RHEL 7 : kpatch-patch (RHSA-2022:1373) - Nessus

High Plugin ID: 159731

This page contains detailed information about the RHEL 7 : kpatch-patch (RHSA-2022:1373) 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: 159731
Name: RHEL 7 : kpatch-patch (RHSA-2022:1373)
Filename: redhat-RHSA-2022-1373.nasl
Vulnerability Published: 2021-12-15
This Plugin Published: 2022-04-14
Last Modification Time: 2022-04-26
Plugin Version: 1.3
Plugin Type: local
Plugin Family: Red Hat Local Security Checks
Dependencies: redhat_repos.nasl, ssh_get_info.nasl
Required KB Items [?]: Host/cpu, Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list

Vulnerability Information

Synopsis

The remote Red Hat host is missing one or more security updates.

Description

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2022:1373 advisory.

- kernel: Use After Free in unix_gc() which could result in a local privilege escalation (CVE-2021-0920)

- kernel: use-after-free in RDMA listen() (CVE-2021-4028)

- kernel: fget: check that the fd still exists after getting a ref to it (CVE-2021-4083)

- kernel: failing usercopy allows for use-after-free exploitation (CVE-2022-22942)

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 packages.

Public Exploits

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

Here's the list of publicly known exploits and PoCs for verifying the RHEL 7 : kpatch-patch (RHSA-2022:1373) vulnerability:

GitHub: https://github.com/enterprisemodules/vulnerability_demo
[CVE-2021-0920]

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-2021-4083
CVSS V2 Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C/E:POC/RL:OF/RC:C

CVSS Base Score:	6.9 (Medium)
Impact Subscore:	10.0
Exploitability Subscore:	3.4
CVSS Temporal Score:	5.4 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	5.4 (Medium)

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

CVSS Base Score:	7.0 (High)
Impact Subscore:	5.9
Exploitability Subscore:	1.0
CVSS Temporal Score:	6.3 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.3 (Medium)

Go back to menu.

Plugin Source

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2022:1373. The text
# itself is copyright (C) Red Hat, Inc.
##

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

if (description)
{
  script_id(159731);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/26");

  script_cve_id(
    "CVE-2021-0920",
    "CVE-2021-4028",
    "CVE-2021-4083",
    "CVE-2022-22942"
  );
  script_xref(name:"RHSA", value:"2022:1373");

  script_name(english:"RHEL 7 : kpatch-patch (RHSA-2022:1373)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2022:1373 advisory.

  - kernel: Use After Free in unix_gc() which could result in a local privilege escalation (CVE-2021-0920)

  - kernel: use-after-free in RDMA listen() (CVE-2021-4028)

  - kernel: fget: check that the fd still exists after getting a ref to it (CVE-2021-4083)

  - kernel: failing usercopy allows for use-after-free exploitation (CVE-2022-22942)

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://cwe.mitre.org/data/definitions/416.html");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2021-0920");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2021-4028");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2021-4083");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2022-22942");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2022:1373");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/2027201");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/2029923");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/2031930");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/2044809");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-4083");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(416);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/12/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/04/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/04/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_e4s:7.7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kpatch-patch-3_10_0-1062_49_1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kpatch-patch-3_10_0-1062_51_1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kpatch-patch-3_10_0-1062_52_2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kpatch-patch-3_10_0-1062_56_1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kpatch-patch-3_10_0-1062_59_1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kpatch-patch-3_10_0-1062_60_1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kpatch-patch-3_10_0-1062_61_1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kpatch-patch-3_10_0-1062_63_1");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Red Hat 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", "redhat_repos.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm.inc');
include('rhel.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var release = get_kb_item('Host/RedHat/release');
if (isnull(release) || 'Red Hat' >!< release) audit(AUDIT_OS_NOT, 'Red Hat');
var os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
var os_ver = os_ver[1];
if (!rhel_check_release(operator: 'eq', os_version: os_ver, rhel_version: '7.7')) audit(AUDIT_OS_NOT, 'Red Hat 7.7', 'Red Hat ' + os_ver);

