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Re: Vulnerabilities reported in ClamAV 0.96.4
From: Matt Watchinski <mwatchinski () sourcefire com>
Date: Wed, 21 Mar 2012 13:41:44 -0400

Yup goes somewhere useful.

We don't have anymore information than you, but they are loaded in our
bugtracker for investigation.  From our understanding the researcher did
test 0.96.4, and not 0.97.4.

Cheers,
-matt

On Wed, Mar 21, 2012 at 12:51 PM, Vincent Danen <vdanen () redhat com> wrote:

Hopefully security@ for ClamAV goes somewhere useful (I don't feel like
opening a bugzilla account there just to ask this).

Saw a bunch of CVEs come through for various anti-virus products, five
of which are reportedly applicable for ClamAV 0.96.4.  I'm wondering a)
if the upstream folks know about these and b) whether or not the report
has a typo in the version, since 0.97.4 is the latest upstream version?

http://www.securityfocus.com/**archive/1/522005<http://www.securityfocus.com/archive/1/522005>

Indicates that CVE-2012-1419, CVE-2012-1443, CVE-2012-1457,
CVE-2012-1458, and CVE-2012-1459 affect ClamAV 0.96.4.  There isn't much
more information though.  Cutting-n-pasting from the report:

1. Specially crafted infected POSIX TAR files with "[aliases]" as first
9 bytes evades detection. (CVE-2012-1419)

[...]

25. Infected RAR files with initial two bytes set to 'MZ' can be fixed
by the user and correctly extracted. Such a file evades detection.
(CVE-2012-1443)

[...]

39. If the length field in the header of a file with test EICAR virus
included into a TAR archive is set to be greater than the archive's
total length (1,000,000+original length in our experiments), the
antivirus declares the file to be clean but virus gets extracted
correctly by the GNU tar program. (CVE-2012-1457)

40. A Windows Compiled HTML Help (CHM) file is a set of HTML files,
scripts, and images compressed using the LZX algorithm.  For faster
random accesses, the algorithm is reset at intervals instead of
compressing the entire file as a single stream. The length of each
interval is specified in the LZXC header.

If an infected CHM file's header modified so that the reset interval is
lower than in the original file, the antivirus declares the file to be
clean. But the Windows CHM viewer hh.exe correctly decompresses the
infected content located before the tampered header. (CVE-2012-1458)

41. In a POSIX TAR archive, each member file has a 512-byte header
protected by a simple checksum. Every header also contains a file length
field, which is used by the extractor to locate the next header in the
archive.

If a TAR archive contains two files: the first one is clean, while the
second is infected with test EICAR virus - and it is modified such that
the length field in the header of the first, clean file to point into
the middle of the header of the second, infected file. The antivirus
declares the file to be clean but virus gets extracted correctly by the
GNU tar program. (CVE-2012-1459)

--
Vincent Danen / Red Hat Security Response Team




-- 
Matthew Watchinski
V.P. Vulnerability Research (VRT)
Sourcefire, Inc.
Office: 410-423-1928
http://vrt-blog.snort.org && http://www.snort.org/vrt/

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