SUSE SLES15 Security Update : the Linux RT Kernel (SUSE-SU-2021:3979-1) - Nessus

Medium Plugin ID: 155992

This page contains detailed information about the SUSE SLES15 Security Update : the Linux RT Kernel (SUSE-SU-2021:3979-1) 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: 155992
Name: SUSE SLES15 Security Update : the Linux RT Kernel (SUSE-SU-2021:3979-1)
Filename: suse_SU-2021-3979-1.nasl
Vulnerability Published: 2021-05-06
This Plugin Published: 2021-12-10
Last Modification Time: 2022-02-22
Plugin Version: 1.3
Plugin Type: local
Plugin Family: SuSE Local Security Checks
Dependencies: linux_alt_patch_detect.nasl, ssh_get_info.nasl
Required KB Items [?]: Host/cpu, Host/local_checks_enabled, Host/SuSE/release, Host/SuSE/rpm-list

Vulnerability Information

Synopsis

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

Description

The remote SUSE Linux SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3979-1 advisory.

- In bpf_skb_change_head of filter.c, there is a possible out of bounds read due to a use after free. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-154177719References: Upstream kernel (CVE-2021-0941)

- A flaw in the processing of received ICMP errors (ICMP fragment needed and ICMP redirect) in the Linux kernel functionality was found to allow the ability to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypass the source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on UDP source port randomization are indirectly affected as well. (CVE-2021-20322)

- An out-of-bounds (OOB) memory write flaw was found in list_devices in drivers/md/dm-ioctl.c in the Multi- device driver module in the Linux kernel before 5.12. A bound check failure allows an attacker with special user (CAP_SYS_ADMIN) privilege to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to system availability. (CVE-2021-31916)

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 SUSE SLES15 Security Update : the Linux RT Kernel (SUSE-SU-2021:3979-1) vulnerability:

GitHub: https://github.com/JamesGeee/CVE-2021-31916
[CVE-2021-31916: PoC for exploiting CVE-2021-31916]

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-2021-0941
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

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The package checks in this plugin were extracted from
# SUSE update advisory SUSE-SU-2021:3979-1. The text itself
# is copyright (C) SUSE.
##

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

if (description)
{
  script_id(155992);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/02/22");

  script_cve_id(
    "CVE-2021-0941",
    "CVE-2021-20322",
    "CVE-2021-31916",
    "CVE-2021-34981"
  );
  script_xref(name:"SuSE", value:"SUSE-SU-2021:3979-1");

  script_name(english:"SUSE SLES15 Security Update : the Linux RT Kernel (SUSE-SU-2021:3979-1)");

  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 SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in
the SUSE-SU-2021:3979-1 advisory.

  - In bpf_skb_change_head of filter.c, there is a possible out of bounds read due to a use after free. This
    could lead to local escalation of privilege with System execution privileges needed. User interaction is
    not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-154177719References:
    Upstream kernel (CVE-2021-0941)

  - A flaw in the processing of received ICMP errors (ICMP fragment needed and ICMP redirect) in the Linux
    kernel functionality was found to allow the ability to quickly scan open UDP ports. This flaw allows an
    off-path remote user to effectively bypass the source port UDP randomization. The highest threat from this
    vulnerability is to confidentiality and possibly integrity, because software that relies on UDP source
    port randomization are indirectly affected as well. (CVE-2021-20322)

  - An out-of-bounds (OOB) memory write flaw was found in list_devices in drivers/md/dm-ioctl.c in the Multi-
    device driver module in the Linux kernel before 5.12. A bound check failure allows an attacker with
    special user (CAP_SYS_ADMIN) privilege to gain access to out-of-bounds memory leading to a system crash or
    a leak of internal kernel information. The highest threat from this vulnerability is to system
    availability. (CVE-2021-31916)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1152489");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1169263");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1170269");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1184924");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1190523");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1190795");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1191790");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1191961");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192045");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192217");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192273");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192328");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192375");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192473");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192691");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192718");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192740");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192745");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192750");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192753");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192758");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192781");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192802");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192874");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192896");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192906");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1192918");
  # https://lists.suse.com/pipermail/sle-security-updates/2021-December/009875.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?adbd9cc2");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-0941");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-20322");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-31916");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-34981");
  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-2021-0941");

  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:"2021/05/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/12/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/12/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:cluster-md-kmp-rt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:dlm-kmp-rt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:gfs2-kmp-rt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-devel-rt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-rt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-rt-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-rt_debug-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-source-rt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-syms-rt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:ocfs2-kmp-rt");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:15");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2021-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


include('audit.inc');
include('global_settings.inc');
include('misc_func.inc');
include('rpm.inc');
include('ksplice.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:"^(SLES15)$", string:os_ver)) audit(AUDIT_OS_NOT, 'SUSE SLES15', '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 == "SLES15" && (! preg(pattern:"^(3)$", string:sp))) audit(AUDIT_OS_NOT, "SLES15 SP3", os_ver + " SP" + sp);

