FreeBSD : stunnel -- Remote Code Execution (c97219b6-843d-11e2-b131-000c299b62e1)

2013-03-05T00:00:00
ID FREEBSD_PKG_C97219B6843D11E2B131000C299B62E1.NASL
Type nessus
Reporter Tenable
Modified 2018-11-10T00:00:00

Description

Michal Trojnara reports :

64-bit versions of stunnel with the following conditions : * NTLM authentication enabled * CONNECT protocol negotiation enabled * Configured in SSL client mode * An attacker that can either control the proxy server specified in the 'connect' option or execute MITM attacks on the TCP session between stunnel and the proxy

Can be exploited for remote code execution. The code is executed within the configured chroot directory, with privileges of the configured user and group.

                                        
                                            #
# (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(65003);
  script_version("1.13");
  script_cvs_date("Date: 2018/11/10 11:49:43");

  script_cve_id("CVE-2013-1762");

  script_name(english:"FreeBSD : stunnel -- Remote Code Execution (c97219b6-843d-11e2-b131-000c299b62e1)");
  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:
"Michal Trojnara reports :

64-bit versions of stunnel with the following conditions : * NTLM
authentication enabled * CONNECT protocol negotiation enabled *
Configured in SSL client mode * An attacker that can either control
the proxy server specified in the 'connect' option or execute MITM
attacks on the TCP session between stunnel and the proxy

Can be exploited for remote code execution. The code is executed
within the configured chroot directory, with privileges of the
configured user and group."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.stunnel.org/CVE-2013-1762.html"
  );
  # https://vuxml.freebsd.org/freebsd/c97219b6-843d-11e2-b131-000c299b62e1.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?0ec01b25"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:C");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2013/03/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2013/03/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2013/03/05");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2013-2018 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:"stunnel>=4.21<4.55")) 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");