Breaking Code

February 10, 2010

Quickpost: New remote authentication vulnerability in Windows

A new security advisory has been published today on a new remote vulnerability (MS10-012, CVE-2010-0231) in the SMB protocol on many Windows versions, ranging from the now ancient Windows NT to the latest Windows 7. This would allow an attacker to authenticate to almost any Windows box, read and write any files, or alternatively upload an executable file and run it. Just let me quote the following, it’s what caught my eye the most:

Given that Windows NT 4 was relased in ~1996 this vulnerability has been
present for ~14 years. If it is confirmed this vulnerablity is also
present in older systems such as Windows NT 3.1, released in ~1993,
Windows NTLMv1 authentication mechanism could have been vulnerable for
~17+ years

Whoa. That’s kind of scary.

Kudos to Hernan Ochoa and Agustin Azubel for this great find! :)

Below is the complete text of the advisory, except for the source code to the scripts, which were removed for brevity. The original advisory can be downloaded from:

Update: Hernan Ochoa has also written an article regarding the risk assesment for this vulnerability.


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