openSUSE 15 Security Update : kernel (openSUSE-SU-2021:2409-1) - Nessus

High Plugin ID: 151851

This page contains detailed information about the openSUSE 15 Security Update : kernel (openSUSE-SU-2021:2409-1) 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: 151851
Name: openSUSE 15 Security Update : kernel (openSUSE-SU-2021:2409-1)
Filename: openSUSE-2021-2409.nasl
Vulnerability Published: 2021-04-20
This Plugin Published: 2021-07-21
Last Modification Time: 2022-01-20
Plugin Version: 1.4
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

Synopsis

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

Description

The remote SUSE Linux SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:2409-1 advisory.

- A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c. This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space (CVE-2021-22555)

- fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05. (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.

Solution

Update the affected packages.

Public Exploits

Target Network Port(s): N/A
Target Asset(s): N/A
Exploit Available: True (Metasploit Framework, Exploit-DB, GitHub)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the openSUSE 15 Security Update : kernel (openSUSE-SU-2021:2409-1) vulnerability:

Metasploit: exploit/linux/local/netfilter_xtables_heap_oob_write_priv_esc
[Netfilter x_tables Heap OOB Write Privilege Escalation]
Exploit-DB: exploits/linux/local/50135.c
[EDB-50135: Linux Kernel 2.6.19 < 5.9 - 'Netfilter Local Privilege Escalation]
GitHub: https://github.com/Al1ex/LinuxEelvation
[CVE-2021-22555]
GitHub: https://github.com/ChoKyuWon/exploit_articles
[CVE-2021-22555]
GitHub: https://github.com/EGI-Federation/SVG-advisories
[CVE-2021-22555]
GitHub: https://github.com/JoneyJunior/cve-2021-22555
[CVE-2021-22555]
GitHub: https://github.com/JustYoomoon/CVE-2021-22555-Exploit
[CVE-2021-22555: CVE-2021-22555 Exploit]
GitHub: https://github.com/Metarget/awesome-cloud-native-security
[CVE-2021-22555]
GitHub: https://github.com/Metarget/metarget
[CVE-2021-22555]
GitHub: https://github.com/Mr-xn/Penetration_Testing_POC
[CVE-2021-22555]
GitHub: https://github.com/YunDingLab/struct_sanitizer
[CVE-2021-22555]
GitHub: https://github.com/bcoles/kasld
[CVE-2021-22555]
GitHub: https://github.com/bcoles/kernel-exploits
[CVE-2021-22555]
GitHub: https://github.com/bsauce/kernel-exploit-factory
[CVE-2021-22555]
GitHub: https://github.com/bsauce/kernel-security-learning
[CVE-2021-22555]
GitHub: https://github.com/cgwalters/container-cve-2021-22555
[CVE-2021-22555]
GitHub: https://github.com/cpuu/LinuxKernelCVE
[CVE-2021-22555]
GitHub: https://github.com/ctrsploit/ctrsploit
[CVE-2021-22555]
GitHub: https://github.com/daletoniris/CVE-2021-22555-esc-priv
[CVE-2021-22555]
GitHub: https://github.com/hacking-kubernetes/hacking-kubernetes.info
[CVE-2021-22555]
GitHub: https://github.com/joydo/CVE-Writeups
[CVE-2021-22555]
GitHub: https://github.com/reni2study/Cloud-Native-Security2
[CVE-2021-22555]
GitHub: https://github.com/ssst0n3/ctrsploit_archived
[CVE-2021-22555]
GitHub: https://github.com/veritas501/CVE-2021-22555-PipeVersion
[CVE-2021-22555: CVE-2021-22555 exploit rewritten with pipe primitive]
GitHub: https://github.com/xairy/linux-kernel-exploitation
[CVE-2021-22555]
GitHub: https://github.com/xyjl-ly/CVE-2021-22555-Exploit
[CVE-2021-22555]
GitHub: https://github.com/AlAIAL90/CVE-2021-33909
[CVE-2021-33909: PoC for exploiting CVE-2021-33909 : fs/seq_file.c in the Linux kernel 3.16 through ...]
GitHub: https://github.com/AmIAHuman/CVE-2021-33909
[CVE-2021-33909: Sequoia exploit (7/20/21)]
GitHub: https://github.com/ChoKyuWon/exploit_articles
[CVE-2021-33909]
GitHub: https://github.com/EGI-Federation/SVG-advisories
[CVE-2021-33909]
GitHub: https://github.com/H0j3n/EzpzCheatSheet
[CVE-2021-33909]
GitHub: https://github.com/Mr-xn/Penetration_Testing_POC
[CVE-2021-33909]
GitHub: https://github.com/gitezri/LinuxVulnerabilities
[CVE-2021-33909]
GitHub: https://github.com/hac425xxx/heap-exploitation-in-real-world
[CVE-2021-33909]
GitHub: https://github.com/ikramimamoglu/AmIAHuman-CVE-2021-33909
[CVE-2021-33909]
GitHub: https://github.com/joydo/CVE-Writeups
[CVE-2021-33909]
GitHub: https://github.com/kaosagnt/ansible-everyday
[CVE-2021-33909]
GitHub: https://github.com/sfowl/deep-directory
[CVE-2021-33909]
GitHub: https://github.com/xairy/linux-kernel-exploitation
[CVE-2021-33909]
GitHub: https://github.com/baerwolf/cve-2021-33909
[CVE-2021-33909: This module fixes an issue in the kernels filesystem layer (CVE-2021-33909) by ...]
GitHub: https://github.com/bbinfosec43/CVE-2021-33909
[CVE-2021-33909: Exploit code for CVE-2021-33909,Just a dump of removed https://github.com/AmIAHuman/ ...]
GitHub: https://github.com/ChrisTheCoolHut/CVE-2021-33909
[CVE-2021-33909: CVE-2021-33909 Sequoia]
GitHub: https://github.com/Liang2580/CVE-2021-33909
[CVE-2021-33909: Sequoia exploit (7/20/21)]

