Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-5003-1) - Nessus

High Plugin ID: 150952

This page contains detailed information about the Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-5003-1) 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: 150952
Name: Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-5003-1)
Filename: ubuntu_USN-5003-1.nasl
Vulnerability Published: 2021-04-22
This Plugin Published: 2021-06-23
Last Modification Time: 2021-06-23
Plugin Version: 1.2
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 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5003-1 advisory.

- A race condition in Linux kernel SCTP sockets (net/sctp/socket.c) before 5.12-rc8 can lead to kernel privilege escalation from the context of a network service or an unprivileged process. If sctp_destroy_sock is called without sock_net(sk)->sctp.addr_wq_lock then an element is removed from the auto_asconf_splist list without any proper locking. This can be exploited by an attacker with network service privileges to escalate to root or from the context of an unprivileged user directly if a BPF_CGROUP_INET_SOCK_CREATE is attached which denies creation of some SCTP socket. (CVE-2021-23133)

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 Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-5003-1) vulnerability:

GitHub: https://github.com/xairy/linux-kernel-exploitation
[CVE-2021-3609]

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-2021-23133
CVSS V2 Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C/E:U/RL:OF/RC:C

CVSS Base Score:	6.9 (Medium)
Impact Subscore:	10.0
Exploitability Subscore:	3.4
CVSS Temporal Score:	5.1 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	5.1 (Medium)

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

CVSS Base Score:	7.0 (High)
Impact Subscore:	5.9
Exploitability Subscore:	1.0
CVSS Temporal Score:	6.1 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.1 (Medium)

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-5003-1. 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(150952);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/06/23");

  script_cve_id("CVE-2021-3600", "CVE-2021-3609", "CVE-2021-23133");
  script_xref(name:"USN", value:"5003-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-5003-1)");

  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 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as
referenced in the USN-5003-1 advisory.

  - A race condition in Linux kernel SCTP sockets (net/sctp/socket.c) before 5.12-rc8 can lead to kernel
    privilege escalation from the context of a network service or an unprivileged process. If
    sctp_destroy_sock is called without sock_net(sk)->sctp.addr_wq_lock then an element is removed from the
    auto_asconf_splist list without any proper locking. This can be exploited by an attacker with network
    service privileges to escalate to root or from the context of an unprivileged user directly if a
    BPF_CGROUP_INET_SOCK_CREATE is attached which denies creation of some SCTP socket. (CVE-2021-23133)

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-5003-1");
  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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-23133");

  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:"2021/04/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/06/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/06/23");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1022-dell300x");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1075-oracle");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1089-raspi2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1103-gcp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1106-aws");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1106-snapdragon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1118-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-147-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-147-generic-lpae");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-147-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-aws-hwe");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-aws-lts-18.04");
  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-azure-edge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-azure-lts-18.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-dell300x");
  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-gcp-lts-18.04");
  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-hwe-16.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-hwe-16.04-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-16.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae-hwe-16.04-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-lowlatency");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency-hwe-16.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency-hwe-16.04-edge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-oem");
  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-oracle-lts-18.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-raspi2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-snapdragon");
  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-16.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual-hwe-16.04-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:"^(16\.04|18\.04)$", string:release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04', '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-2021-3600', 'CVE-2021-3609', 'CVE-2021-23133');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-5003-1');
  }
  else
  {
    _ubuntu_report = ksplice_reporting_text();
  }
}

