Debian dla-4697 : squid - security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dla-4697. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(329264);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/23");

  script_cve_id(
    "CVE-2026-33515",
    "CVE-2026-33526",
    "CVE-2026-47729",
    "CVE-2026-50012"
  );
  script_xref(name:"IAVB", value:"2026-B-0076-S");
  script_xref(name:"IAVB", value:"2026-B-0165");

  script_name(english:"Debian dla-4697 : squid - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 11 / 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-4697 advisory.

    - -----------------------------------------------------------------------
    Debian LTS Advisory DLA-4697-1              [email protected]
    https://www.debian.org/lts/security/                      Utkarsh Gupta
    July 24, 2026                               https://wiki.debian.org/LTS
    - -----------------------------------------------------------------------

    Package        : squid
    Version        : 4.13-10+deb11u7 5.7-2+deb12u6
    CVE ID         : CVE-2026-33515 CVE-2026-33526 CVE-2026-47729
                     CVE-2026-50012

    Multiple security issues were discovered in the Squid proxy caching
    server, which could result in information disclosure or denial of
    service.

    For Debian 11 bullseye, these problems have been fixed in version
    4.13-10+deb11u7.

    For Debian 12 bookworm, these problems have been fixed in version
    5.7-2+deb12u6.

    We recommend that you upgrade your squid packages.

    For the detailed security status of squid please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/squid

    Further information about Debian LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian 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://security-tracker.debian.org/tracker/source-package/squid");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-33515");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-33526");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-47729");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-50012");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bookworm/squid");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/squid");
  script_set_attribute(attribute:"solution", value:
"Upgrade the squid 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:"2026/03/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/23");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:squid");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:squid-cgi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:squid-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:squid-openssl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:squid-purge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:squidclient");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  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:"Debian Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/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);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);

var debian_release = get_kb_item('Host/Debian/release');
if ( isnull(debian_release) ) audit(AUDIT_OS_NOT, 'Debian');
debian_release = chomp(debian_release);
if (! preg(pattern:"^(11)\.[0-9]+|^(12)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0 / 12.0', 'Debian ' + debian_release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '11.0', 'prefix': 'squid', 'reference': '4.13-10+deb11u7'},
    {'release': '11.0', 'prefix': 'squid-cgi', 'reference': '4.13-10+deb11u7'},
    {'release': '11.0', 'prefix': 'squid-common', 'reference': '4.13-10+deb11u7'},
    {'release': '11.0', 'prefix': 'squid-openssl', 'reference': '4.13-10+deb11u7'},
    {'release': '11.0', 'prefix': 'squid-purge', 'reference': '4.13-10+deb11u7'},
    {'release': '11.0', 'prefix': 'squidclient', 'reference': '4.13-10+deb11u7'},
    {'release': '12.0', 'prefix': 'squid', 'reference': '5.7-2+deb12u6'},
    {'release': '12.0', 'prefix': 'squid-cgi', 'reference': '5.7-2+deb12u6'},
    {'release': '12.0', 'prefix': 'squid-common', 'reference': '5.7-2+deb12u6'},
    {'release': '12.0', 'prefix': 'squid-openssl', 'reference': '5.7-2+deb12u6'},
    {'release': '12.0', 'prefix': 'squid-purge', 'reference': '5.7-2+deb12u6'},
    {'release': '12.0', 'prefix': 'squidclient', 'reference': '5.7-2+deb12u6'}
];

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

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_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');
}