[IVIZ-08-011] ClamAV lzh unpacking segmentation fault

["iViZ Security Advisories" <advisories () ivizsecurity com>]

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[ iViZ Security Advisory 08-011                            10/12/2008 ]
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iViZ Techno Solutions Pvt. Ltd.
                                            http://www.ivizsecurity.com
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* Title:     ClamAV lzh unpacking segmentation fault
* Date:      10/12/2008
* Software:  ClamAV 0.93.3 and prior

--[ Synopsis:

    Clamav uses an external unpacker, which can be deterministically crashed,
    when processing corrupted LZH files.

--[ Affected Software:

  * ClamAV 0.93.3 and prior

--[ Non Affected Software:

  * ClamAV 0.94 and newer

--[ Impact:

    Remote DoS, possibly remote code execution.

--[ Vendor response:

  * "Support for external unpackers has been dropped in 0.94 for
security issues".

--[ Credits:

    This vulnerability was discovered by Security Researcher
    Jonathan Brossard from iViZ Techno Solutions Pvt. Ltd.

--[ Disclosure timeline:

  * First private disclosure to vendor on October 14th 2008
  * First vendor reply on October 15th 2008 : issue fixed.

--[ Reference:

    http://www.ivizsecurity.com/security-advisory.html