Good day.
Wed, Feb 13, 2008 at 06:38:46PM +0300, Eygene Ryabinkin
wrote:
> Attached is the draft of the VuXML entry for the new
ClamAV
> vulnerability.
As pointed to me by Remko Lodder, the attachment was
stripped.
Resending it inline.
Remko, thanks again for pointing me to this pity fact!
-----
<vuln vid="unknown">
<topic>clamav -- ClamAV libclamav PE File Integer
Overflow Vulnerability</topic>
<affects>
<package>
<name>clamav</name>
<range><ge>0.92</ge><lt>0.92.1</
lt></range>
</package>
</affects>
<description>
<body xmlns="http://www.w3.
org/1999/xhtml">
<p>iDefense Security Advisory 02.12.08:</p>
<blockquote cite="http://labs.idefense.com/intel
ligence/vulnerabilities/display.php?id=658">
<p>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.</p>
<p>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.</p>
<p>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.</p>
<p>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.</p>
</blockquote>
<h1>Workaround</h1>
<p>Disabling the scanning of PE files will prevent
exploitation.</p>
<p>If using clamscan, this can be done by running
clamscan with the
'--no-pe' option.</p>
<p>If using clamdscan, set the 'ScanPE' option in the
clamd.conf
file to 'no'.</p>
<h1>Vendor response</h1>
<p>The ClamAV team has addressed this vulnerability
within
version 0.92.1. Additionally, the ClamAV team reports,
"the vulnerable module was remotely disabled via
virus-db
update on Jan 11th 2008."</p>
</body>
</description>
<references>
<cvename>CVE-2008-0318</cvename>
<url>http://labs.idefense.com/int
elligence/vulnerabilities/display.php?id=658</url>
<url>http://svn.clamav.net/svn/clamav-devel/trunk/C
hangeLog</url>
</references>
<dates>
<discovery>2008-01-07</discovery>
</dates>
</vuln>
-----
--
Eygene
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