Ubuntu 21.04 : Linux kernel vulnerabilities (USN-4950-1) - Nessus

High Plugin ID: 149406

This page contains detailed information about the Ubuntu 21.04 : Linux kernel vulnerabilities (USN-4950-1) 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: 149406
Name: Ubuntu 21.04 : Linux kernel vulnerabilities (USN-4950-1)
Filename: ubuntu_USN-4950-1.nasl
Vulnerability Published: 2021-05-11
This Plugin Published: 2021-05-12
Last Modification Time: 2021-09-03
Plugin Version: 1.4
Plugin Type: local
Plugin Family: Ubuntu Local Security Checks
Dependencies: linux_alt_patch_detect.nasl, ssh_get_info.nasl
Required KB Items [?]: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Vulnerability Information

Synopsis

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

Description

The remote Ubuntu 21.04 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4950-1 advisory. 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, GitHub)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the Ubuntu 21.04 : Linux kernel vulnerabilities (USN-4950-1) vulnerability:

Metasploit: exploit/linux/local/cve_2021_3490_ebpf_alu32_bounds_check_lpe
[Linux eBPF ALU32 32-bit Invalid Bounds Tracking LPE]
GitHub: https://github.com/0xsyr0/OSCP
[CVE-2021-3490]
GitHub: https://github.com/Al1ex/LinuxEelvation
[CVE-2021-3490]
GitHub: https://github.com/Mr-xn/Penetration_Testing_POC
[CVE-2021-3490]
GitHub: https://github.com/bsauce/kernel-exploit-factory
[CVE-2021-3490]
GitHub: https://github.com/bsauce/kernel-security-learning
[CVE-2021-3490]
GitHub: https://github.com/chompie1337/Linux_LPE_eBPF_CVE-2021-3490
[CVE-2021-3490]
GitHub: https://github.com/goldenscale/GS_GithubMirror
[CVE-2021-3490]
GitHub: https://github.com/joydo/CVE-Writeups
[CVE-2021-3490]
GitHub: https://github.com/xairy/linux-kernel-exploitation
[CVE-2021-3490]

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-2021-3491
CVSS V2 Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C

CVSS Base Score:	7.2 (High)
Impact Subscore:	10.0
Exploitability Subscore:	3.9
CVSS Temporal Score:	6.0 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.0 (Medium)

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

CVSS Base Score:	8.8 (High)
Impact Subscore:	6.0
Exploitability Subscore:	2.0
CVSS Temporal Score:	8.2 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	8.2 (High)

Go back to menu.

Plugin Source

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4950-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

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

if (description)
{
  script_id(149406);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/09/03");

  script_cve_id("CVE-2021-3489", "CVE-2021-3490", "CVE-2021-3491");
  script_xref(name:"USN", value:"4950-1");

  script_name(english:"Ubuntu 21.04 : Linux kernel vulnerabilities (USN-4950-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 21.04 host has packages installed that are affected by multiple vulnerabilities as referenced in the
USN-4950-1 advisory. 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://ubuntu.com/security/notices/USN-4950-1");
  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:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-3491");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Linux eBPF ALU32 32-bit Invalid Bounds Tracking LPE');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/05/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/05/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/05/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:21.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.11.0-1005-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.11.0-1006-oracle");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.11.0-1007-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.11.0-1007-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.11.0-1007-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.11.0-1008-raspi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.11.0-1008-raspi-nolpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.11.0-17-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.11.0-17-generic-64k");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.11.0-17-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-5.11.0-17-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-64k");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-64k-hwe-20.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-64k-hwe-20.04-edge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-hwe-20.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-hwe-20.04-edge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae-hwe-20.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae-hwe-20.04-edge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-gke");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency-hwe-20.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency-hwe-20.04-edge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-oem-20.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-oracle");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-raspi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-raspi-nolpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual-hwe-20.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual-hwe-20.04-edge");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2021 Canonical, Inc. / NASL script (C) 2021 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/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('audit.inc');
include('ubuntu.inc');
include('ksplice.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item('Host/Ubuntu/release');
if ( isnull(release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
release = chomp(release);
if (! preg(pattern:"^(21\.04)$", string:release)) audit(AUDIT_OS_NOT, 'Ubuntu 21.04', 'Ubuntu ' + release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) 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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  rm_kb_item(name:'Host/uptrack-uname-r');
  cve_list = make_list('CVE-2021-3489', 'CVE-2021-3490', 'CVE-2021-3491');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-4950-1');
  }
  else
  {
    _ubuntu_report = ksplice_reporting_text();
  }
}

