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  3. Microsoft WinHTTP Integer Underflow Memory Corruption Remote Code Execution Vulnerability

Microsoft WinHTTP Integer Underflow Memory Corruption Remote Code Execution Vulnerability

Risk

High

Date Discovered

April 14, 2009

Description

Microsoft Windows HTTP Services (WinHTTP) is prone to a remote code-execution vulnerability. Attackers can exploit this issue to execute arbitrary code in the context of the user running the application. Successful exploits will compromise an affected application and possibly the computer. Failed attacks will cause denial-of-service conditions.

Technologies Affected

  • Microsoft Windows 2000 Professional
  • Microsoft Windows 2000 Professional SP1
  • Microsoft Windows 2000 Professional SP2
  • Microsoft Windows 2000 Professional SP3
  • Microsoft Windows 2000 Professional SP4
  • Microsoft Windows Server 2003 Datacenter Edition
  • Microsoft Windows Server 2003 Datacenter Edition Itanium
  • Microsoft Windows Server 2003 Datacenter Edition Itanium SP1
  • Microsoft Windows Server 2003 Datacenter Edition SP1
  • Microsoft Windows Server 2003 Datacenter x64 Edition
  • Microsoft Windows Server 2003 Datacenter x64 Edition SP2
  • Microsoft Windows Server 2003 Enterprise Edition
  • Microsoft Windows Server 2003 Enterprise Edition Itanium
  • Microsoft Windows Server 2003 Enterprise Edition Itanium SP1
  • Microsoft Windows Server 2003 Enterprise Edition SP1
  • Microsoft Windows Server 2003 Enterprise x64 Edition
  • Microsoft Windows Server 2003 Enterprise x64 Edition SP2
  • Microsoft Windows Server 2003 Itanium
  • Microsoft Windows Server 2003 Itanium SP1
  • Microsoft Windows Server 2003 Itanium SP2
  • Microsoft Windows Server 2003 SP1
  • Microsoft Windows Server 2003 SP2
  • Microsoft Windows Server 2003 Standard Edition
  • Microsoft Windows Server 2003 Standard Edition SP1
  • Microsoft Windows Server 2003 Standard Edition SP2
  • Microsoft Windows Server 2003 Standard x64 Edition
  • Microsoft Windows Server 2003 Web Edition
  • Microsoft Windows Server 2003 Web Edition SP1
  • Microsoft Windows Server 2003 Web Edition SP2
  • Microsoft Windows Server 2003 x64 SP1
  • Microsoft Windows Server 2003 x64 SP2
  • Microsoft Windows Server 2008 Datacenter Edition
  • Microsoft Windows Server 2008 Enterprise Edition
  • Microsoft Windows Server 2008 Standard Edition
  • Microsoft Windows Server 2008 for 32-bit Systems
  • Microsoft Windows Server 2008 for Itanium-based Systems
  • Microsoft Windows Server 2008 for x64-based Systems
  • Microsoft Windows Vista
  • Microsoft Windows Vista Business
  • Microsoft Windows Vista Business 64-bit edition
  • Microsoft Windows Vista Business 64-bit edition SP1
  • Microsoft Windows Vista Business SP1
  • Microsoft Windows Vista Enterprise
  • Microsoft Windows Vista Enterprise 64-bit edition
  • Microsoft Windows Vista Enterprise 64-bit edition SP1
  • Microsoft Windows Vista Enterprise SP1
  • Microsoft Windows Vista Home Basic
  • Microsoft Windows Vista Home Basic 64-bit edition
  • Microsoft Windows Vista Home Basic 64-bit edition SP1
  • Microsoft Windows Vista Home Basic SP1
  • Microsoft Windows Vista Home Premium
  • Microsoft Windows Vista Home Premium 64-bit edition
  • Microsoft Windows Vista Home Premium 64-bit edition SP1
  • Microsoft Windows Vista Home Premium SP1
  • Microsoft Windows Vista Ultimate
  • Microsoft Windows Vista Ultimate 64-bit edition
  • Microsoft Windows Vista Ultimate 64-bit edition SP1
  • Microsoft Windows Vista Ultimate SP1
  • Microsoft Windows Vista x64 Edition
  • Microsoft Windows Vista x64 Edition SP1
  • Microsoft Windows XP
  • Microsoft Windows XP Embedded
  • Microsoft Windows XP Embedded SP1
  • Microsoft Windows XP Embedded SP2
  • Microsoft Windows XP Embedded SP3
  • Microsoft Windows XP Home
  • Microsoft Windows XP Home SP1
  • Microsoft Windows XP Home SP2
  • Microsoft Windows XP Home SP3
  • Microsoft Windows XP Media Center Edition
  • Microsoft Windows XP Media Center Edition SP1
  • Microsoft Windows XP Media Center Edition SP2
  • Microsoft Windows XP Media Center Edition SP3
  • Microsoft Windows XP Professional
  • Microsoft Windows XP Professional SP1
  • Microsoft Windows XP Professional SP2
  • Microsoft Windows XP Professional SP3
  • Microsoft Windows XP Professional x64 Edition
  • Microsoft Windows XP Professional x64 Edition SP2
  • Microsoft Windows XP Tablet PC Edition
  • Microsoft Windows XP Tablet PC Edition SP1
  • Microsoft Windows XP Tablet PC Edition SP2
  • Microsoft Windows XP Tablet PC Edition SP3

Recommendations

Run all software as a nonprivileged user with minimal access rights.

To reduce the impact of latent vulnerabilities, always run nonadministrative software as an unprivileged user with minimal access rights.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.

Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This includes but is not limited to requests that include NOP sleds and unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits.

Do not follow links provided by unknown or untrusted sources.

Web users should be cautious about following links to sites that are provided by unfamiliar or suspicious sources. Filtering HTML from emails may help remove a possible vector for transmitting malicious links to users.

Set web browser security to disable the execution of script code or active content.

Since a successful exploit of this issue requires malicious code to execute in web clients, consider disabling support for script code and active content within the client browser. Note that this mitigation tactic might adversely affect legitimate websites that rely on the execution of browser-based script code.

Implement multiple redundant layers of security.

Memory-protection schemes (such as nonexecutable stack and heap configurations and randomly mapped memory segments) will complicate exploits of memory-corruption vulnerabilities.
The vendor has released an advisory and updates. Please see the references for details.

Credits

Greg MacManus of iSIGHT Partners
Copyright © Symantec Corporation.
Permission to redistribute this alert electronically is granted as long as it is not edited in any way unless authorized by Symantec Security Response. Reprinting the whole or part of this alert in any medium other than electronically requires permission from secure@symantec.com.

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.
Symantec, Symantec products, Symantec Security Response, and secure@symantec.com are registered trademarks of Symantec Corp. and/or affiliated companies in the United States and other countries. All other registered and unregistered trademarks represented in this document are the sole property of their respective companies/owners.

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