var pkgs = [
    {'reference':'cluster-md-kmp-rt-5.3.18-65.2', 'sp':'3', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sle-module-rt-release-15.3'},
    {'reference':'dlm-kmp-rt-5.3.18-65.2', 'sp':'3', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sle-module-rt-release-15.3'},
    {'reference':'gfs2-kmp-rt-5.3.18-65.2', 'sp':'3', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sle-module-rt-release-15.3'},
    {'reference':'kernel-devel-rt-5.3.18-65.2', 'sp':'3', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sle-module-rt-release-15.3'},
    {'reference':'kernel-rt-5.3.18-65.2', 'sp':'3', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sle-module-rt-release-15.3'},
    {'reference':'kernel-rt-devel-5.3.18-65.2', 'sp':'3', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sle-module-rt-release-15.3'},
    {'reference':'kernel-rt_debug-devel-5.3.18-65.2', 'sp':'3', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sle-module-rt-release-15.3'},
    {'reference':'kernel-source-rt-5.3.18-65.2', 'sp':'3', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sle-module-rt-release-15.3'},
    {'reference':'kernel-syms-rt-5.3.18-65.1', 'sp':'3', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sle-module-rt-release-15.3'},
    {'reference':'ocfs2-kmp-rt-5.3.18-65.2', 'sp':'3', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'sle-module-rt-release-15.3'}
];

var ltss_caveat_required = FALSE;
var flag = 0;
foreach 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) {
      if (!rpm_exists(release:release, rpm:exists_check)) continue;
      if ('ltss' >< tolower(exists_check)) ltss_caveat_required = TRUE;
    }
    if (rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, rpm_spec_vers_cmp:rpm_spec_vers_cmp)) flag++;
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'cluster-md-kmp-rt / dlm-kmp-rt / gfs2-kmp-rt / kernel-devel-rt / etc');
}

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-2021-3979-1.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\suse_SU-2021-3979-1.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/suse_SU-2021-3979-1.nasl

Go back to menu.

How to Run

Here is how to run the SUSE SLES15 Security Update : the Linux RT Kernel (SUSE-SU-2021:3979-1) 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 SLES15 Security Update : the Linux RT Kernel (SUSE-SU-2021:3979-1) plugin ID 155992.
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-2021-3979-1.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a suse_SU-2021-3979-1.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-2021-3979-1.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-2021-3979-1.nasl -t <IP/HOST>

Go back to menu.

References

SuSE Security Advisory:

SUSE-SU-2021:3979-1

See also:

Similar and related Nessus plugins:

155070 - CentOS 8 : kernel-rt (CESA-2021:4140)
155145 - CentOS 8 : kernel (CESA-2021:4356)
155172 - RHEL 8 : kernel-rt (RHSA-2021:4140)
155219 - RHEL 8 : kernel (RHSA-2021:4356)
155425 - Oracle Linux 8 : kernel (ELSA-2021-4356)
155792 - SUSE SLES12 Security Update : kernel (SUSE-SU-2021:3848-1)
155824 - openSUSE 15 Security Update : kernel (openSUSE-SU-2021:3876-1)
155829 - SUSE SLED12 / SLES12 Security Update : kernel (SUSE-SU-2021:3877-1)
155840 - SUSE SLES15 Security Update : kernel (SUSE-SU-2021:3876-1)
155883 - openSUSE 15 Security Update : kernel (openSUSE-SU-2021:3941-1)
155893 - SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2021:3941-1)
155902 - SUSE SLES12 Security Update : kernel (SUSE-SU-2021:3935-1)
155910 - SUSE SLES12 Security Update : kernel (SUSE-SU-2021:3929-1)
155912 - SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2021:3933-1)
155930 - SUSE SLES15 Security Update : kernel (SUSE-SU-2021:3969-1)
155959 - SUSE SLES12 Security Update : kernel (SUSE-SU-2021:3972-1)
155981 - SUSE SLES15 Security Update : the Linux RT Kernel (SUSE-SU-2021:3978-1)
156009 - SUSE SLES12 Security Update : the Linux RT Kernel (SUSE-SU-2021:3992-1)
156163 - Debian DLA-2843-1 : linux - LTS security update
156431 - EulerOS 2.0 SP5 : kernel (EulerOS-SA-2021-2934)
156534 - EulerOS Virtualization 3.0.2.6 : kernel (EulerOS-SA-2021-2857)
157208 - EulerOS 2.0 SP9 : kernel (EulerOS-SA-2022-1010)
157213 - EulerOS 2.0 SP9 : kernel (EulerOS-SA-2022-1030)
157352 - Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-5268-1)
157410 - Amazon Linux AMI : kernel (ALAS-2022-1563)
157497 - AlmaLinux 8 : kernel (ALSA-2021:4356)
158016 - EulerOS Virtualization 3.0.6.0 : kernel (EulerOS-SA-2022-1070)
158040 - EulerOS Virtualization 3.0.6.6 : kernel (EulerOS-SA-2022-1155)
158288 - EulerOS 2.0 SP3 : kernel (EulerOS-SA-2022-1171)
158396 - EulerOS 2.0 SP10 : kernel (EulerOS-SA-2022-1208)
158524 - EulerOS 2.0 SP9 : kernel (EulerOS-SA-2022-1292)
158543 - EulerOS 2.0 SP9 : kernel (EulerOS-SA-2022-1308)
158761 - Debian DSA-5096-1 : linux - security update
159262 - EulerOS 2.0 SP8 : kernel (EulerOS-SA-2022-1352)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file suse_SU-2021-3979-1.nasl version 1.3. For more plugins, visit the Nessus Plugin Library.

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SUSE SLES15 Security Update : the Linux RT Kernel (SUSE-SU-2021:3979-1) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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