Blue Coat Systems WinProxy CONNECT Method Heap Overflow Vulnerability iDefense Security Advisory 02.02.07 http://labs.idefense.com/intelligence/vulnerabilities/ Feb 02, 2007 I. BACKGROUND 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. http://www.winproxy.com/ II. DESCRIPTION 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. III. ANALYSIS 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. IV. DETECTION iDefense has confirmed this vulnerability in WinProxy 6.1a and 6.0 r1c. All previous versions are suspected vulnerable. V. WORKAROUND Disabling the WinProxy HTTP protocol will prevent this attack. VI. VENDOR RESPONSE Blue Coat Systems has addressed this vulnerability within version 6.1r1c of WinProxy. VII. CVE INFORMATION A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet. VIII. DISCLOSURE TIMELINE 08/16/2006 Initial vendor notification 09/19/2006 Initial vendor response 12/06/2006 Second vendor notification 02/02/2007 Coordinated public disclosure IX. CREDIT This vulnerability was reported to iDefense by Manuel Santamarina Suarez aka 'FistFuXXer'. Get paid for vulnerability research http://labs.idefense.com/methodology/vulnerability/vcp.php Free tools, research and upcoming events http://labs.idefense.com/ X. LEGAL NOTICES Copyright © 2006 iDefense, Inc. Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please e-mail customerservice@private for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
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