FreeBSD : clamav -- ClamAV libclamav PE File Integer Overflow Vulnerability (be4b0529-dbaf-11dc-9791-000ea6702141)

2008-02-18T00:00:00
ID FREEBSD_PKG_BE4B0529DBAF11DC9791000EA6702141.NASL
Type nessus
Reporter Tenable
Modified 2018-11-10T00:00:00

Description

iDefense Security Advisory 02.12.08 :

Remote exploitation of an integer overflow vulnerability in Clam AntiVirus' ClamAV, as included in various vendors' operating system distributions, allows attackers to execute arbitrary code with the privileges of the affected process.

The vulnerability exists within the code responsible for parsing and scanning PE files. While iterating through all sections contained in the PE file, several attacker controlled values are extracted from the file. On each iteration, arithmetic operations are performed without taking into consideration 32-bit integer wrap.

Since insufficient integer overflow checks are present, an attacker can cause a heap overflow by causing a specially crafted Petite packed PE binary to be scanned. This results in an exploitable memory corruption condition.

Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the process using libclamav. In the case of the clamd program, this will result in code execution with the privileges of the clamav user. Unsuccessful exploitation results in the clamd process crashing. Workaround Disabling the scanning of PE files will prevent exploitation.

If using clamscan, this can be done by running clamscan with the '--no-pe' option.

If using clamdscan, set the 'ScanPE' option in the clamd.conf file to 'no'.

                                        
                                            #
# (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(31109);
  script_version("1.15");
  script_cvs_date("Date: 2018/11/10 11:49:41");

  script_cve_id("CVE-2008-0318");

  script_name(english:"FreeBSD : clamav -- ClamAV libclamav PE File Integer Overflow Vulnerability (be4b0529-dbaf-11dc-9791-000ea6702141)");
  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:
"iDefense Security Advisory 02.12.08 :

Remote exploitation of an integer overflow vulnerability in Clam
AntiVirus' ClamAV, as included in various vendors' operating system
distributions, allows attackers to execute arbitrary code with the
privileges of the affected process.

The vulnerability exists within the code responsible for parsing and
scanning PE files. While iterating through all sections contained in
the PE file, several attacker controlled values are extracted from the
file. On each iteration, arithmetic operations are performed without
taking into consideration 32-bit integer wrap.

Since insufficient integer overflow checks are present, an attacker
can cause a heap overflow by causing a specially crafted Petite packed
PE binary to be scanned. This results in an exploitable memory
corruption condition.

Exploitation of this vulnerability results in the execution of
arbitrary code with the privileges of the process using libclamav. In
the case of the clamd program, this will result in code execution with
the privileges of the clamav user. Unsuccessful exploitation results
in the clamd process crashing. Workaround Disabling the scanning of PE
files will prevent exploitation.

If using clamscan, this can be done by running clamscan with the
'--no-pe' option.

If using clamdscan, set the 'ScanPE' option in the clamd.conf file to
'no'."
  );
  # http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=658
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?ccc9155a"
  );
  # http://svn.clamav.net/svn/clamav-devel/trunk/ChangeLog
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?91209430"
  );
  # https://vuxml.freebsd.org/freebsd/be4b0529-dbaf-11dc-9791-000ea6702141.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?4d384df0"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_cwe_id(189);

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2008/01/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2008/02/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2008/02/18");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2008-2018 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:"clamav>=0.92<0.92.1")) 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");