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Network Security Snort-Signatures
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[Snort-sigs] false negative for SID 2386

Subject: [Snort-sigs] false negative for SID 2386
Date: Fri, 17 Jun 2005 15:54:30 +0200
Hi there,
 
I recently found a few attempts to exploit that ASN.1 bug while going through a 
binary tcpdump-log using ethereal.
 
GET / HTTP/1.0
Host: a.b.c.d
Authorization: Negotiate YIIQegYGKwYBBQUCoIIQb [--cut--]
 
Snort doesn't report this one.
 
maybe the rule should be changed to
 
alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"WEB-IIS NTLM 
ASN.1 vulnerability scan attempt"; flow:to_server,established; 
content:"Authorization|3A| Negotiate YI"; reference:bugtraq,9633; 
reference:bugtraq,9635; reference:cve,2003-0818; reference:nessus,12052; 
reference:nessus,12055; reference:nessus,12065; classtype:attempted-dos; 
sid:2386; rev:8;)
 
as the Authorization only is the same upto here.
 
Kind regards
 
Lutz Schildt
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