Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : Squid vulnerabilities (USN-8435-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8435-1. 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(321371);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/26");

  script_cve_id("CVE-2026-47729", "CVE-2026-50012");
  script_xref(name:"USN", value:"8435-1");
  script_xref(name:"IAVB", value:"2026-B-0165");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : Squid vulnerabilities (USN-8435-1)");

  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 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-8435-1 advisory.

    It was discovered that Squid incorrectly handled FTP gateway processing under certain circumstances, which
    could result in an out-of-bounds read. A remote attacker could use this issue to cause Squid to crash,
    resulting in a denial of service, or possibly obtain sensitive information. (CVE-2026-47729)

    It was discovered that Squid incorrectly handled cache digest processing under certain circumstances,
    which could result in a heap-based buffer overflow. A remote attacker could use this issue to cause Squid
    to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-50012)

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-8435-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:N/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-2026-50012");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/17");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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:squid");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:squid-cgi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:squid-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:squid-openssl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:squid-purge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:squidclient");
  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");
  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 (! ('22.04' >< os_release || '24.04' >< os_release || '25.10' >< os_release || '26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 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 pkgs = [
    {'osver': '22.04', 'pkgname': 'squid', 'pkgver': '5.9-0ubuntu0.22.04.7'},
    {'osver': '22.04', 'pkgname': 'squid-cgi', 'pkgver': '5.9-0ubuntu0.22.04.7'},
    {'osver': '22.04', 'pkgname': 'squid-common', 'pkgver': '5.9-0ubuntu0.22.04.7'},
    {'osver': '22.04', 'pkgname': 'squid-openssl', 'pkgver': '5.9-0ubuntu0.22.04.7'},
    {'osver': '22.04', 'pkgname': 'squid-purge', 'pkgver': '5.9-0ubuntu0.22.04.7'},
    {'osver': '22.04', 'pkgname': 'squidclient', 'pkgver': '5.9-0ubuntu0.22.04.7'},
    {'osver': '24.04', 'pkgname': 'squid', 'pkgver': '6.14-0ubuntu0.24.04.4'},
    {'osver': '24.04', 'pkgname': 'squid-cgi', 'pkgver': '6.14-0ubuntu0.24.04.4'},
    {'osver': '24.04', 'pkgname': 'squid-common', 'pkgver': '6.14-0ubuntu0.24.04.4'},
    {'osver': '24.04', 'pkgname': 'squid-openssl', 'pkgver': '6.14-0ubuntu0.24.04.4'},
    {'osver': '24.04', 'pkgname': 'squid-purge', 'pkgver': '6.14-0ubuntu0.24.04.4'},
    {'osver': '24.04', 'pkgname': 'squidclient', 'pkgver': '6.14-0ubuntu0.24.04.4'},
    {'osver': '25.10', 'pkgname': 'squid', 'pkgver': '6.14-0ubuntu0.25.10.4'},
    {'osver': '25.10', 'pkgname': 'squid-cgi', 'pkgver': '6.14-0ubuntu0.25.10.4'},
    {'osver': '25.10', 'pkgname': 'squid-common', 'pkgver': '6.14-0ubuntu0.25.10.4'},
    {'osver': '25.10', 'pkgname': 'squid-openssl', 'pkgver': '6.14-0ubuntu0.25.10.4'},
    {'osver': '25.10', 'pkgname': 'squid-purge', 'pkgver': '6.14-0ubuntu0.25.10.4'},
    {'osver': '25.10', 'pkgname': 'squidclient', 'pkgver': '6.14-0ubuntu0.25.10.4'},
    {'osver': '26.04', 'pkgname': 'squid', 'pkgver': '7.2-2ubuntu2.2'},
    {'osver': '26.04', 'pkgname': 'squid-common', 'pkgver': '7.2-2ubuntu2.2'},
    {'osver': '26.04', 'pkgname': 'squid-openssl', 'pkgver': '7.2-2ubuntu2.2'}
];

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_WARNING,
    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, 'squid / squid-cgi / squid-common / squid-openssl / squid-purge / etc');
}