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Network Security Snort-Signatures
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[Snort-sigs] new rule for detect gnu mailman utf8 attachement

from [rmkml] Network Security [Permanent Link]
Subject: [Snort-sigs] new rule for detect gnu mailman utf8 attachement
Date: Wed, 16 Nov 2005 11:44:44 +0100 (CET) 
Hi,

please check and add this new rule :

smtp.rules:alert tcp $EXTERNAL_NET any -> $SMTP_SERVERS 25 (msg:"SMTP Mailman Gnu utf8 attachement access"; flow:to_server,established; content:"Content-Disposition|3A 20|attachement"; nocase; content:"filename|2A 3D|utf|2D|8"; nocase;
content:"Content-Transfer-Encoding|3A 20|base64"; nocase; reference:bid,15408; reference:cve,2005-3573; reference:osvdb,20819; classtype:attempted-admin; )

Scrubber.py in mailman does not properly handle UTF8 character encodings in filenames of e-mail attachments, which allows remote attackers to
cause a denial of service (application crash).

*** CRASH and RULE NOT TESTED ***

Improve/comments are welcome.

Regards
Rmkml


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