if (!get_kb_item('Host/RedHat/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, 'Red Hat', cpu);

var uname_r = get_kb_item("Host/uname-r");
if (empty_or_null(uname_r)) audit(AUDIT_UNKNOWN_APP_VER, "kernel");

var repositories = {
    'rhel_e4s_7_7_server': [
      'rhel-7-server-aus-debug-rpms',
      'rhel-7-server-aus-optional-debug-rpms',
      'rhel-7-server-aus-optional-rpms',
      'rhel-7-server-aus-optional-source-rpms',
      'rhel-7-server-aus-rpms',
      'rhel-7-server-aus-source-rpms',
      'rhel-7-server-e4s-debug-rpms',
      'rhel-7-server-e4s-debug-rpms__7_DOT_7__x86_64',
      'rhel-7-server-e4s-optional-debug-rpms',
      'rhel-7-server-e4s-optional-debug-rpms__7_DOT_7__x86_64',
      'rhel-7-server-e4s-optional-rpms',
      'rhel-7-server-e4s-optional-rpms__7_DOT_7__x86_64',
      'rhel-7-server-e4s-optional-source-rpms',
      'rhel-7-server-e4s-optional-source-rpms__7_DOT_7__x86_64',
      'rhel-7-server-e4s-rpms',
      'rhel-7-server-e4s-rpms__7_DOT_7__x86_64',
      'rhel-7-server-e4s-source-rpms',
      'rhel-7-server-e4s-source-rpms__7_DOT_7__x86_64',
      'rhel-7-server-tus-debug-rpms',
      'rhel-7-server-tus-optional-debug-rpms',
      'rhel-7-server-tus-optional-rpms',
      'rhel-7-server-tus-optional-source-rpms',
      'rhel-7-server-tus-rpms',
      'rhel-7-server-tus-source-rpms',
      'rhel-ha-for-rhel-7-server-e4s-debug-rpms',
      'rhel-ha-for-rhel-7-server-e4s-debug-rpms__7_DOT_7__x86_64',
      'rhel-ha-for-rhel-7-server-e4s-rpms',
      'rhel-ha-for-rhel-7-server-e4s-rpms__7_DOT_7__x86_64',
      'rhel-ha-for-rhel-7-server-e4s-source-rpms',
      'rhel-ha-for-rhel-7-server-e4s-source-rpms__7_DOT_7__x86_64'
    ],
    'rhel_extras_sap_e4s_7_7': [
      'rhel-sap-for-rhel-7-server-e4s-debug-rpms',
      'rhel-sap-for-rhel-7-server-e4s-debug-rpms__7_DOT_7__x86_64',
      'rhel-sap-for-rhel-7-server-e4s-rpms',
      'rhel-sap-for-rhel-7-server-e4s-rpms__7_DOT_7__x86_64',
      'rhel-sap-for-rhel-7-server-e4s-source-rpms',
      'rhel-sap-for-rhel-7-server-e4s-source-rpms__7_DOT_7__x86_64'
    ],
    'rhel_extras_sap_hana_e4s_7_7': [
      'rhel-sap-hana-for-rhel-7-server-e4s-debug-rpms',
      'rhel-sap-hana-for-rhel-7-server-e4s-debug-rpms__7_DOT_7__x86_64',
      'rhel-sap-hana-for-rhel-7-server-e4s-rpms',
      'rhel-sap-hana-for-rhel-7-server-e4s-rpms__7_DOT_7__x86_64',
      'rhel-sap-hana-for-rhel-7-server-e4s-source-rpms',
      'rhel-sap-hana-for-rhel-7-server-e4s-source-rpms__7_DOT_7__x86_64'
    ]
};

var repo_sets = rhel_get_valid_repo_sets(repositories:repositories);
if(repo_sets == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);