pkgs = [
    {'osver': '16.04', 'pkgname': 'linux-image-4.15.0-1075-oracle', 'pkgver': '4.15.0-1075.83~16.04.1'},
    {'osver': '16.04', 'pkgname': 'linux-image-4.15.0-1103-gcp', 'pkgver': '4.15.0-1103.116~16.04.1'},
    {'osver': '16.04', 'pkgname': 'linux-image-4.15.0-1106-aws', 'pkgver': '4.15.0-1106.113~16.04.1'},
    {'osver': '16.04', 'pkgname': 'linux-image-4.15.0-1118-azure', 'pkgver': '4.15.0-1118.131~16.04.1'},
    {'osver': '16.04', 'pkgname': 'linux-image-4.15.0-147-generic', 'pkgver': '4.15.0-147.151~16.04.1'},
    {'osver': '16.04', 'pkgname': 'linux-image-4.15.0-147-lowlatency', 'pkgver': '4.15.0-147.151~16.04.1'},
    {'osver': '16.04', 'pkgname': 'linux-image-aws-hwe', 'pkgver': '4.15.0.1106.97'},
    {'osver': '16.04', 'pkgname': 'linux-image-azure', 'pkgver': '4.15.0.1118.109'},
    {'osver': '16.04', 'pkgname': 'linux-image-azure-edge', 'pkgver': '4.15.0.1118.109'},
    {'osver': '16.04', 'pkgname': 'linux-image-gcp', 'pkgver': '4.15.0.1103.104'},
    {'osver': '16.04', 'pkgname': 'linux-image-generic-hwe-16.04', 'pkgver': '4.15.0.147.143'},
    {'osver': '16.04', 'pkgname': 'linux-image-generic-hwe-16.04-edge', 'pkgver': '4.15.0.147.143'},
    {'osver': '16.04', 'pkgname': 'linux-image-gke', 'pkgver': '4.15.0.1103.104'},
    {'osver': '16.04', 'pkgname': 'linux-image-lowlatency-hwe-16.04', 'pkgver': '4.15.0.147.143'},
    {'osver': '16.04', 'pkgname': 'linux-image-lowlatency-hwe-16.04-edge', 'pkgver': '4.15.0.147.143'},
    {'osver': '16.04', 'pkgname': 'linux-image-oem', 'pkgver': '4.15.0.147.143'},
    {'osver': '16.04', 'pkgname': 'linux-image-oracle', 'pkgver': '4.15.0.1075.63'},
    {'osver': '16.04', 'pkgname': 'linux-image-virtual-hwe-16.04', 'pkgver': '4.15.0.147.143'},
    {'osver': '16.04', 'pkgname': 'linux-image-virtual-hwe-16.04-edge', 'pkgver': '4.15.0.147.143'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-1022-dell300x', 'pkgver': '4.15.0-1022.26'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-1075-oracle', 'pkgver': '4.15.0-1075.83'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-1089-raspi2', 'pkgver': '4.15.0-1089.94'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-1103-gcp', 'pkgver': '4.15.0-1103.116'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-1106-aws', 'pkgver': '4.15.0-1106.113'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-1106-snapdragon', 'pkgver': '4.15.0-1106.115'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-1118-azure', 'pkgver': '4.15.0-1118.131'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-147-generic', 'pkgver': '4.15.0-147.151'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-147-generic-lpae', 'pkgver': '4.15.0-147.151'},
    {'osver': '18.04', 'pkgname': 'linux-image-4.15.0-147-lowlatency', 'pkgver': '4.15.0-147.151'},
    {'osver': '18.04', 'pkgname': 'linux-image-aws-lts-18.04', 'pkgver': '4.15.0.1106.109'},
    {'osver': '18.04', 'pkgname': 'linux-image-azure-lts-18.04', 'pkgver': '4.15.0.1118.91'},
    {'osver': '18.04', 'pkgname': 'linux-image-dell300x', 'pkgver': '4.15.0.1022.24'},
    {'osver': '18.04', 'pkgname': 'linux-image-gcp-lts-18.04', 'pkgver': '4.15.0.1103.121'},
    {'osver': '18.04', 'pkgname': 'linux-image-generic', 'pkgver': '4.15.0.147.134'},
    {'osver': '18.04', 'pkgname': 'linux-image-generic-hwe-16.04', 'pkgver': '4.15.0.147.134'},
    {'osver': '18.04', 'pkgname': 'linux-image-generic-hwe-16.04-edge', 'pkgver': '4.15.0.147.134'},
    {'osver': '18.04', 'pkgname': 'linux-image-generic-lpae', 'pkgver': '4.15.0.147.134'},
    {'osver': '18.04', 'pkgname': 'linux-image-generic-lpae-hwe-16.04', 'pkgver': '4.15.0.147.134'},
    {'osver': '18.04', 'pkgname': 'linux-image-generic-lpae-hwe-16.04-edge', 'pkgver': '4.15.0.147.134'},
    {'osver': '18.04', 'pkgname': 'linux-image-lowlatency', 'pkgver': '4.15.0.147.134'},
    {'osver': '18.04', 'pkgname': 'linux-image-lowlatency-hwe-16.04', 'pkgver': '4.15.0.147.134'},
    {'osver': '18.04', 'pkgname': 'linux-image-lowlatency-hwe-16.04-edge', 'pkgver': '4.15.0.147.134'},
    {'osver': '18.04', 'pkgname': 'linux-image-oracle-lts-18.04', 'pkgver': '4.15.0.1075.85'},
    {'osver': '18.04', 'pkgname': 'linux-image-raspi2', 'pkgver': '4.15.0.1089.86'},
    {'osver': '18.04', 'pkgname': 'linux-image-snapdragon', 'pkgver': '4.15.0.1106.109'},
    {'osver': '18.04', 'pkgname': 'linux-image-virtual', 'pkgver': '4.15.0.147.134'},
    {'osver': '18.04', 'pkgname': 'linux-image-virtual-hwe-16.04', 'pkgver': '4.15.0.147.134'},
    {'osver': '18.04', 'pkgname': 'linux-image-virtual-hwe-16.04-edge', 'pkgver': '4.15.0.147.134'}
];

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_WARNING,
    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-4.15.0-1022-dell300x / linux-image-4.15.0-1075-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-5003-1.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\ubuntu_USN-5003-1.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/ubuntu_USN-5003-1.nasl

Go back to menu.

How to Run

Here is how to run the Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-5003-1) 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 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-5003-1) plugin ID 150952.
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-5003-1.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a ubuntu_USN-5003-1.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-5003-1.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-5003-1.nasl -t <IP/HOST>

Go back to menu.

References

USN | Ubuntu Security Notice:

5003-1

See also:

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Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file ubuntu_USN-5003-1.nasl version 1.2. For more plugins, visit the Nessus Plugin Library.

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Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-5003-1) - Nessus

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Vulnerability Information

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