1.2
Plugin Type: local
Plugin Family: SuSE Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/cpu, Host/local_checks_enabled, Host/SuSE/release, Host/SuSE/rpm-list

Vulnerability Information

Severity: Medium
Vulnerability Published: 2021-04-08
Patch Published: 2022-04-21
CVE [?]: CVE-2021-3448, CVE-2022-0934
CPE [?]: cpe:/o:novell:suse_linux:11, p-cpe:/a:novell:suse_linux:dnsmasq

Synopsis

The remote SUSE host is missing one or more security updates.

Description

The remote SUSE Linux SLES11 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:14941-1 advisory.

- A flaw was found in dnsmasq in versions before 2.85. When configured to use a specific server for a given network interface, dnsmasq uses a fixed port while forwarding queries. An attacker on the network, able to find the outgoing port used by dnsmasq, only needs to guess the random transmission ID to forge a reply and get it accepted by dnsmasq. This flaw makes a DNS Cache Poisoning attack much easier. The highest threat from this vulnerability is to data integrity. (CVE-2021-3448)

- Petr Menk reports: Possible vulnerability [...] found in latest dnsmasq. It [was] found with help of oss-fuzz Google project by me and short after that independently also by Richard Johnson of Trellix Threat Labs. It is affected only by DHCPv6 requests, which could be crafted to modify already freed memory. [...] We think it might be triggered remotely, but we do not think it could be used to execute remote code. (CVE-2022-0934)

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

Solution

Update the affected dnsmasq package.

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 SUSE SLES11 Security Update : dnsmasq (SUSE-SU-2022:14941-1) vulnerability:

GitHub: https://github.com/JamesGeeee/CVE-2021-3448
[CVE-2021-3448: PoC for exploiting CVE-2021-3448]

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-2021-3448
CVSS V2 Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N/E:U/RL:OF/RC:C

CVSS Base Score:	4.3 (Medium)
Impact Subscore:	2.9
Exploitability Subscore:	8.6
CVSS Temporal Score:	3.2 (Low)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	3.2 (Low)

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

CVSS Base Score:	4.0 (Medium)
Impact Subscore:	1.4
Exploitability Subscore:	2.2
CVSS Temporal Score:	3.5 (Low)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	3.5 (Low)

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Plugin Source

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# SUSE update advisory SUSE-SU-2022:14941-1. The text itself
# is copyright (C) SUSE.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(160068);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/22");

  script_cve_id("CVE-2021-3448", "CVE-2022-0934");
  script_xref(name:"SuSE", value:"SUSE-SU-2022:14941-1");

  script_name(english:"SUSE SLES11 Security Update : dnsmasq (SUSE-SU-2022:14941-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote SUSE host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote SUSE Linux SLES11 host has a package installed that is affected by multiple vulnerabilities as referenced in
the SUSE-SU-2022:14941-1 advisory.

  - A flaw was found in dnsmasq in versions before 2.85. When configured to use a specific server for a given
    network interface, dnsmasq uses a fixed port while forwarding queries. An attacker on the network, able to
    find the outgoing port used by dnsmasq, only needs to guess the random transmission ID to forge a reply
    and get it accepted by dnsmasq. This flaw makes a DNS Cache Poisoning attack much easier. The highest
    threat from this vulnerability is to data integrity. (CVE-2021-3448)

  - Petr Menk reports: Possible vulnerability [...] found in latest dnsmasq. It [was] found             with
    help of oss-fuzz Google project by me and short after that             independently also by Richard
    Johnson of Trellix Threat Labs. It is affected only by DHCPv6 requests, which could be crafted to
    modify already freed memory. [...] We think it might be triggered             remotely, but we do not
    think it could be used to execute remote             code. (CVE-2022-0934)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1183709");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1197872");
  # https://lists.suse.com/pipermail/sle-security-updates/2022-April/010787.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?561de372");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-3448");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2022-0934");
  script_set_attribute(attribute:"solution", value:
"Update the affected dnsmasq package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-3448");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/04/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/04/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/04/22");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:dnsmasq");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:11");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/SuSE/release", "Host/SuSE/rpm-list");

  exit(0);
}


include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var release = get_kb_item("Host/SuSE/release");
if (isnull(release) || release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
var os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'SUSE');
os_ver = os_ver[1];
if (! preg(pattern:"^(SLES11)$", string:os_ver)) audit(AUDIT_OS_NOT, 'SUSE SLES11', 'SUSE ' + os_ver);

if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

var 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, 'SUSE ' + os_ver, cpu);

var sp = get_kb_item("Host/SuSE/patchlevel");
if (isnull(sp)) sp = "0";
if (os_ver == "SLES11" && (! preg(pattern:"^(4)$", string:sp))) audit(AUDIT_OS_NOT, "SLES11 SP4", os_ver + " SP" + sp);

