GAYER THAN AIDS ADVISORY #01: IE 5 remote code execution

[Feher Tamas <etomcat () freemail hu>]

Hello,

> Now all we have to do is create a BMP with bfOffBits > 2^31,
> and we're in. cbSkip goes negative and the Read call clobbers
> the stack with our data. See attached for proof of concept.
>
> index.html has [img src=1.bmp] where 1.bmp contains 
> bfOffBits=0xEEEEEEEE plus 4k of 0x44332211.
> Brings down IE5 / OE5 (tested successfully on Win98)

Kaspersky Lab's AVP (and possibly other vendors') antivirus suites now 
detect the presence of this method in files by the name "Suspicion: 
Exploit.IMG-BMP".

So any future worm or virus that tries to use this attack vector to inject 
itself automatically should be stopped from the very first minute. Even if 
it is a brand new malware.

Sincerely: Tamas Feher.


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