Advisory Details

August 11th, 2009

Microsoft Remote Desktop Client Arbitrary Code Execution Vulnerability

ZDI-09-057
ZDI-CAN-301

CVE ID CVE-2009-1133
CVSS SCORE
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Remote Desktop
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 8379. For further product information on the TippingPoint IPS: http://www.tippingpoint.com
VULNERABILITY DETAILS

This vulnerability allows attackers to execute arbitrary code on vulnerable installations of Microsoft's Remote Desktop Client. Authentication is not required to exploit this vulnerability.

The specific flaw exists within mstscax.dll when parsing packets from an RDP server. A design flaw in the client allows a malicious RDP server to write to arbitrary memory inside the connecting processes memory space. By hosting a malicious RDP server, an attacker can execute arbitrary code on any client that attempts to connect to it. Privileges gained depend on which user is running the client.

VENDOR RESPONSE Microsoft has issued an update to correct this vulnerability. More details can be found at:
http://www.microsoft.com/technet/security/bulletin/MS09-044.mspx
DISCLOSURE TIMELINE
  • 2008-04-07 - Vulnerability reported to vendor
  • 2009-08-11 - Coordinated public release of advisory
CREDIT wushi of team509 and the SureRun Security Team
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