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Microsoft LNK Vulnerability Brief Technical Analysis(CVE-2010-2568)

| Monday, December 24, 2012
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A few days ago, an exploit used for highly targeted attacks was published here: CVE-2010-2568 Lnk shortcut. As the blog post, and other posts, state, this is caused by Windows Control Panel's shortcut image display routine. The original blog post shows a stack trace of the exploit results, which also serves to explain the vulnerability.
The nature of the vulnerability is pretty clear. But out of curiosity we did some reverse engineering and here is what we have found. The bug itself is a design flaw as stated by many people and it's very straightforward to locate the point where it happens. The vulnerable file is shell32.dll and the vulnerable routines are Control Panel-related. We loaded the binary on a disassembler and found that the Control Panel file-related routines start with a “CPL_” prefix.
Drawing 1 shows the relations between CPL initialization routines and data flow. The red “LoadLibraryW” API is the vulnerable one.

Read more: WebSense
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