Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS : Squid vulnerabilities (USN-8941-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8941-1. 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(369509);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/22");

  script_cve_id(
    "CVE-2026-32748",
    "CVE-2026-33515",
    "CVE-2026-33526",
    "CVE-2026-47729",
    "CVE-2026-50012",
    "CVE-2026-61642"
  );
  script_xref(name:"USN", value:"8941-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS : Squid vulnerabilities (USN-8941-1)");

  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 / 20.04 LTS / 22.04 LTS / 24.04 LTS host has packages installed that are
affected by multiple vulnerabilities as referenced in the USN-8941-1 advisory.

    It was discovered that Squid incorrectly handled certain HTTP Transfer- Encoding headers. An attacker
    could possibly use this issue to perform HTTP request smuggling attacks, bypass security mechanisms, or
    poison web caches.

    (CVE-2026-61642)

    It was discovered that Squid incorrectly handled certain cache digest replies, which could lead to a
    buffer overflow. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a
    denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS.
    (CVE-2026-50012)

    It was discovered that Squid incorrectly handled parsing certain FTP directory listings. A remote attacker
    could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 LTS,
    Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-47729)

    It was discovered that Squid incorrectly handled certain ICP traffic. A remote attacker could possibly use
    this issue to cause Squid to crash, resulting in a denial of service. This issue only affected Ubuntu
    16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-32748, CVE-2026-33526)

    It was discovered that Squid incorrectly handled certain ICP requests. A remote attacker could possibly
    use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04
    LTS, and Ubuntu 20.04 LTS. (CVE-2026-33515)

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-8941-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:M/C:N/I:P/A:C");
  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:L/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-50012");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-33515");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-33526");

  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:"2026/10/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/21");