pkgs = [
    {'osver': '21.04', 'pkgname': 'linux-image-5.11.0-1005-azure', 'pkgver': '5.11.0-1005.5'},
    {'osver': '21.04', 'pkgname': 'linux-image-5.11.0-1006-oracle', 'pkgver': '5.11.0-1006.6'},
    {'osver': '21.04', 'pkgname': 'linux-image-5.11.0-1007-aws', 'pkgver': '5.11.0-1007.7'},
    {'osver': '21.04', 'pkgname': 'linux-image-5.11.0-1007-gcp', 'pkgver': '5.11.0-1007.7'},
    {'osver': '21.04', 'pkgname': 'linux-image-5.11.0-1007-kvm', 'pkgver': '5.11.0-1007.7'},
    {'osver': '21.04', 'pkgname': 'linux-image-5.11.0-1008-raspi', 'pkgver': '5.11.0-1008.8'},
    {'osver': '21.04', 'pkgname': 'linux-image-5.11.0-1008-raspi-nolpae', 'pkgver': '5.11.0-1008.8'},
    {'osver': '21.04', 'pkgname': 'linux-image-5.11.0-17-generic', 'pkgver': '5.11.0-17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-5.11.0-17-generic-64k', 'pkgver': '5.11.0-17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-5.11.0-17-generic-lpae', 'pkgver': '5.11.0-17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-5.11.0-17-lowlatency', 'pkgver': '5.11.0-17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-aws', 'pkgver': '5.11.0.1007.7'},
    {'osver': '21.04', 'pkgname': 'linux-image-azure', 'pkgver': '5.11.0.1005.5'},
    {'osver': '21.04', 'pkgname': 'linux-image-gcp', 'pkgver': '5.11.0.1007.7'},
    {'osver': '21.04', 'pkgname': 'linux-image-generic', 'pkgver': '5.11.0.17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-generic-64k', 'pkgver': '5.11.0.17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-generic-64k-hwe-20.04', 'pkgver': '5.11.0.17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-generic-64k-hwe-20.04-edge', 'pkgver': '5.11.0.17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-generic-hwe-20.04', 'pkgver': '5.11.0.17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-generic-hwe-20.04-edge', 'pkgver': '5.11.0.17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-generic-lpae', 'pkgver': '5.11.0.17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-generic-lpae-hwe-20.04', 'pkgver': '5.11.0.17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-generic-lpae-hwe-20.04-edge', 'pkgver': '5.11.0.17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-gke', 'pkgver': '5.11.0.1007.7'},
    {'osver': '21.04', 'pkgname': 'linux-image-kvm', 'pkgver': '5.11.0.1007.7'},
    {'osver': '21.04', 'pkgname': 'linux-image-lowlatency', 'pkgver': '5.11.0.17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-lowlatency-hwe-20.04', 'pkgver': '5.11.0.17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-lowlatency-hwe-20.04-edge', 'pkgver': '5.11.0.17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-oem-20.04', 'pkgver': '5.11.0.17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-oracle', 'pkgver': '5.11.0.1006.6'},
    {'osver': '21.04', 'pkgname': 'linux-image-raspi', 'pkgver': '5.11.0.1008.6'},
    {'osver': '21.04', 'pkgname': 'linux-image-raspi-nolpae', 'pkgver': '5.11.0.1008.6'},
    {'osver': '21.04', 'pkgname': 'linux-image-virtual', 'pkgver': '5.11.0.17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-virtual-hwe-20.04', 'pkgver': '5.11.0.17.18'},
    {'osver': '21.04', 'pkgname': 'linux-image-virtual-hwe-20.04-edge', 'pkgver': '5.11.0.17.18'}
];

flag = 0;
foreach package_array ( pkgs ) {
  osver = NULL;
  pkgname = NULL;
  pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'linux-image-5.11.0-1005-azure / linux-image-5.11.0-1006-oracle / etc');
}

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/ubuntu_USN-4950-1.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\ubuntu_USN-4950-1.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/ubuntu_USN-4950-1.nasl

Go back to menu.

How to Run

Here is how to run the Ubuntu 21.04 : Linux kernel vulnerabilities (USN-4950-1) 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 Ubuntu Local Security Checks plugin family.
On the right side table select Ubuntu 21.04 : Linux kernel vulnerabilities (USN-4950-1) plugin ID 149406.
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 ubuntu_USN-4950-1.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a ubuntu_USN-4950-1.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - ubuntu_USN-4950-1.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 ubuntu_USN-4950-1.nasl -t <IP/HOST>

Go back to menu.

References

USN | Ubuntu Security Notice:

4950-1

See also:

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151205 - SUSE SLES15 Security Update : kernel (SUSE-SU-2021:2208-1)
151986 - SUSE SLES15 Security Update : kernel (SUSE-SU-2021:2421-1)
149407 - Ubuntu 20.04 LTS : Linux kernel (OEM) vulnerabilities (USN-4948-1)
149411 - Ubuntu 20.04 LTS / 20.10 : Linux kernel vulnerabilities (USN-4949-1)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file ubuntu_USN-4950-1.nasl version 1.4. For more plugins, visit the Nessus Plugin Library.

Go back to menu.

Ubuntu 21.04 : Linux kernel vulnerabilities (USN-4950-1) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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