All,


We wanted to bring to your attention an issue that we have been made aware
of in ClamAV 0.97.5.  As part of this release, we tightened the malformed
compression checks in LZX compressed files.  CAB, CHM and Install Shield
file formats may use this compression.



In previous versions of ClamAV, these files would be passed as "OK" when
the decompression failed.  ClamAV 0.97.5 will respond with a CL_EFORMAT
error instead.  In some environments, this level of checking may be
inappropriate.  We are currently reviewing the situation and evaluating
what, if any, changes are appropriate.



A bug has been created so you can follow our work:

https://bugzilla.clamav.net/show_bug.cgi?id=5252



If you have any questions, please let us know.

Matthew Olney
Sourcefire VRT / ClamAV Team
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