Squid < 3.1.4 External Auth Header Parser DoS Vulnerabilities

# SPDX-FileCopyrightText: 2009 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

CPE = "cpe:/a:squid-cache:squid";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.101105");
  script_version("2025-03-05T05:38:52+0000");
  script_tag(name:"last_modification", value:"2025-03-05 05:38:52 +0000 (Wed, 05 Mar 2025)");
  script_tag(name:"creation_date", value:"2009-08-24 07:49:31 +0200 (Mon, 24 Aug 2009)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_cve_id("CVE-2009-2855");
  script_name("Squid < 3.1.4 External Auth Header Parser DoS Vulnerabilities");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2009 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("gb_squid_http_detect.nasl");
  script_mandatory_keys("squid/detected");

  script_xref(name:"URL", value:"http://www.squid-cache.org/bugs/show_bug.cgi?id=2704");
  script_xref(name:"URL", value:"http://www.openwall.com/lists/oss-security/2009/08/03/3");
  script_xref(name:"URL", value:"http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=534982");

  script_tag(name:"impact", value:"Successful exploitation could allow remote attackers to cause a
  denial of service via a crafted auth header with certain comma delimiters that trigger an infinite
  loop of calls to the strcspn function.");

  script_tag(name:"affected", value:"Squid version 2.7.x.");

  script_tag(name:"insight", value:"The flaw is due to error in 'strListGetItem()' function within
  'src/HttpHeaderTools.c'.");

  script_tag(name:"solution", value:"Update to version 3.1.4 or later.");

  script_tag(name:"summary", value:"Squid is prone to multiple denial of service (DoS)
  vulnerabilities.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"remote_banner_unreliable");

  exit(0);
}

include("host_details.inc");
include("version_func.inc");

if( ! port = get_app_port( cpe:CPE ) )
  exit( 0 );

if( ! vers = get_app_version( cpe:CPE, port:port ) )
  exit( 0 );

if( vers =~ "^2\.7" ) {
  report = report_fixed_ver( installed_version:vers, fixed_version:"3.1.4" );
  security_message( port:port, data:report );
  exit( 0 );
}

exit( 99 );