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Network Security Snort-Signatures
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Re: [Snort-sigs] help with 2 rules

Subject: Re: [Snort-sigs] help with 2 rules
Date: Wed, 02 Mar 2005 16:31:57 -0500
At 04:07 PM 3/2/2005, Rowland, Krisa W ERDC-ITL-MS Contractor wrote:
I have no idea what this exploit is for??

alert tcp any $HTTP_PORTS -> $HOME_NET any (msg: "BLEEDING-EDGE Exploit ATmaCA PoC for CORE-2004-0819 -- bad PNG"; flow: to_client,established; content: "|8950 4e47 0d0a 1a0a 0000 000d 4948 4452|"; byte_test: 4,>,256,17,relative; content: "tRNS"; distance: 4; classtype:misc-attack; sid:2001723; rev:2;)

It's an MSN messenger exploit based on corrupted PNG files:

http://www.coresecurity.com/common/showdoc.php?idx=421&idxseccion=10

You can only tell because the left the core security advisory ID in the message part, but didn't include any references. It's one of the downsides of bleeding-edge.. not all the rules are as readable as they could be.. Still, better a rule that can be improved than no rule at all..






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