Windows 0-day SMB mrxsmb.dll vulnerability

Published: 2011-02-16
Last Updated: 2011-02-18 03:14:59 UTC
by Jason Lam (Version: 2)
9 comment(s)

A new vulnerability has been discovered exploiting SMB component of Windows. The attack involves sending of malformed Browser Election requests leading the heap overflow within the mrxsmb.dll driver. The vulnerability is known to be able to cause DoS and fully control of vulnerable machines. Proof of concept code for DoS had been released. There are reports that this exploit only work on local network segment (this hasn't been verified).

The general practice of block port 137, 138, 139 and 445 should be observed especially with this 0-day.

More information on this exploit

http://www.vupen.com/english/advisories/2011/0394

Update: MS SRD has posted a blog on this vulnerability stating that remote exploit leading to code execution is highly unlikely.

 

 

Keywords: windows exploit
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