Squid < 7.5 Multiple Vulnerabilities

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(303933);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/31");

  script_cve_id("CVE-2026-32748", "CVE-2026-33515", "CVE-2026-33526");
  script_xref(name:"IAVB", value:"2026-B-0076");

  script_name(english:"Squid < 7.5 Multiple Vulnerabilities");

  script_set_attribute(attribute:"synopsis", value:
"The remote proxy server is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Squid on the remote host is prior to 7.5. It is, therefore, affected by multiple
vulnerabilities:

  - Due to heap Use-After-Free, Squid is vulnerable to Denial of Service when handling ICP traffic. This attack is
    limited to Squid deployments that explicitly enable ICP support. (CVE-2026-33526)

  - Due to improper input validation, Squid is vulnerable to out of bounds read when handling ICP traffic. This
    allows a remote attacker to receive small amounts of memory potentially containing sensitive information.
    (CVE-2026-33515)

  - Due to premature release of resource during expected lifetime and heap Use-After-Free bugs, Squid is vulnerable
    to Denial of Service when handling ICP traffic. (CVE-2026-32748)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://github.com/squid-cache/squid/security/advisories/GHSA-hpfx-h48q-gvwg
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0b3b7260");
  # https://github.com/squid-cache/squid/security/advisories/GHSA-84p4-hcx7-jj7c
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1eee3cfb");
  # https://github.com/squid-cache/squid/security/advisories/GHSA-f9p7-3jqg-hhvq
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3fc3425a");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Squid version 7.5 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N");
  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:L/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/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:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-33515");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-33526");

  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:"2026/03/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/03/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/27");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:squid-cache:squid");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Firewalls");

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

  script_dependencies("squid_version.nasl");
  script_require_keys("installed_sw/Squid", "Settings/ParanoidReport");
  script_require_ports("Services/http_proxy", 3128, 8080);

  exit(0);
}

include('vdf.inc');

if (report_paranoia < 2)
  audit(AUDIT_PARANOID);

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'requires': [
    {'scope': 'target', 'match': {'paranoia': true}}
  ],
  'checks': [
    {
      'product': {'name': 'Squid', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'fixed_version': '7.5'}
      ]
    }
  ]
};

var result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_WARNING);
vdf::handle_check_and_report_errors(vdf_result:result);