FreeBSD : fetchmail -- improper SSL certificate subject verification (5179d85c-8683-11de-91b9-0022157515b2)

2009-08-12T00:00:00
ID FREEBSD_PKG_5179D85C868311DE91B90022157515B2.NASL
Type nessus
Reporter Tenable
Modified 2013-06-21T00:00:00

Description

Matthias Andree reports :

Moxie Marlinspike demonstrated in July 2009 that some CAs would sign certificates that contain embedded NUL characters in the Common Name or subjectAltName fields of ITU-T X.509 certificates.

Applications that would treat such X.509 strings as NUL-terminated C strings (rather than strings that contain an explicit length field) would only check the part up to and excluding the NUL character, so that certificate names such as www.good.example\0www.bad.example.com would be mistaken as a certificate name for www.good.example. fetchmail also had this design and implementation flaw.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from the FreeBSD VuXML database :
#
# Copyright 2003-2013 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(40571);
  script_version("$Revision: 1.9 $");
  script_cvs_date("$Date: 2013/06/21 23:52:43 $");

  script_cve_id("CVE-2009-2666");

  script_name(english:"FreeBSD : fetchmail -- improper SSL certificate subject verification (5179d85c-8683-11de-91b9-0022157515b2)");
  script_summary(english:"Checks for updated package in pkg_info output");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote FreeBSD host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Matthias Andree reports :

Moxie Marlinspike demonstrated in July 2009 that some CAs would sign
certificates that contain embedded NUL characters in the Common Name
or subjectAltName fields of ITU-T X.509 certificates.

Applications that would treat such X.509 strings as NUL-terminated C
strings (rather than strings that contain an explicit length field)
would only check the part up to and excluding the NUL character, so
that certificate names such as www.good.example\0www.bad.example.com
would be mistaken as a certificate name for www.good.example.
fetchmail also had this design and implementation flaw."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.fetchmail.info/fetchmail-SA-2009-01.txt"
  );
  # http://www.freebsd.org/ports/portaudit/5179d85c-8683-11de-91b9-0022157515b2.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?844b4ed6"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N");
  script_cwe_id(310);

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:fetchmail");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2009/08/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2009/08/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2009/08/12");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2009-2013 Tenable Network Security, Inc.");
  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:"fetchmail<6.3.11")) 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");