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Windows SMB Client Transaction Response Handling Technical Details
(MS05-011)
------------------------------------------------------------------------
SUMMARY
eEye Digital Security has discovered a vulnerability in Windows SMB
client's handling of SMB responses. An attacker who can cause an affected
system to connect to the SMB service on a malicious host may exploit this
vulnerability in order to execute code on the victim's machine.
DETAILS
Vulnerable Systems:
* Windows 2000
* Windows XP
* Windows Server 2003
For detailed information regarding vulnerable systems refer to the
advisory linked in the 'Vendor Status' section below.
The driver MRXSMB.SYS is responsible for performing SMB client operations
and processing the responses returned by an SMB server service. A number
of important Windows File Sharing operations, and all
RPC-over-named-pipes, use the SMB commands Trans (25h) and Trans2 (32h). A
malicious SMB server can respond with specially crafted Transaction
response data that will cause an overflow wherever the data is handled,
either in MRXSMB.SYS or in client code to which it provides data. One
example would be if the file name and short file name length fields in a
Trans2 FIND_FIRST2 response packet can be supplied with inappropriately
large values in order to cause an excessive memcpy to occur when the data
is handled. In the case of these examples an attacker could leverage
file:// links, that when clicked by a remote user, would lead to code
execution.
Vendor Status:
Advisory release date: February 8, 2005
Date Reported to vendor: August 2, 2004
Microsoft has released an advisory and patches for this vulnerability. The
patch is available at:
<http://www.microsoft.com/technet/security/bulletin/MS05-011.mspx>
Vulnerability in Server Message Block Could Allow Remote Code Execution
ADDITIONAL INFORMATION
The information has been provided by <mailto:mmaiffret@eeye.com> Marc
Maiffret.
The original article can be found at:
<http://www.eeye.com/html/research/advisories/AD20050208.html>
http://www.eeye.com/html/research/advisories/AD20050208.html
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