(Posting this again as it seem not to have reached the list)

I encountered some behavior that was not as I expected with some zip
files and clamscan (I'm not saying it is a bug - it may be by design).

One of our clients attempted to send us a zipfile or data which had been
compressed down to around 1.5% of its original size.  Not surprisingly
this triggered the oversize zip rule which in turn caused it to be
rejected by MailScanner.  Or response to this was to advise the client
to password protect it (so that clam could not unzip it) - but this
still triggered the oversize warning.

Thinking more on this I'm guessing that clam does the equivalent of
running zipinfo to work out the compression ratio and/or unzipped size
before attempting to unpack (?).  Since clam will be unable to unpack
encrypted files within an archive should it really apply the oversize
tests to them?  I know that zipinfo is able to determine that a file is
encrypted, so I presume this information should be available to clam.






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