  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:"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:"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:squid3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:squidclient");
  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_info2.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 (! ('16.04' >< os_release || '18.04' >< os_release || '20.04' >< os_release || '22.04' >< os_release || '24.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04 / 20.04 / 22.04 / 24.04', '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': '16.04', 'pkgname': 'squid', 'pkgver': '3.5.12-1ubuntu7.16+esm7', 'cves': ['CVE-2026-32748', 'CVE-2026-33515', 'CVE-2026-33526', 'CVE-2026-47729', 'CVE-2026-50012', 'CVE-2026-61642']},
    {'osver': '16.04', 'pkgname': 'squid-cgi', 'pkgver': '3.5.12-1ubuntu7.16+esm7', 'cves': ['CVE-2026-32748', 'CVE-2026-33515', 'CVE-2026-33526', 'CVE-2026-47729', 'CVE-2026-50012', 'CVE-2026-61642']},
    {'osver': '16.04', 'pkgname': 'squid-common', 'pkgver': '3.5.12-1ubuntu7.16+esm7', 'cves': ['CVE-2026-32748', 'CVE-2026-33515', 'CVE-2026-33526', 'CVE-2026-47729', 'CVE-2026-50012', 'CVE-2026-61642']},
    {'osver': '16.04', 'pkgname': 'squid-purge', 'pkgver': '3.5.12-1ubuntu7.16+esm7', 'cves': ['CVE-2026-32748', 'CVE-2026-33515', 'CVE-2026-33526', 'CVE-2026-47729', 'CVE-2026-50012', 'CVE-2026-61642']},
    {'osver': '16.04', 'pkgname': 'squid3', 'pkgver': '3.5.12-1ubuntu7.16+esm7', 'cves': ['CVE-2026-32748', 'CVE-2026-33515', 'CVE-2026-33526', 'CVE-2026-47729', 'CVE-2026-50012', 'CVE-2026-61642']},
    {'osver': '16.04', 'pkgname': 'squidclient', 'pkgver': '3.5.12-1ubuntu7.16+esm7', 'cves': ['CVE-2026-32748', 'CVE-2026-33515', 'CVE-2026-33526', 'CVE-2026-47729', 'CVE-2026-50012', 'CVE-2026-61642']},
    {'osver': '18.04', 'pkgname': 'squid', 'pkgver': '3.5.27-1ubuntu1.14+esm6', 'cves': ['CVE-2026-32748', 'CVE-2026-33515', 'CVE-2026-33526', 'CVE-2026-47729', 'CVE-2026-50012', 'CVE-2026-61642']},
    {'osver': '18.04', 'pkgname': 'squid-cgi', 'pkgver': '3.5.27-1ubuntu1.14+esm6', 'cves': ['CVE-2026-32748', 'CVE-2026-33515', 'CVE-2026-33526', 'CVE-2026-47729', 'CVE-2026-50012', 'CVE-2026-61642']},
    {'osver': '18.04', 'pkgname': 'squid-common', 'pkgver': '3.5.27-1ubuntu1.14+esm6', 'cves': ['CVE-2026-32748', 'CVE-2026-33515', 'CVE-2026-33526', 'CVE-2026-47729', 'CVE-2026-50012', 'CVE-2026-61642']},
    {'osver': '18.04', 'pkgname': 'squid-purge', 'pkgver': '3.5.27-1ubuntu1.14+esm6', 'cves': ['CVE-2026-32748', 'CVE-2026-33515', 'CVE-2026-33526', 'CVE-2026-47729', 'CVE-2026-50012', 'CVE-2026-61642']},
    {'osver': '18.04', 'pkgname': 'squid3', 'pkgver': '3.5.27-1ubuntu1.14+esm6', 'cves': ['CVE-2026-32748', 'CVE-2026-33515', 'CVE-2026-33526', 'CVE-2026-47729', 'CVE-2026-50012', 'CVE-2026-61642']},
    {'osver': '18.04', 'pkgname': 'squidclient', 'pkgver': '3.5.27-1ubuntu1.14+esm6', 'cves': ['CVE-2026-32748', 'CVE-2026-33515', 'CVE-2026-33526', 'CVE-2026-47729', 'CVE-2026-50012', 'CVE-2026-61642']},
    {'osver': '20.04', 'pkgname': 'squid', 'pkgver': '4.10-1ubuntu1.13+esm3', 'cves': ['CVE-2026-32748', 'CVE-2026-33515', 'CVE-2026-33526', 'CVE-2026-47729', 'CVE-2026-50012', 'CVE-2026-61642']},
    {'osver': '20.04', 'pkgname': 'squid-cgi', 'pkgver': '4.10-1ubuntu1.13+esm3', 'cves': ['CVE-2026-32748', 'CVE-2026-33515', 'CVE-2026-33526', 'CVE-2026-47729', 'CVE-2026-50012', 'CVE-2026-61642']},
    {'osver': '20.04', 'pkgname': 'squid-common', 'pkgver': '4.10-1ubuntu1.13+esm3', 'cves': ['CVE-2026-32748', 'CVE-2026-33515', 'CVE-2026-33526', 'CVE-2026-47729', 'CVE-2026-50012', 'CVE-2026-61642']},
    {'osver': '20.04', 'pkgname': 'squid-purge', 'pkgver': '4.10-1ubuntu1.13+esm3', 'cves': ['CVE-2026-32748', 'CVE-2026-33515', 'CVE-2026-33526', 'CVE-2026-47729', 'CVE-2026-50012', 'CVE-2026-61642']},
    {'osver': '20.04', 'pkgname': 'squidclient', 'pkgver': '4.10-1ubuntu1.13+esm3', 'cves': ['CVE-2026-32748', 'CVE-2026-33515', 'CVE-2026-33526', 'CVE-2026-47729', 'CVE-2026-50012', 'CVE-2026-61642']},
    {'osver': '22.04', 'pkgname': 'squid', 'pkgver': '5.9-0ubuntu0.22.04.8', 'cves': ['CVE-2026-61642']},
    {'osver': '22.04', 'pkgname': 'squid-cgi', 'pkgver': '5.9-0ubuntu0.22.04.8', 'cves': ['CVE-2026-61642']},
    {'osver': '22.04', 'pkgname': 'squid-common', 'pkgver': '5.9-0ubuntu0.22.04.8', 'cves': ['CVE-2026-61642']},
    {'osver': '22.04', 'pkgname': 'squid-openssl', 'pkgver': '5.9-0ubuntu0.22.04.8', 'cves': ['CVE-2026-61642']},
    {'osver': '22.04', 'pkgname': 'squid-purge', 'pkgver': '5.9-0ubuntu0.22.04.8', 'cves': ['CVE-2026-61642']},
    {'osver': '22.04', 'pkgname': 'squidclient', 'pkgver': '5.9-0ubuntu0.22.04.8', 'cves': ['CVE-2026-61642']},
    {'osver': '24.04', 'pkgname': 'squid', 'pkgver': '6.14-0ubuntu0.24.04.5', 'cves': ['CVE-2026-61642']},
    {'osver': '24.04', 'pkgname': 'squid-cgi', 'pkgver': '6.14-0ubuntu0.24.04.5', 'cves': ['CVE-2026-61642']},
    {'osver': '24.04', 'pkgname': 'squid-common', 'pkgver': '6.14-0ubuntu0.24.04.5', 'cves': ['CVE-2026-61642']},
    {'osver': '24.04', 'pkgname': 'squid-openssl', 'pkgver': '6.14-0ubuntu0.24.04.5', 'cves': ['CVE-2026-61642']},
    {'osver': '24.04', 'pkgname': 'squid-purge', 'pkgver': '6.14-0ubuntu0.24.04.5', 'cves': ['CVE-2026-61642']},
    {'osver': '24.04', 'pkgname': 'squidclient', 'pkgver': '6.14-0ubuntu0.24.04.5', 'cves': ['CVE-2026-61642']}
];

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');
}