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Home : Advisories : McAfee WebShield SMTP v4.5 vulnerabilities

Title: McAfee WebShield SMTP v4.5 vulnerabilities
Released by: Jari Helenius
Date: 23rd November 2000
Printable version: Click here
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%

20catalogue&body=Please%20include%20your%20name%20

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 ,  or ) (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 

stopped.



Yours

Jari Helenius








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