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FreeBSD : asterisk -- Buffer Overrun in PJSIP transaction layer (0537afa3-3ce0-11e7-bf9d-001999f8d30b)

2017-05-22T00:00:00
ID FREEBSD_PKG_0537AFA33CE011E7BF9D001999F8D30B.NASL
Type nessus
Reporter Tenable
Modified 2017-05-22T00:00:00

Description

The Asterisk project reports :

A remote crash can be triggered by sending a SIP packet to Asterisk with a specially crafted CSeq header and a Via header with no branch parameter. The issue is that the PJSIP RFC 2543 transaction key generation algorithm does not allocate a large enough buffer. By overrunning the buffer, the memory allocation table becomes corrupted, leading to an eventual crash.

The multi-part body parser in PJSIP contains a logical error that can make certain multi-part body parts attempt to read memory from outside the allowed boundaries. A specially crafted packet can trigger these invalid reads and potentially induce a crash.

This issues is in PJSIP, and so the issue can be fixed without performing an upgrade of Asterisk at all. However, we are releasing a new version of Asterisk with the bundled PJProject updated to include the fix.

If you are running Asterisk with chan_sip, this issue does not affect you.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from the FreeBSD VuXML database :
#
# Copyright 2003-2017 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(100313);
  script_version("$Revision: 3.1 $");
  script_cvs_date("$Date: 2017/05/22 13:36:33 $");

  script_name(english:"FreeBSD : asterisk -- Buffer Overrun in PJSIP transaction layer (0537afa3-3ce0-11e7-bf9d-001999f8d30b)");
  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:
"The Asterisk project reports :

A remote crash can be triggered by sending a SIP packet to Asterisk
with a specially crafted CSeq header and a Via header with no branch
parameter. The issue is that the PJSIP RFC 2543 transaction key
generation algorithm does not allocate a large enough buffer. By
overrunning the buffer, the memory allocation table becomes corrupted,
leading to an eventual crash.

The multi-part body parser in PJSIP contains a logical error that can
make certain multi-part body parts attempt to read memory from outside
the allowed boundaries. A specially crafted packet can trigger these
invalid reads and potentially induce a crash.

This issues is in PJSIP, and so the issue can be fixed without
performing an upgrade of Asterisk at all. However, we are releasing a
new version of Asterisk with the bundled PJProject updated to include
the fix.

If you are running Asterisk with chan_sip, this issue does not affect
you."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"http://downloads.asterisk.org/pub/security/AST-2017-002.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"http://downloads.asterisk.org/pub/security/AST-2017-003.html"
  );
  # http://www.freebsd.org/ports/portaudit/0537afa3-3ce0-11e7-bf9d-001999f8d30b.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?8b8f3df2"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_attribute(attribute:"risk_factor", value:"High");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:asterisk13");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:pjsip");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:pjsip-extsrtp");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/04/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/05/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/05/22");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017 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:"asterisk13<13.15.1")) flag++;
if (pkg_test(save_report:TRUE, pkg:"pjsip<2.6_1")) flag++;
if (pkg_test(save_report:TRUE, pkg:"pjsip-extsrtp<2.6_1")) flag++;

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