FreeBSD : snort -- Back Orifice preprocessor buffer overflow vulnerability (97d45e95-3ffc-11da-a263-0001020eed82)

2006-05-13T00:00:00
ID FREEBSD_PKG_97D45E953FFC11DAA2630001020EED82.NASL
Type nessus
Reporter This script is Copyright (C) 2006-2021 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2021-01-06T00:00:00

Description

Jennifer Steffens reports :

The Back Orifice preprocessor contains a stack-based buffer overflow. This vulnerability could be leveraged by an attacker to execute code remotely on a Snort sensor where the Back Orifice preprocessor is enabled. However, there are a number of factors that make remote code execution difficult to achieve across different builds of Snort on different platforms, even on the same platform with different compiler versions, and it is more likely that an attacker could use the vulnerability as a denial of service attack.

The Back Orifice preprocessor can be disabled by commenting out the line 'preprocessor bo' in snort.conf. This can be done in any text editor using the following procedure :

  • Locate the line 'preprocessor bo'

  • Comment out this line by preceding it with a hash (#). The new line will look like '#preprocessor bo'

  • Save the file

  • Restart snort

                                        
                                            #%NASL_MIN_LEVEL 70300
#
# (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('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(21481);
  script_version("1.16");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/06");

  script_xref(name:"CERT", value:"175500");

  script_name(english:"FreeBSD : snort -- Back Orifice preprocessor buffer overflow vulnerability (97d45e95-3ffc-11da-a263-0001020eed82)");
  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:
"Jennifer Steffens reports :

The Back Orifice preprocessor contains a stack-based buffer overflow.
This vulnerability could be leveraged by an attacker to execute code
remotely on a Snort sensor where the Back Orifice preprocessor is
enabled. However, there are a number of factors that make remote code
execution difficult to achieve across different builds of Snort on
different platforms, even on the same platform with different compiler
versions, and it is more likely that an attacker could use the
vulnerability as a denial of service attack.

The Back Orifice preprocessor can be disabled by commenting out the
line 'preprocessor bo' in snort.conf. This can be done in any text
editor using the following procedure :

- Locate the line 'preprocessor bo'

- Comment out this line by preceding it with a hash (#). The new line
will look like '#preprocessor bo'

- Save the file

- Restart snort"
  );
  # http://www.snort.org/pub-bin/snortnews.cgi#99
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?4bccebc1"
  );
  # http://xforce.iss.net/xforce/alerts/id/207
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?365e2313"
  );
  # https://vuxml.freebsd.org/freebsd/97d45e95-3ffc-11da-a263-0001020eed82.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?f34c188b"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected package.");
  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:snort");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2005/10/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2005/10/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2006/05/13");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2006-2021 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:"snort>=2.4.0<2.4.3")) 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");