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Network Security Snort-Signatures
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[Snort-sigs] False positive in 3070.1 (IMAP fetch overflow attempt)

from [nnposter] Network Security [Permanent Link]
Subject: [Snort-sigs] False positive in 3070.1 (IMAP fetch overflow attempt)
Date: Tue, 18 Jan 2005 16:15:13 -0700 
The current version:

alert tcp $EXTERNAL_NET any -> $HOME_NET 143 
(msg:"IMAP fetch overflow attempt"; flow:established,to_server; 
content:"FETCH"; nocase; isdataat: 100,relative; 
pcre:"/\sFETCH\s[^\n]{100}/smi"; 
reference:bugtraq,11775; classtype:misc-attack; sid:3070; rev:1;)


Could somebody at Sourcefire confirm that the buffer overflow happens as 
early as 100 bytes? All published PoC for BID 11775 have the NOP sled 
260 bytes long. Having legitimate FETCH with message specifiers over 100 
bytes is quite common. 

Cheers,
nnposter


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