MSFN Forum: Unpatched DLL bugs let hackers exploit Windows 7 and IE9, says researcher

Although Microsoft has patched multiple DLL load hijacking vulnerabilities since last summer, Windows and Internet Explorer 9 (IE9) can still be exploited, a security company warned today. Microsoft confirmed that it's investigating the claims by Slovenia-based Acros Security. Researchers from Acros will demonstrate the new attacks at the Hack in the Box security conference in Amsterdam later this month.

"We'll reveal how IE8 and IE9 can be used on Windows 7, Vista and XP for attacking users without any security warnings, even in 'Protected mode,' and how to remotely make many seemingly-safe applications, for example, Word 2010 and PowerPoint 2010, vulnerable," said Acros CEO Mitja Kolsek in a Friday email.

The attack class called "DLL load hijacking" by some, but dubbed "binary planting" by Acros, jumped into public view last August when HD Moore, the creator of the Metasploit penetration hacking toolkit and chief security officer at Rapid7, found dozens of vulnerable Windows applications. Moore's report was followed by others, including several from Kolsek and Acros.

Many Windows applications don't call DLLs using a full path name, but instead use only the filename, giving hackers a way to trick an application into loading a malicious file with the same title as a required DLL. If attackers can dupe users into visiting malicious Web sites or remote shared folders, or get them to plug in a USB drive -- and in some cases con them into opening a file -- they can hijack a PC and plant malware on it.

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