weird ClamAv error

Derek Winkler dwinkler at ALGORITHMICS.COM
Fri Dec 5 21:38:14 GMT 2003

I increased it to 50 and still got this error, maybe I'll try 70.

-----Original Message-----
From: MailScanner mailing list [mailto:MAILSCANNER at JISCMAIL.AC.UK]On
Behalf Of Kevin Spicer
Sent: Friday, December 05, 2003 4:28 PM
Subject: Re: weird ClamAv error

On Fri, 2003-12-05 at 21:17, Michele Neylon :: Blacknight Solutions
> It was a valid zip file of a text document. The total size of the file was
> less than 1kb, so our sysadmin is rather confused - especially as the file
> was clean

There are thresholds for both total size of zip and compression ratio.
The default max compression ratio is currently 20:1  This is rather low
actually.  If you built clam from source you can tweak this...

Direct quote from the clam list...

Please edit libclamav/scanners.c, the line 64:

#define ZIPOSDET 20 /* FIXME: Make it user definable */

and increase the value to 50.

[others have since suggested this should be 70 or higher]
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