Squid 3.x < 3.5.28 / 4.x < 4.0.23 Multiple Denial of Service Vulnerabilities (SQUID-2018:1) (SQUID-2018:2)

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(119724);
  script_version("1.2");
  script_cvs_date("Date: 2019/10/31 15:18:51");

  script_cve_id("CVE-2018-1000024", "CVE-2018-1000027");

  script_name(english:"Squid 3.x < 3.5.28 / 4.x < 4.0.23 Multiple Denial of Service Vulnerabilities (SQUID-2018:1) (SQUID-2018:2)");
  script_summary(english:"Checks the version of Squid.");

  script_set_attribute(attribute:"synopsis", value:
"The remote proxy server is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its banner, the version of Squid running on the remote
host is 3.x prior to 3.5.28, or 4.x prior to 4.0.23. It
is, therefore, affected by multiple vulnerabilities:

  - A denial of service (DoS) vulnerability exists in the ESI
    response processing component due to incorrect pointer handling.
    A remote attacker controlled server can exploit this issue, via a
    crafted ESI response, to cause a denial of service for all
    clients accessing the Squid service (CVE-2018-1000024)

  - A denial of service (DoS) vulnerability exists in the HTTP
    message processing component due to incorrect pointer handling.
    An unauthenticated remote attacker can exploit this issue, via a
    crafted HTTP request, to cause a denial of service for all
    clients accessing the Squid service (CVE-2018-1000027)

Note that Nessus has not tested for this issue but has instead
relied only on the application's self-reported version number.");
  script_set_attribute(attribute:"see_also", value:"http://www.squid-cache.org/Advisories/SQUID-2018_1.txt");
  script_set_attribute(attribute:"see_also", value:"http://www.squid-cache.org/Advisories/SQUID-2018_2.txt");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Squid version 3.5.28 or 4.0.23 or later. Alternatively,
apply the vendor-supplied patch.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  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:N/I:N/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-2018-1000024");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/01/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/01/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/12/17");

  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_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2018-2019 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("vcf.inc");
include("http.inc");

app = "Squid";
get_install_count(app_name:app, exit_if_zero:TRUE);

if (report_paranoia < 2) audit(AUDIT_PARANOID);

port = get_http_port(default:3128);

app_info = vcf::get_app_info(app:app, port:port, webapp:TRUE);

# Affected versions:  Squid 3.x -> 3.5.27
#                     Squid 4.x -> 4.0.22
# Fixed in version:   Squid 3.5.28, 4.0.23
constraints = [
  {"min_version":"3.0", "fixed_version":"3.5.28"},
  {"min_version":"4.0", "fixed_version":"4.0.23"}
];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);