Software Engineering Institute

Microsoft XML Core Services (MSXML) allow developers who use JScript, Visual Basic Scripting Edition (VBScript), and Microsoft Visual Studio 6.0 to create XML-based applications. Extensible Stylesheet Language Transformations (XSLT) is an XML language that can be used to manipulate and transform XML documents. Microsoft includes XSLT as a part of MSXML.

An unspecified buffer overflow exists in the Microsoft implementation of XSLT. This vulnerability may allow an attacker to execute arbitrary code with the privileges of the user who is running Internet Explorer.

Note that an attacker would have to convince a user to visit a specially-crafted webpage to exploit this vulnerability.

A remote, unauthenticated attacker may be able to execute arbitrary code with the privileges of the user who opened Internet Explorer.

Udpate
Microsoft has released an update to address this issue. See Microsoft Security Bulletin MS06-061for more details.

Do not open web browsers with administrator privileges
Do not use an administrator account to browser the Internet. See the Before You Connect a New Computer to the Internet document for information on how to create an account with limited privileges. If logged in with administrator privileges, consider using the runas command to run Internet Explorer with reduced privileges.

Note that this workaround will not prevent exploitation of this vulnerability, but may reduce the immediate impact of successful exploitation.