FreeBSD : shibboleth-sp -- vulnerable to forged user attribute data (22438240-1bd0-11e8-a2ec-6cc21735f730)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from the FreeBSD VuXML database :
#
# Copyright 2003-2018 Jacques Vidrine and contributors
#
# Redistribution and use in source (VuXML) and 'compiled' forms (SGML,
# HTML, PDF, PostScript, RTF and so forth) with or without modification,
# are permitted provided that the following conditions are met:
# 1. Redistributions of source code (VuXML) must retain the above
#    copyright notice, this list of conditions and the following
#    disclaimer as the first lines of this file unmodified.
# 2. Redistributions in compiled form (transformed to other DTDs,
#    published online in any format, converted to PDF, PostScript,
#    RTF and other formats) must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer
#    in the documentation and/or other materials provided with the
#    distribution.
# 
# THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
# OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION,
# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

include("compat.inc");

if (description)
{
  script_id(107042);
  script_version("3.5");
  script_cvs_date("Date: 2018/11/10 11:49:46");

  script_cve_id("CVE-2018-0489");
  script_xref(name:"IAVB", value:"2018-B-0038");

  script_name(english:"FreeBSD : shibboleth-sp -- vulnerable to forged user attribute data (22438240-1bd0-11e8-a2ec-6cc21735f730)");
  script_summary(english:"Checks for updated packages in pkg_info output");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote FreeBSD host is missing one or more security-related
updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Shibboleth consortium reports :

Shibboleth SP software vulnerable to additional data forgery flaws

The XML processing performed by the Service Provider software has been
found to be vulnerable to new flaws similar in nature to the one
addressed in an advisory last month.

These bugs involve the use of other XML constructs rather than entity
references, and therefore required additional mitigation once
discovered. As with the previous issue, this flaw allows for changes
to an XML document that do not break a digital signature but can alter
the user data passed through to applications behind the SP and result
in impersonation attacks and exposure of protected information.

As before, the use of XML Encryption is a significant mitigation, but
we have not dismissed the possibility that attacks on the Response
'envelope' may be possible, in both the original and this new case. No
actual attacks of this nature are known, so deployers should
prioritize patching systems that expect to handle unencrypted SAML
assertions.

An updated version of XMLTooling-C (V1.6.4) is available that protects
against these new attacks, and should help prevent similar
vulnerabilities in the future.

Unlike the previous case, these bugs are NOT prevented by any existing
Xerces-C parser version on any platform and cannot be addressed by any
means other than the updated XMLTooling-C library.

The Service Provider software relies on a generic XML parser to
process SAML responses and there are limitations in older versions of
the parser that make it impossible to fully disable Document Type
Definition (DTD) processing.

Through addition/manipulation of a DTD, it's possible to make changes
to an XML document that do not break a digital signature but are
mishandled by the SP and its libraries. These manipulations can alter
the user data passed through to applications behind the SP and result
in impersonation attacks and exposure of protected information.

While newer versions of the xerces-c3 parser are configured by the SP
into disallowing the use of a DTD via an environment variable, this
feature is not present in the xerces-c3 parser before version 3.1.4,
so an additional fix is being provided now that an actual DTD exploit
has been identified. Xerces-c3-3.1.4 was committed to the ports tree
already on 2016-07-26."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://shibboleth.net/community/advisories/secadv_20180227.txt"
  );
  # https://vuxml.freebsd.org/freebsd/22438240-1bd0-11e8-a2ec-6cc21735f730.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?fb17fe67"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N");
  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_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:xerces-c3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:xmltooling");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/02/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/02/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/02/28");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"FreeBSD Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/FreeBSD/release", "Host/FreeBSD/pkg_info");

  exit(0);
}


include("audit.inc");
include("freebsd_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/FreeBSD/release")) audit(AUDIT_OS_NOT, "FreeBSD");
if (!get_kb_item("Host/FreeBSD/pkg_info")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (pkg_test(save_report:TRUE, pkg:"xmltooling<1.6.4")) flag++;
if (pkg_test(save_report:TRUE, pkg:"xerces-c3<3.1.4")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:pkg_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");