Microsoft Internet Explorer 5/6/7 - Memory Corruption (MS09-054)

2009-10-1500:00:00

Skylined

www.exploit-db.com

9.3 High

CVSS2

Attack Vector

NETWORK

Attack 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

6.4 Medium

AI Score

Confidence

Low

0.956 High

EPSS

Percentile

99.4%

JSON

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.