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-2021-33909
CVSS V2 Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C/E:H/RL:OF/RC:C

CVSS Base Score:	7.2 (High)
Impact Subscore:	10.0
Exploitability Subscore:	3.9
CVSS Temporal Score:	6.3 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.3 (Medium)

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

CVSS Base Score:	7.8 (High)
Impact Subscore:	5.9
Exploitability Subscore:	1.8
CVSS Temporal Score:	7.5 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.5 (High)

STIG Severity [?]: II
STIG Risk Rating: 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
# openSUSE Security Update openSUSE-SU-2021:2409-1. The text itself
# is copyright (C) SUSE.
##

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

if (description)
{
  script_id(151851);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/01/20");

  script_cve_id("CVE-2021-22555", "CVE-2021-33909");
  script_xref(name:"IAVA", value:"2021-A-0350");

  script_name(english:"openSUSE 15 Security Update : kernel (openSUSE-SU-2021:2409-1)");

  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 SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in
the openSUSE-SU-2021:2409-1 advisory.

  - A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c.
    This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name
    space (CVE-2021-22555)

  - fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer
    allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an
    unprivileged user, aka CID-8cae8cd89f05. (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.");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1152489");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1182470");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1185486");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1187927");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1187972");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1187980");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1188062");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1188116");
  # https://lists.opensuse.org/archives/list/[email protected]/thread/PZY5AYK3E4EZBBTJOQXWCMRDFFYLM6EB/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6788505d");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-22555");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2021-33909");
  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_set_attribute(attribute:"metasploit_name", value:'Netfilter x_tables Heap OOB Write Privilege Escalation');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/04/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/07/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/07/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:cluster-md-kmp-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:dlm-kmp-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:gfs2-kmp-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:kernel-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:kernel-azure-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:kernel-azure-extra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:kernel-azure-livepatch-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:kernel-azure-optional");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:kernel-devel-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:kernel-source-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:kernel-syms-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:kselftests-kmp-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:ocfs2-kmp-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:reiserfs-kmp-azure");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:15.3");
  script_set_attribute(attribute:"stig_severity", value:"II");
  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");
  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');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item('Host/SuSE/release');
if (isnull(release) || release =~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, 'openSUSE');
os_ver = pregmatch(pattern: "^SUSE([\d.]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'openSUSE');
os_ver = os_ver[1];
if (release !~ "^(SUSE15\.3)$") audit(AUDIT_OS_RELEASE_NOT, 'openSUSE', '15.3', release);
if (!get_kb_item("Host/SuSE/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, 'openSUSE ' + os_ver, cpu);

