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McAfee WebShield SMTP vulnerabilities
From: jari.helenius () MAWARON COM
Date: Thu, 23 Nov 2000 11:38:51 -0000

McAfee WebShield SMTP v4.5 have at least two 
vulnerabilities. One with content filter and other 
with smtp recepient field (DoS). Network 
Associates has been informed 7.11.2000 (cont filt) 
and 17.11.2000 (recepient field). Vulnerability 
occures at least NT4sp5 and sp6 installations.

Mailformed SMTP recepient field.
If recepient field is mailformed (ie in recepient 
field is 
"shop () liverpoolfc net?subject=Please%20send%20new%
and%20address") WebShield will crash with access 
violation error. Restarting service results 
immediate crash. This produses DoS and leaves 
posibility of buffer overflow.

Content filter let mail pass against filter rules.
Content filter has been set up to stop messages 
with attachments that have ".exe" in attachment 
name. If attachment name includes special 
characters like € (euro sign) or scandinavian 
characters like ä, å or ö) (name like 
bad€name.exe) content filter won't stop message 
but let's it throug. 

Such attachments are still checked against known 
viruses and mail that contains known virus will be 

Jari Helenius

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