Microsoft Internet Explorer JavaScript OnLoad Handler Remote Code Execution Vulnerability

Date Discovered: May 28, 2005

About

Microsoft Internet Explorer is vulnerable to a remote execution vulnerability.

This vulnerability presents itself when the browser handles a JavaScript "onLoad" handler in conjunction with an improper inilization of a "Window()" JavaScript function.

If successfully exploited, a remote hacker could remotely execute malicious code into the computer. Failed exploitation simply results in the program crashing.

Platforms and Operating Systems Affected

Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Advanced Server SP1
Microsoft Windows 2000 Advanced Server SP2
Microsoft Windows 2000 Datacenter Server
Microsoft Windows 2000 Datacenter Server SP1
Microsoft Windows 2000 Datacenter Server SP2
Microsoft Windows 2000 Professional
Microsoft Windows 2000 Professional SP1
Microsoft Windows 2000 Professional SP2
Microsoft Windows 2000 Server
Microsoft Windows 2000 Server SP1
Microsoft Windows 2000 Server SP2
Microsoft Windows 2000 Terminal Services
Microsoft Windows 2000 Terminal Services SP1
Microsoft Windows 2000 Terminal Services SP2
Microsoft Windows 95
Microsoft Windows 98
Microsoft Windows 98SE
Microsoft Windows ME
Microsoft Windows NT Enterprise Server 4.0
Microsoft Windows NT Enterprise Server 4.0 SP1
Microsoft Windows NT Enterprise Server 4.0 SP2
Microsoft Windows NT Enterprise Server 4.0 SP3
Microsoft Windows NT Enterprise Server 4.0 SP4
Microsoft Windows NT Enterprise Server 4.0 SP5
Microsoft Windows NT Enterprise Server 4.0 SP6
Microsoft Windows NT Enterprise Server 4.0 SP6a
Microsoft Windows NT Server 4.0
Microsoft Windows NT Server 4.0 SP1
Microsoft Windows NT Server 4.0 SP2
Microsoft Windows NT Server 4.0 SP3
Microsoft Windows NT Server 4.0 SP4
Microsoft Windows NT Server 4.0 SP5
Microsoft Windows NT Server 4.0 SP6
Microsoft Windows NT Server 4.0 SP6a
Microsoft Windows NT Terminal Server 4.0
Microsoft Windows NT Terminal Server 4.0 SP1
Microsoft Windows NT Terminal Server 4.0 SP2
Microsoft Windows NT Terminal Server 4.0 SP3
Microsoft Windows NT Terminal Server 4.0 SP4
Microsoft Windows NT Terminal Server 4.0 SP5
Microsoft Windows NT Terminal Server 4.0 SP6
Microsoft Windows NT Workstation 4.0
Microsoft Windows NT Workstation 4.0 SP1
Microsoft Windows NT Workstation 4.0 SP2
Microsoft Windows NT Workstation 4.0 SP3
Microsoft Windows NT Workstation 4.0 SP4
Microsoft Windows NT Workstation 4.0 SP5
Microsoft Windows NT Workstation 4.0 SP6
Microsoft Windows NT Workstation 4.0 SP6a
Microsoft Windows Server 2003 Datacenter Edition
Microsoft Windows Server 2003 Datacenter Edition 64-bit
Microsoft Windows Server 2003 Enterprise Edition
Microsoft Windows Server 2003 Enterprise Edition 64-bit
Microsoft Windows Server 2003 Standard Edition
Microsoft Windows Server 2003 Web Edition
Microsoft Windows XP Home
Microsoft Windows XP Professional

Components Affected

Microsoft Internet Explorer 5.0.1 SP4
Microsoft Internet Explorer 5.0.1 SP3
Microsoft Internet Explorer 5.0.1 SP2
Microsoft Internet Explorer 5.0.1 SP1
Microsoft Internet Explorer 5.0.1
Microsoft Internet Explorer 5.5 SP2
Microsoft Internet Explorer 5.5 SP1
Microsoft Internet Explorer 5.5
Microsoft Internet Explorer 6.0 SP2
Microsoft Internet Explorer 6.0 SP1
Microsoft Internet Explorer 6.0

Further Reading

• Symantec Description - http://www.sarc.com/avcenter/security/Content/13799.html
• Microsoft Security Bulletin MS05-054 - http://www.microsoft.com/technet/security/Bulletin/MS05-054.mspx

Credits

Benjamin Tobias Franz discovered this vulnerability.