Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : Ubuntu Advantage Tools (pro client) vulnerabilities (USN-8555-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8555-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(327616);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/18");

  script_cve_id("CVE-2026-9494", "CVE-2026-11386", "CVE-2026-12391");
  script_xref(name:"USN", value:"8555-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : Ubuntu Advantage Tools (pro client) vulnerabilities (USN-8555-1)");

  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 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages
installed that are affected by multiple vulnerabilities as referenced in the USN-8555-1 advisory.

    Bilal Teke discovered that Ubuntu Advantage Tools exposed the Pro bearer token in command-line arguments
    when validating APT credentials. A local attacker could possibly use this issue to obtain sensitive
    information and gain unauthorized access to Ubuntu Pro repositories. (CVE-2026-9494)

    Frederick Jerusha discovered that Ubuntu Advantage Tools did not properly validate data received from the
    contract server when writing APT source files. An attacker could possibly use this issue to inject
    arbitrary APT configuration and execute arbitrary code. (CVE-2026-11386)

    Mateusz Gierblinski discovered that Ubuntu Advantage Tools did not properly handle symbolic links when
    collecting diagnostic logs. A local attacker could possibly use this issue to obtain sensitive information
    from files owned by the administrator. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu
    20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-12391)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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://ubuntu.com/security/notices/USN-8555-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/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:N/AC:H/PR:N/UI:N/S:C/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-2026-11386");

  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:"2026/07/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/17");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  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:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ubuntu-advantage-pro");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ubuntu-advantage-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ubuntu-pro-auto-attach");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ubuntu-pro-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ubuntu-pro-client-l10n");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2026 Canonical, Inc. / NASL script (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('14.04' >< os_release || '16.04' >< os_release || '18.04' >< os_release || '20.04' >< os_release || '22.04' >< os_release || '24.04' >< os_release || '26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 16.04 / 18.04 / 20.04 / 22.04 / 24.04 / 26.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) 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, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '14.04', 'pkgname': 'ubuntu-advantage-tools', 'pkgver': '19.7ubuntu0.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386']},
    {'osver': '16.04', 'pkgname': 'ubuntu-advantage-pro', 'pkgver': '37.1ubuntu0~16.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '16.04', 'pkgname': 'ubuntu-advantage-tools', 'pkgver': '37.1ubuntu0~16.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '16.04', 'pkgname': 'ubuntu-pro-auto-attach', 'pkgver': '37.1ubuntu0~16.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '16.04', 'pkgname': 'ubuntu-pro-client', 'pkgver': '37.1ubuntu0~16.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '16.04', 'pkgname': 'ubuntu-pro-client-l10n', 'pkgver': '37.1ubuntu0~16.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '18.04', 'pkgname': 'ubuntu-advantage-pro', 'pkgver': '37.1ubuntu0~18.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '18.04', 'pkgname': 'ubuntu-advantage-tools', 'pkgver': '37.1ubuntu0~18.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '18.04', 'pkgname': 'ubuntu-pro-auto-attach', 'pkgver': '37.1ubuntu0~18.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '18.04', 'pkgname': 'ubuntu-pro-client', 'pkgver': '37.1ubuntu0~18.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '18.04', 'pkgname': 'ubuntu-pro-client-l10n', 'pkgver': '37.1ubuntu0~18.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '20.04', 'pkgname': 'ubuntu-advantage-pro', 'pkgver': '37.1ubuntu0~20.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '20.04', 'pkgname': 'ubuntu-advantage-tools', 'pkgver': '37.1ubuntu0~20.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '20.04', 'pkgname': 'ubuntu-pro-auto-attach', 'pkgver': '37.1ubuntu0~20.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '20.04', 'pkgname': 'ubuntu-pro-client', 'pkgver': '37.1ubuntu0~20.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '20.04', 'pkgname': 'ubuntu-pro-client-l10n', 'pkgver': '37.1ubuntu0~20.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '22.04', 'pkgname': 'ubuntu-advantage-pro', 'pkgver': '37.2ubuntu~22.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '22.04', 'pkgname': 'ubuntu-advantage-tools', 'pkgver': '37.2ubuntu~22.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '22.04', 'pkgname': 'ubuntu-pro-auto-attach', 'pkgver': '37.2ubuntu~22.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '22.04', 'pkgname': 'ubuntu-pro-client', 'pkgver': '37.2ubuntu~22.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '22.04', 'pkgname': 'ubuntu-pro-client-l10n', 'pkgver': '37.2ubuntu~22.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '24.04', 'pkgname': 'ubuntu-advantage-pro', 'pkgver': '37.2ubuntu~24.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '24.04', 'pkgname': 'ubuntu-advantage-tools', 'pkgver': '37.2ubuntu~24.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '24.04', 'pkgname': 'ubuntu-pro-auto-attach', 'pkgver': '37.2ubuntu~24.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '24.04', 'pkgname': 'ubuntu-pro-client', 'pkgver': '37.2ubuntu~24.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '24.04', 'pkgname': 'ubuntu-pro-client-l10n', 'pkgver': '37.2ubuntu~24.04.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '26.04', 'pkgname': 'ubuntu-advantage-pro', 'pkgver': '37.2ubuntu0.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '26.04', 'pkgname': 'ubuntu-advantage-tools', 'pkgver': '37.2ubuntu0.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '26.04', 'pkgname': 'ubuntu-pro-auto-attach', 'pkgver': '37.2ubuntu0.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '26.04', 'pkgname': 'ubuntu-pro-client', 'pkgver': '37.2ubuntu0.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']},
    {'osver': '26.04', 'pkgname': 'ubuntu-pro-client-l10n', 'pkgver': '37.2ubuntu0.1', 'cves': ['CVE-2026-9494', 'CVE-2026-11386', 'CVE-2026-12391']}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var 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 (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ubuntu-advantage-pro / ubuntu-advantage-tools / etc');
}