Debian dla-4312 : 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-4312. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(266025);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/30");

  script_cve_id("CVE-2023-5824", "CVE-2023-46728", "CVE-2025-54574");
  script_xref(name:"IAVB", value:"2024-B-0168-S");

  script_name(english:"Debian dla-4312 : 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 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-4312 advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4312-1                [email protected]
    https://www.debian.org/lts/security/                   Bastien Roucaris
    September 27, 2025                            https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : squid
    Version        : 4.13-10+deb11u5
    CVE ID         : CVE-2023-5824 CVE-2023-46728 CVE-2025-54574
    Debian Bug     : 1055249

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

    CVE-2023-5824

        A flaw was found in Squid. The limits applied for validation of HTTP
        response headers are applied before caching. However,
        Squid may grow a cached HTTP response header beyond the configured
        maximum size, causing a stall or crash of the worker process when a
        large header is retrieved from the disk cache, resulting in a denial
        of service.

    CVE-2023-46728

        Due to a NULL pointer dereference bug Squid is vulnerable to a
        Denial of Service attack against Squid's Gopher gateway.
        The obsolete gopher protocol, even if non functional,
        was always available and enabled.
        Responses triggering this bug are possible to be received
        from any gopher server, even those without malicious intent.
        Gopher support (already non functional) has been removed to fix
        this CVE.
        Note that gopher was deprecated and major browsers removed it,
        long time ago.

    CVE-2025-54574

        Squid is vulnerable to a heap buffer overflow and possible remote
        code execution (RCE) attack when processing URN due to incorrect
        buffer management.

    For Debian 11 bullseye, these problems have been fixed in version
    4.13-10+deb11u5.

    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-2023-46728");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2023-5824");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-54574");
  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: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-2025-54574");

  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:"2023/11/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/09/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/09/27");

  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:"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) 2025-2026 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]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0', '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+deb11u5'},
    {'release': '11.0', 'prefix': 'squid-cgi', 'reference': '4.13-10+deb11u5'},
    {'release': '11.0', 'prefix': 'squid-common', 'reference': '4.13-10+deb11u5'},
    {'release': '11.0', 'prefix': 'squid-openssl', 'reference': '4.13-10+deb11u5'},
    {'release': '11.0', 'prefix': 'squid-purge', 'reference': '4.13-10+deb11u5'},
    {'release': '11.0', 'prefix': 'squidclient', 'reference': '4.13-10+deb11u5'}
];

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_HOLE,
    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');
}