Microsoft Internet Explorer showHelp() zone bypass

ie-showhelp-zone-bypass (11259) The risk level is classified as MediumMedium Risk


Microsoft Internet Explorer could allow a remote attacker to bypass the cross-domain security model, caused by a vulnerability in the Windows showHelp() method. The showHelp() method is used to display HTML help files in Internet Explorer. Internet Explorer fails to properly verify the origin domain when the showHelp() method is used within a Web page. A remote attacker could exploit this vulnerability by creating a malicious Web page that invokes the showHelp() method, which would allow the attacker to bypass security zone restrictions and gain access to resources on the victim's computer, once the page is viewed. An attacker could use this vulnerability to read any known file on the victim's computer, gain access to the victim's cookies, invoke known executables on the victim's computer, or load malicious executables to the victim's computer.


Gain Access


Apply the appropriate patch for your system, as listed in the latest Microsoft Security Bulletin. See References.

— OR —

Use Microsoft Automatic Update if it is supported by your operating system. The original bulletin issued by Microsoft has been superseded.


Platforms Affected:

  • Microsoft Internet Explorer 5.01
  • Microsoft Internet Explorer 5.5
  • Microsoft Internet Explorer 6.0


Feb 05, 2003

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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