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Shortly after releasing the public bugtraq post, I was contacted by
MetaInfo regarding the problem and was told that they had just put a patch
online, available, with instructions, at www.metainfo.com/download.
While this patch corrected the problem of transversal into higher levels
of the filesystem, it was still open to another kind of DoS attack. If an
attacker was to send a GET request to MetaWeb server that contained around
8K of characters, the MetaWeb server process would spike to 100% CPU
utilization, and stay there indefinately.
Example:
http://mail.server.com:5000/index.htm? 8K of characters here>
This would put the server in an unstable state; now, a regular request
will cause to to spike and hang:
http://mail.server.com:5000/
MetaInfo was contacted about this problem as well; they released a patch
to fix this problem. You can download a copy from www.forristech.com, or
check to see if it's available on MetaInfo's site yet.
-Jeff Forristal
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: Fri Apr 13 2001 - 14:01:55 PDT