Squid Information Disclosure Vulnerability (SQUID-2020:12)

# Copyright (C) 2021 Greenbone Networks GmbH
# 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-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.113797");
  script_version("2022-07-20T10:33:02+0000");
  script_tag(name:"last_modification", value:"2022-07-20 10:33:02 +0000 (Wed, 20 Jul 2022)");
  script_tag(name:"creation_date", value:"2021-03-10 09:45:36 +0000 (Wed, 10 Mar 2021)");
  script_tag(name:"cvss_base", value:"4.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:P/I:N/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-06-11 03:15:00 +0000 (Fri, 11 Jun 2021)");

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

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

  script_cve_id("CVE-2021-28116");

  script_name("Squid Information Disclosure Vulnerability (SQUID-2020:12)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
  script_family("Web Servers");
  script_dependencies("gb_squid_http_detect.nasl");
  script_mandatory_keys("squid/detected");

  script_tag(name:"summary", value:"Squid is prone to an information disclosure vulnerability.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"insight", value:"The vulnerability exists because of an out-of-bounds read
  in WCCP protocol data.");

  script_tag(name:"impact", value:"Successful exploitation would allow an attacker to
  read sensitive information.");

  script_tag(name:"affected", value:"Squid proxy version 2.6 through 2.7.STABLE9, 3.x through 3.5.28,
  4.x through 4.16 and 5.x through 5.1.");

  script_tag(name:"solution", value:"Update to version 4.17, 5.2 or later.");

  script_xref(name:"URL", value:"https://www.openwall.com/lists/oss-security/2021/10/04/1");
  script_xref(name:"URL", value:"https://www.zerodayinitiative.com/advisories/ZDI-21-157/");

  exit(0);
}

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

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

if( ! port = get_app_port( cpe: CPE ) ) exit( 0 );
if( ! infos = get_app_version_and_location( cpe: CPE, port: port, exit_no_version: TRUE ) ) exit( 0 );

version = infos["version"];
location = infos["location"];

if( version_is_less( version: version, test_version: "4.17" ) ) {
  report = report_fixed_ver( installed_version: version, fixed_version: "4.17", install_path: location );
  security_message( data: report, port: port );
  exit( 0 );
}

if( version_in_range( version: version, test_version: "5.0.0", test_version2: "5.1" ) ) {
  report = report_fixed_ver( installed_version: version, fixed_version: "5.2", install_path: location );
  security_message( data: report, port: port );
  exit( 0 );
}

exit( 99 );