var pkgs = [
    {'reference':'dnsmasq-2.78-0.17.18.1', 'sp':'4', 'release':'SLES11', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sles-release-11.4']}
];

var ltss_caveat_required = FALSE;
var flag = 0;
foreach var package_array ( pkgs ) {
  var reference = NULL;
  var release = NULL;
  var sp = NULL;
  var cpu = NULL;
  var exists_check = NULL;
  var rpm_spec_vers_cmp = 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['exists_check'])) exists_check = package_array['exists_check'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (reference && release) {
    if (exists_check) {
      var check_flag = 0;
      foreach var check (exists_check) {
        if (!rpm_exists(release:release, rpm:check)) continue;
        if ('ltss' >< tolower(check)) ltss_caveat_required = TRUE;
        check_flag++;
      }
      if (!check_flag) continue;
    }
    if (rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, rpm_spec_vers_cmp:rpm_spec_vers_cmp)) flag++;
  }
}

if (flag)
{
  var ltss_plugin_caveat = NULL;
  if(ltss_caveat_required) ltss_plugin_caveat = '\n' +
    'NOTE: This vulnerability check contains fixes that apply to\n' +
    'packages only available in SUSE Enterprise Linux Server LTSS\n' +
    'repositories. Access to these package security updates require\n' +
    'a paid SUSE LTSS subscription.\n';
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get() + ltss_plugin_caveat
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'dnsmasq');
}

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/suse_SU-2022-14941-1.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\suse_SU-2022-14941-1.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/suse_SU-2022-14941-1.nasl

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How to Run

Here is how to run the SUSE SLES11 Security Update : dnsmasq (SUSE-SU-2022:14941-1) 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 SuSE Local Security Checks plugin family.
On the right side table select SUSE SLES11 Security Update : dnsmasq (SUSE-SU-2022:14941-1) plugin ID 160068.
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 suse_SU-2022-14941-1.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a suse_SU-2022-14941-1.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - suse_SU-2022-14941-1.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 suse_SU-2022-14941-1.nasl -t <IP/HOST>

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References

SuSE Security Advisory:

SUSE-SU-2022:14941-1

See also:

Similar and related Nessus plugins:

157663 - AlmaLinux 8 : dnsmasq (ALSA-2021:4153)
155069 - CentOS 8 : dnsmasq (CESA-2021:4153)
151535 - EulerOS Virtualization 2.9.1 : dnsmasq (EulerOS-SA-2021-2189)
151555 - EulerOS Virtualization 2.9.0 : dnsmasq (EulerOS-SA-2021-2199)
152303 - EulerOS 2.0 SP9 : dnsmasq (EulerOS-SA-2021-2242)
152290 - EulerOS 2.0 SP9 : dnsmasq (EulerOS-SA-2021-2268)
153651 - EulerOS 2.0 SP8 : dnsmasq (EulerOS-SA-2021-2458)
157980 - EulerOS Virtualization 3.0.6.0 : dnsmasq (EulerOS-SA-2022-1064)
147874 - FreeBSD : dnsmasq -- cache poisoning vulnerability in certain configurations (5b72b1ff-877c-11eb-bd4f-2f1d57dafe46)
156978 - GLSA-202105-20 : Dnsmasq: DNS cache poisoning
154756 - openSUSE 15 Security Update : dnsmasq (openSUSE-SU-2021:1426-1)
154665 - openSUSE 15 Security Update : dnsmasq (openSUSE-SU-2021:3530-1)
153031 - Photon OS 1.0: Dnsmasq PHSA-2021-1.0-0431
153038 - Photon OS 2.0: Dnsmasq PHSA-2021-2.0-0386
153032 - Photon OS 3.0: Dnsmasq PHSA-2021-3.0-0293
153039 - Photon OS 4.0: Dnsmasq PHSA-2021-4.0-0093
155168 - RHEL 8 : dnsmasq (RHSA-2021:4153)
148500 - Slackware 14.0 / 14.1 / 14.2 / current : dnsmasq (SSA:2021-102-01)
154646 - SUSE SLED15 / SLES15 Security Update : dnsmasq (SUSE-SU-2021:3530-1)
160072 - SUSE SLES15 Security Update : dnsmasq (SUSE-SU-2022:1288-1)
160071 - SUSE SLES12 Security Update : dnsmasq (SUSE-SU-2022:1289-1)
150143 - Ubuntu 18.04 LTS / 20.04 LTS / 21.04 : Dnsmasq vulnerability (USN-4976-1)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file suse_SU-2022-14941-1.nasl version 1.2. For more plugins, visit the Nessus Plugin Library.

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SUSE SLES11 Security Update : dnsmasq (SUSE-SU-2022:14941-1) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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