pkgs = [
    {'reference':'cluster-md-kmp-azure-5.3.18-38.14.1', 'cpu':'x86_64', 'release':'SUSE15.3', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'dlm-kmp-azure-5.3.18-38.14.1', 'cpu':'x86_64', 'release':'SUSE15.3', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'gfs2-kmp-azure-5.3.18-38.14.1', 'cpu':'x86_64', 'release':'SUSE15.3', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-azure-5.3.18-38.14.1', 'cpu':'x86_64', 'release':'SUSE15.3', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-azure-devel-5.3.18-38.14.1', 'cpu':'x86_64', 'release':'SUSE15.3', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-azure-extra-5.3.18-38.14.1', 'cpu':'x86_64', 'release':'SUSE15.3', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-azure-livepatch-devel-5.3.18-38.14.1', 'cpu':'x86_64', 'release':'SUSE15.3', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-azure-optional-5.3.18-38.14.1', 'cpu':'x86_64', 'release':'SUSE15.3', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-devel-azure-5.3.18-38.14.1', 'release':'SUSE15.3', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-source-azure-5.3.18-38.14.1', 'release':'SUSE15.3', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kernel-syms-azure-5.3.18-38.14.1', 'cpu':'x86_64', 'release':'SUSE15.3', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'kselftests-kmp-azure-5.3.18-38.14.1', 'cpu':'x86_64', 'release':'SUSE15.3', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ocfs2-kmp-azure-5.3.18-38.14.1', 'cpu':'x86_64', 'release':'SUSE15.3', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'reiserfs-kmp-azure-5.3.18-38.14.1', 'cpu':'x86_64', 'release':'SUSE15.3', 'rpm_spec_vers_cmp':TRUE}
];

flag = 0;
foreach package_array ( pkgs ) {
  reference = NULL;
  release = NULL;
  cpu = NULL;
  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['cpu'])) cpu = package_array['cpu'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (reference && release) {
    if (rpm_check(release:release, 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
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'cluster-md-kmp-azure / dlm-kmp-azure / gfs2-kmp-azure / kernel-azure / etc');
}

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/openSUSE-2021-2409.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\openSUSE-2021-2409.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/openSUSE-2021-2409.nasl

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How to Run

Here is how to run the openSUSE 15 Security Update : kernel (openSUSE-SU-2021:2409-1) 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 openSUSE 15 Security Update : kernel (openSUSE-SU-2021:2409-1) plugin ID 151851.
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 openSUSE-2021-2409.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a openSUSE-2021-2409.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - openSUSE-2021-2409.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 openSUSE-2021-2409.nasl -t <IP/HOST>

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References

IAVA | Information Assurance Vulnerability Alert:

2021-A-0350

See also:

Similar and related Nessus plugins:

151842 - RHEL 7 : kernel (RHSA-2021:2733)
151843 - RHEL 7 : kpatch-patch (RHSA-2021:2731)
151846 - RHEL 8 : kernel (RHSA-2021:2714)
151847 - openSUSE 15 Security Update : kernel (openSUSE-SU-2021:2415-1)
151850 - RHEL 8 : kpatch-patch (RHSA-2021:2723)
151856 - RHEL 8 : kernel-rt (RHSA-2021:2719)
151857 - RHEL 8 : kernel (RHSA-2021:2718)
151858 - RHEL 7 : kernel (RHSA-2021:2732)
151859 - RHEL 7 : kernel (RHSA-2021:2734)
151862 - RHEL 8 : kernel (RHSA-2021:2722)
151863 - RHEL 7 : kpatch-patch (RHSA-2021:2727)
151864 - RHEL 8 : kpatch-patch (RHSA-2021:2716)
151867 - RHEL 7 : kernel (RHSA-2021:2730)
151870 - SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2021:2415-1)
151871 - RHEL 8 : kernel-rt (RHSA-2021:2715)
151872 - RHEL 8 : kpatch-patch (RHSA-2021:2720)
151873 - SUSE SLED12 / SLES12 Security Update : kernel (SUSE-SU-2021:2416-1)
151877 - SUSE SLES12 Security Update : kernel (SUSE-SU-2021:2407-1)
151878 - SUSE SLES12 Security Update : kernel (SUSE-SU-2021:2406-1)
151879 - CentOS 8 : kernel (CESA-2021:2714)
151880 - SUSE SLES15 Security Update : kernel (SUSE-SU-2021:2408-1)
151884 - SUSE SLES15 Security Update : kernel (SUSE-SU-2021:2409-1)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file openSUSE-2021-2409.nasl version 1.4. For more plugins, visit the Nessus Plugin Library.

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openSUSE 15 Security Update : kernel (openSUSE-SU-2021:2409-1) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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