Squid 3.x < 3.2.12 / 3.3.x < 3.3.7 idnsALookup HTTP Request DoS

2013-07-24T00:00:00
ID SQUID_3_2_12.NASL
Type nessus
Reporter This script is Copyright (C) 2013-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2020-01-02T00:00:00

Description

According to its banner, the version of Squid running on the remote host is 3.x prior to 3.2.12 or 3.3.x prior to 3.3.7 and is, therefore, affected by a denial of service vulnerability. A buffer overflow exists in the

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

include("compat.inc");

if (description)
{
  script_id(69041);
  script_version("1.7");
  script_cvs_date("Date: 2019/11/27");

  script_cve_id("CVE-2013-4115");
  script_bugtraq_id(61111);

  script_name(english:"Squid 3.x < 3.2.12 / 3.3.x < 3.3.7 idnsALookup HTTP Request DoS");
  script_summary(english:"Checks version of Squid");

  script_set_attribute(attribute:"synopsis", value:
"The remote proxy server is affected by a denial of service
vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its banner, the version of Squid running on the remote
host is 3.x prior to 3.2.12 or 3.3.x prior to 3.3.7 and is, therefore,
affected by a denial of service vulnerability.  A buffer overflow exists
in the 'idnsALookup' function in the file 'dns_internal.cc' that could
allow specially crafted HTTP requests that could result in a denial of
service.

Note that Nessus has relied only on the version in the proxy server's
banner, which is not updated by the patch that the project has released
to address this issue.  If this patch has been applied properly and the
service has been restarted, consider this to be a false positive.");
  script_set_attribute(attribute:"see_also", value:"http://www.squid-cache.org/Advisories/SQUID-2013_2.txt");
  # http://www.squid-cache.org/Versions/v3/3.0/changesets/squid-3.0-9200.patch
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7d4a3221");
  # http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10487.patch
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?01ebdd34");
  # http://www.squid-cache.org/Versions/v3/3.2/changesets/squid-3.2-11823.patch
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?04f9aba0");
  # http://www.squid-cache.org/Versions/v3/3.3/changesets/squid-3.3-12587.patch
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?89d9d13f");
  script_set_attribute(attribute:"solution", value:
"Either upgrade to Squid version 3.2.12 / 3.3.7 or later, or apply the
vendor-supplied patch.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2013-4115");

  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:"2013/07/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2013/07/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2013/07/24");

  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) 2013-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");

# Build a list of ports from the
list = get_kb_list("http_proxy/*/squid/version");
if (isnull(list)) audit(AUDIT_NOT_INST, "Squid");

# nb: banner checks of open source software are prone to false-
#     positives so only run the check if reporting is paranoid.
if (report_paranoia < 2) audit(AUDIT_PARANOID);

vulnerable = FALSE;
not_vuln_list = make_list();

foreach item (keys(list))
{
  port = ereg_replace(pattern:'^http_proxy/([0-9]+)/squid/version', replace:'\\1', string:item);
  version = list[item];
  # Affected:

  # Squid 3.x < 3.2.12
  # Squid 3.3.x < 3.3.7
  if (
    version =~ "^3\.[0-1]([^0-9]|$)" ||
    version =~ "^3\.2\.([0-9]|1[0-1])([^0-9]|$)" ||
    version =~ "^3\.3\.[0-6]([^0-9]|$)"
  )
  {
    vulnerable = TRUE;
    if (report_verbosity > 0)
    {
      source = get_kb_item('http_proxy/'+port+'/squid/source');
      report =
        '\n  Version source    : ' + source +
        '\n  Installed version : ' + version +
        '\n  Fixed version     : 3.2.12 / 3.3.7' + '\n';
      security_hole(port:port, extra:report);
    }
    else security_hole(port:port);
  }
  else not_vuln_list = make_list(not_vuln_list, version + " on port " + port);
}

if (vulnerable) exit(0);
else
{
  installs = max_index(not_vuln_list);
  if (installs == 0) audit(AUDIT_NOT_INST, "Squid");
  else if (installs == 1)
    audit(AUDIT_INST_VER_NOT_VULN, "Squid", not_vuln_list[0]);
  else
    exit(0, "The Squid installs ("+ join(not_vuln_list, sep:", ") + ") are not affected.");
}