Public Vulnerability Reports

Blue Coat Systems WinProxy CONNECT Method Heap Overflow Vulnerability



BlueCoat WinProxy is an Internet sharing proxy server designed for small to medium businesses. In addition to internet sharing Winproxy also hosts a series of security, anti-spam and anti-spyware capabilities. More information can be located at the link shown below.


Remote exploitation of a design error in Blue Coat Systems Inc.'s WinProxy allows attackers to trigger a heap corruption vulnerability.

The vulnerability can be triggered by sending an overly long HTTP CONNECT request to WinProxy's HTTP proxy service.


Exploitation allows an attacker to cause a denial of service condition or potentially execute arbitrary code.

Overly long payloads will result in a non-exploitable DoS condition.


iDefense has confirmed this vulnerability in WinProxy 6.1a and 6.0 r1c. All previous versions are suspected vulnerable.


Disabling the WinProxy HTTP protocol will prevent this attack.


Blue Coat Systems has addressed this vulnerability within version 6.1r1c of WinProxy.


A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.


08/16/2006 Initial vendor notification
09/19/2006 Initial vendor response
12/06/2006 Second vendor notification
02/02/2007 Coordinated public disclosure


This vulnerability was reported to iDefense by Manuel Santamarina Suarez aka 'FistFuXXer'.

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Copyright © 2006 Verisign, Inc.

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