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MSIE Content-Encoding: Deflate Memory Corruption

MSIE Content-Encoding: Deflate Memory Corruption
Posted Oct 15, 2009
Authored by SkyLined

Microsoft Internet Explorer suffers from a Content-Encoding: deflate memory corruption vulnerability.

tags | exploit
advisories | CVE-2009-1547
SHA-256 | 80fa117d24dc8845f2994b4d1e1342b08f6ff97d25b492bb4f924064b92e3e2c

MSIE Content-Encoding: Deflate Memory Corruption

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MSIE Content-Encoding: deflate memory corruption vulnerability

(a.k.a. MSRC 8769, MS09-054, CVE-2009-1547, “Data Stream Header Corruption Vulnerability”)

Microsoft fixed a bug in Internet Explorer’s “Content-Encoding:deflate” implementation. Here are two HTTP replies that trigger the bug:

HTTP/.\nContent-Encoding:deflate\r\t\n\r\n\x20\x20
HTTP \nContent-Encoding:deflate\nContent-Range:\n\n”

The bug allows memory corruption, which can be exploited to execute arbitrary code. The big surprise (to me at least) is that nobody seems to have found this before even though it’s fairly easy to trigger.


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