var kernel_live_checks = {
    '3.10.0-1062.49.1.el7.x86_64': {'reference':'kpatch-patch-3_10_0-1062_49_1-1-6.el7', 'sp':'7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'repo_list':['rhel_e4s_7_7_server', 'rhel_extras_sap_e4s_7_7', 'rhel_extras_sap_hana_e4s_7_7']},
    '3.10.0-1062.51.1.el7.x86_64': {'reference':'kpatch-patch-3_10_0-1062_51_1-1-6.el7', 'sp':'7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'repo_list':['rhel_e4s_7_7_server', 'rhel_extras_sap_e4s_7_7', 'rhel_extras_sap_hana_e4s_7_7']},
    '3.10.0-1062.52.2.el7.x86_64': {'reference':'kpatch-patch-3_10_0-1062_52_2-1-5.el7', 'sp':'7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'repo_list':['rhel_e4s_7_7_server', 'rhel_extras_sap_e4s_7_7', 'rhel_extras_sap_hana_e4s_7_7']},
    '3.10.0-1062.56.1.el7.x86_64': {'reference':'kpatch-patch-3_10_0-1062_56_1-1-4.el7', 'sp':'7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'repo_list':['rhel_e4s_7_7_server', 'rhel_extras_sap_e4s_7_7', 'rhel_extras_sap_hana_e4s_7_7']},
    '3.10.0-1062.59.1.el7.x86_64': {'reference':'kpatch-patch-3_10_0-1062_59_1-1-2.el7', 'sp':'7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'repo_list':['rhel_e4s_7_7_server', 'rhel_extras_sap_e4s_7_7', 'rhel_extras_sap_hana_e4s_7_7']},
    '3.10.0-1062.60.1.el7.x86_64': {'reference':'kpatch-patch-3_10_0-1062_60_1-1-2.el7', 'sp':'7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'repo_list':['rhel_e4s_7_7_server', 'rhel_extras_sap_e4s_7_7', 'rhel_extras_sap_hana_e4s_7_7']},
    '3.10.0-1062.61.1.el7.x86_64': {'reference':'kpatch-patch-3_10_0-1062_61_1-1-2.el7', 'sp':'7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'repo_list':['rhel_e4s_7_7_server', 'rhel_extras_sap_e4s_7_7', 'rhel_extras_sap_hana_e4s_7_7']},
    '3.10.0-1062.63.1.el7.x86_64': {'reference':'kpatch-patch-3_10_0-1062_63_1-1-1.el7', 'sp':'7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE, 'repo_list':['rhel_e4s_7_7_server', 'rhel_extras_sap_e4s_7_7', 'rhel_extras_sap_hana_e4s_7_7']}
};

var kpatch_details = kernel_live_checks[uname_r];
if (empty_or_null(kpatch_details)) audit(AUDIT_INST_VER_NOT_VULN, 'kernel', uname_r);

var flag = 0;
var reference = NULL;
var release = NULL;
var sp = NULL;
var cpu = NULL;
var el_string = NULL;
var rpm_spec_vers_cmp = NULL;
var epoch = NULL;
var allowmaj = NULL;
var exists_check = NULL;
var repo_list = NULL;
if (!empty_or_null(kpatch_details['repo_list'])) repo_list = kpatch_details['repo_list'];
if (!empty_or_null(kpatch_details['reference'])) reference = kpatch_details['reference'];
if (!empty_or_null(kpatch_details['release'])) release = 'RHEL' + kpatch_details['release'];
if (!empty_or_null(kpatch_details['sp'])) sp = kpatch_details['sp'];
if (!empty_or_null(kpatch_details['cpu'])) cpu = kpatch_details['cpu'];
if (!empty_or_null(kpatch_details['el_string'])) el_string = kpatch_details['el_string'];
if (!empty_or_null(kpatch_details['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = kpatch_details['rpm_spec_vers_cmp'];
if (!empty_or_null(kpatch_details['epoch'])) epoch = kpatch_details['epoch'];
if (!empty_or_null(kpatch_details['allowmaj'])) allowmaj = kpatch_details['allowmaj'];
if (!empty_or_null(kpatch_details['exists_check'])) exists_check = kpatch_details['exists_check'];
if (reference &&
    release &&
    (rhel_decide_repo_check(repo_list:repo_list, repo_sets:repo_sets) || (!exists_check || rpm_exists(release:release, rpm:exists_check))) &&
    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)
{
  var subscription_caveat = '\n' +
    'NOTE: This vulnerability check contains fixes that apply to\n' +
    'packages only available in the Red Hat Enterprise Linux\n' +
    'Update Services for SAP Solutions repository.\n' +
    'Access to this repository requires a paid RHEL subscription.\n';
  var extra = NULL;
  if (empty_or_null(repo_sets)) extra = subscription_caveat + rpm_report_get() + redhat_report_repo_caveat();
  else extra = subscription_caveat + rpm_report_get() + redhat_report_package_caveat();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'kpatch-patch-3_10_0-1062_49_1 / kpatch-patch-3_10_0-1062_51_1 / etc');
}

