9.3 High
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
Microsoft Internet Explorer 567 - Memory Corruption (MS09-054)
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.