Microsoft Windows HTML Help ActiveX buffer overflow
| win-html-help-bo (10253) |  High Risk |
Description:
Microsoft Windows is vulnerable to a buffer overflow in one of the HTML Help ActiveX control functions. By passing a malformed parameter to the affected HTML Help ActiveX control function, a remote attacker could overflow a buffer and execute commands on the system with the same privileges as the victim. An attacker could exploit this vulnerability by creating a malicious Web page that calls the affected HTML Help facility function using the ActiveX control, and hosting it on a Web site or sending it to a victim as an HTML email.
Consequences:
Gain Access
Remedy:
Apply the appropriate patch for your system, as listed in Microsoft Security Bulletin MS02-055. See References.
References:
- CIAC Information Bulletin N-002: Microsoft HTML Help ActiveX Control Vulnerabilities.
- Microsoft Security Bulletin MS02-055: Unchecked Buffer in Windows Help Facility Could Enable Code Execution (Q323255).
- NGSSoftware Insight Security Research Advisory #NISR02102002: Windows Help System Buffer Overflow.
- Thor Larholm security advisory TL#004: Windows Help buffer overflow.
- BID-5874: Microsoft Windows Help Facility ActiveX Control Buffer Overflow Vulnerability
- CVE-2002-0693: Buffer overflow in the HTML Help ActiveX Control (hhctrl.ocx) in Microsoft Windows 98, 98 Second Edition, Millennium Edition, NT 4.0, NT 4.0 Terminal Server Edition, Windows 2000, and Windows XP allows remote attackers to execute code via (1) a long parameter to the Alink function, or (2) script containing a long argument to the showHelp function.
- OSVDB ID: 2992: Microsoft IE HTML Help ActiveX Control alink and showHelp Overflow
Platforms Affected:
- Microsoft Windows 2000
- Microsoft Windows 98
- Microsoft Windows 98SE
- Microsoft Windows Me
- Microsoft Windows NT 4.0
- Microsoft Windows NT 4.0 Terminal Server
- Microsoft Windows XP
Reported:
Oct 02, 2002
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