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/redhat-RHSA-2022-1373.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\redhat-RHSA-2022-1373.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/redhat-RHSA-2022-1373.nasl

Go back to menu.

How to Run

Here is how to run the RHEL 7 : kpatch-patch (RHSA-2022:1373) 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 Red Hat Local Security Checks plugin family.
On the right side table select RHEL 7 : kpatch-patch (RHSA-2022:1373) plugin ID 159731.
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 redhat-RHSA-2022-1373.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a redhat-RHSA-2022-1373.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - redhat-RHSA-2022-1373.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 redhat-RHSA-2022-1373.nasl -t <IP/HOST>

Go back to menu.

References

RHSA | Red Hat Security Advisory:

2022:1373

CWE | Common Weakness Enumeration:

CWE-416 (Weakness) Use After Free

See also:

Similar and related Nessus plugins:

159302 - CentOS 8 : kernel (CESA-2022:0825)
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159748 - SUSE SLES15 Security Update : kernel (SUSE-SU-2022:1197-1)
159752 - SUSE SLES15 Security Update : kernel (Live Patch 25 for SLE 15 SP1) (SUSE-SU-2022:1212-1)
159754 - SUSE SLES15 Security Update : kernel (Live Patch 24 for SLE 15 SP1) (SUSE-SU-2022:1193-1)
159756 - SUSE SLES15 Security Update : kernel (Live Patch 18 for SLE 15 SP2) (SUSE-SU-2022:1194-1)
159768 - SUSE SLES12 Security Update : kernel (Live Patch 18 for SLE 12 SP5) (SUSE-SU-2022:1242-1)
159769 - SUSE SLES15 Security Update : kernel (Live Patch 12 for SLE 15 SP3) (SUSE-SU-2022:1223-1)
159811 - EulerOS 2.0 SP9 : kernel (EulerOS-SA-2022-1450)
159815 - EulerOS 2.0 SP9 : kernel (EulerOS-SA-2022-1429)
159840 - EulerOS Virtualization 2.10.1 : kernel (EulerOS-SA-2022-1376)
159861 - EulerOS Virtualization 2.10.0 : kernel (EulerOS-SA-2022-1402)
159884 - SUSE SLES15 Security Update : kernel (Live Patch 1 for SLE 15 SP3) (SUSE-SU-2022:1246-1)
159901 - RHEL 8 : kernel-rt (RHSA-2022:1413)
159908 - RHEL 6 : kernel (RHSA-2022:1417)
159913 - RHEL 8 : kpatch-patch (RHSA-2022:1418)
159931 - SUSE SLES15 Security Update : kernel (SUSE-SU-2022:1257-1)
160035 - EulerOS 2.0 SP10 : kernel (EulerOS-SA-2022-1475)

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RHEL 7 : kpatch-patch (RHSA-2022:1373) - Nessus

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