Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : libarchive vulnerabilities (USN-8292-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8292-1. 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(316487);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/22");

  script_cve_id("CVE-2026-4424", "CVE-2026-4426", "CVE-2026-5121");
  script_xref(name:"IAVA", value:"2026-A-0270");
  script_xref(name:"USN", value:"8292-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : libarchive vulnerabilities (USN-8292-1)");

  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 / 25.10 / 26.04 LTS host has
packages installed that are affected by multiple vulnerabilities as referenced in the USN-8292-1 advisory.

    It was discovered that libarchive incorrectly handled certain RAR archives. An attacker could possibly use
    this issue to cause an out-of-bounds read via a crafted RAR archive, leading to sensitive memory
    disclosure. (CVE-2026-4424)

    It was discovered that libarchive incorrectly handled certain ISO files. An attacker could possibly use
    this issue to cause incorrect memory allocation via a crafted ISO file, leading to a denial of service.
    (CVE-2026-4426)

    It was discovered that libarchive incorrectly handled block pointer allocation in zisofs on 32-bit
    systems. An attacker could possibly use this issue to cause a heap buffer overflow via a crafted ISO9660
    image, possibly leading to arbitrary code execution. (CVE-2026-5121)

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-8292-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/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:L/PR:N/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-2026-5121");

  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:"2026/03/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/05/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/22");

  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:25.10");
  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:bsdcpio");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:bsdtar");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libarchive-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libarchive-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libarchive13");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libarchive13t64");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  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", "ubuntu_pro_sub_detect.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 || '25.10' >< os_release || '26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 16.04 / 18.04 / 20.04 / 22.04 / 24.04 / 25.10 / 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 ubuntu_pro_detected = get_kb_item('Host/Ubuntu/Pro/Services/esm-apps');
ubuntu_pro_detected = !empty_or_null(ubuntu_pro_detected);

var pro_caveat_needed = FALSE;

var pkgs = [
    {'osver': '14.04', 'pkgname': 'bsdcpio', 'pkgver': '3.1.2-7ubuntu2.8+esm5', 'ubuntu_pro': TRUE},
    {'osver': '14.04', 'pkgname': 'bsdtar', 'pkgver': '3.1.2-7ubuntu2.8+esm5', 'ubuntu_pro': TRUE},
    {'osver': '14.04', 'pkgname': 'libarchive-dev', 'pkgver': '3.1.2-7ubuntu2.8+esm5', 'ubuntu_pro': TRUE},
    {'osver': '14.04', 'pkgname': 'libarchive13', 'pkgver': '3.1.2-7ubuntu2.8+esm5', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'bsdcpio', 'pkgver': '3.1.2-11ubuntu0.16.04.8+esm3', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'bsdtar', 'pkgver': '3.1.2-11ubuntu0.16.04.8+esm3', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'libarchive-dev', 'pkgver': '3.1.2-11ubuntu0.16.04.8+esm3', 'ubuntu_pro': TRUE},
    {'osver': '16.04', 'pkgname': 'libarchive13', 'pkgver': '3.1.2-11ubuntu0.16.04.8+esm3', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'bsdcpio', 'pkgver': '3.2.2-3.1ubuntu0.7+esm3', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'bsdtar', 'pkgver': '3.2.2-3.1ubuntu0.7+esm3', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'libarchive-dev', 'pkgver': '3.2.2-3.1ubuntu0.7+esm3', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'libarchive-tools', 'pkgver': '3.2.2-3.1ubuntu0.7+esm3', 'ubuntu_pro': TRUE},
    {'osver': '18.04', 'pkgname': 'libarchive13', 'pkgver': '3.2.2-3.1ubuntu0.7+esm3', 'ubuntu_pro': TRUE},
    {'osver': '20.04', 'pkgname': 'libarchive-dev', 'pkgver': '3.4.0-2ubuntu1.5+esm2', 'ubuntu_pro': TRUE},
    {'osver': '20.04', 'pkgname': 'libarchive-tools', 'pkgver': '3.4.0-2ubuntu1.5+esm2', 'ubuntu_pro': TRUE},
    {'osver': '20.04', 'pkgname': 'libarchive13', 'pkgver': '3.4.0-2ubuntu1.5+esm2', 'ubuntu_pro': TRUE},
    {'osver': '22.04', 'pkgname': 'libarchive-dev', 'pkgver': '3.6.0-1ubuntu1.7', 'ubuntu_pro': FALSE},
    {'osver': '22.04', 'pkgname': 'libarchive-tools', 'pkgver': '3.6.0-1ubuntu1.7', 'ubuntu_pro': FALSE},
    {'osver': '22.04', 'pkgname': 'libarchive13', 'pkgver': '3.6.0-1ubuntu1.7', 'ubuntu_pro': FALSE},
    {'osver': '24.04', 'pkgname': 'libarchive-dev', 'pkgver': '3.7.2-2ubuntu0.7', 'ubuntu_pro': FALSE},
    {'osver': '24.04', 'pkgname': 'libarchive-tools', 'pkgver': '3.7.2-2ubuntu0.7', 'ubuntu_pro': FALSE},
    {'osver': '24.04', 'pkgname': 'libarchive13t64', 'pkgver': '3.7.2-2ubuntu0.7', 'ubuntu_pro': FALSE},
    {'osver': '25.10', 'pkgname': 'libarchive-dev', 'pkgver': '3.7.7-0ubuntu3.2', 'ubuntu_pro': FALSE},
    {'osver': '25.10', 'pkgname': 'libarchive-tools', 'pkgver': '3.7.7-0ubuntu3.2', 'ubuntu_pro': FALSE},
    {'osver': '25.10', 'pkgname': 'libarchive13t64', 'pkgver': '3.7.7-0ubuntu3.2', 'ubuntu_pro': FALSE},
    {'osver': '26.04', 'pkgname': 'libarchive-dev', 'pkgver': '3.8.5-1ubuntu2.1', 'ubuntu_pro': FALSE},
    {'osver': '26.04', 'pkgname': 'libarchive-tools', 'pkgver': '3.8.5-1ubuntu2.1', 'ubuntu_pro': FALSE},
    {'osver': '26.04', 'pkgname': 'libarchive13t64', 'pkgver': '3.8.5-1ubuntu2.1', 'ubuntu_pro': FALSE}
];

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

if (flag)
{
  var extra = '';
  if (pro_caveat_needed) {
    extra += 'NOTE: This vulnerability check contains fixes that apply to packages only \n';
    extra += 'available in Ubuntu ESM repositories. Access to these package security updates \n';
    extra += 'require an Ubuntu Pro subscription.\n\n';
  }
  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, 'bsdcpio / bsdtar / libarchive-dev / libarchive-tools / libarchive13 / etc');
}