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Category:   Application (Generic)  >   Blue Coat WinProxy Vendors:   Blue Coat Systems
Blue Coat WinProxy Heap Overflow in Processing HTTP CONNECT Requests May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1017586
SecurityTracker URL:
CVE Reference:   CVE-2007-0796   (Links to External Site)
Updated:  May 19 2008
Original Entry Date:  Feb 5 2007
Impact:   Denial of service via network, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 6.1r1c
Description:   A vulnerability was reported in Blue Coat WinProxy. A remote user may be able to execute arbitrary code on the target system.

A remote user can send a specially crafted HTTP CONNECT request to trigger a heap overflow and cause the service to crash or potentially execute arbitrary code. The code will run with the privileges of the target service.

The vendor was notified on August 16, 2006.

Manuel Santamarina Suarez aka 'FistFuXXer' reported this vulnerability to iDefense.

Impact:   A remote user may be able to execute arbitrary code on the target system.
Solution:   The vendor has issued a fixed version (6.1r1c).
Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  iDefense Security Advisory 02.02.07: Blue Coat Systems WinProxy

Blue Coat Systems WinProxy CONNECT Method Heap Overflow Vulnerability

iDefense Security Advisory 02.02.07
Feb 02, 2007


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


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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