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Forum Thread: Internet Explorer CSS Import Rule Processing Memory Corruption Vu...

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See the original Secunia advisory:
Internet Explorer CSS Import Rule Processing Memory Corruption Vulnerability

Secunia Internet Explorer CSS Import Rule Processing Memory Corruption Vulnerability
Secunia Official 14th Dec, 2010 15:12
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A vulnerability has been discovered in Internet Explorer, which can potentially be exploited by malicious people to compromise a user's system.

The vulnerability is caused due to an error when processing Cascading Style Sheets (CSS) and can be exploited to corrupt memory via e.g. a specially crafted CSS file containing multiple import rules.

Successful exploitation may allow execution of arbitrary code.

The vulnerability is confirmed in Internet Explorer 7 and 8 on a fully patched Windows XP SP3 system.

koppensb

RE: Internet Explorer CSS Import Rule Processing Memory Corruption Vulnerability
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koppensb RE: Internet Explorer CSS Import Rule Processing Memory Corruption Vulnerability
Member 14th Dec, 2010 15:13
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Last edited on 14th Dec, 2010 15:13
Does confirmed with Internet Explorer 8 mean that it is also exploitable with Protected Mode activated?
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htmtrade

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ddmarshall RE: Internet Explorer CSS Import Rule Processing Use-After-Free Vulnerability
Dedicated Contributor 23rd Dec, 2010 16:14
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Last edited on 23rd Dec, 2010 16:14
The Microsoft Security Advisory states that exploitation is possible with Protected Mode on, but the attacker would have very limited rights.
http://www.microsoft.com/technet/security/advisory...

For Vista and later systems, the Enhanced Mitigation Experience Toolkit can be used to prevent the published exploit working by forcing ASLR for Internet Explorer. Some of the other mitigations may be effective for XP.
http://blogs.technet.com/b/srd/archive/2010/12/22/...



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crimsoncarnage

RE: Internet Explorer CSS Import Rule Processing Use-After-Free Vulnerability
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ddmarshall

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ddmarshall RE: Internet Explorer CSS Import Rule Processing Memory Corruption Vulnerability
Dedicated Contributor 20th Jan, 2011 14:05
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If you read the Microsoft advisory, you will find that Internet Explorer 6 is also affected. You cannot use it with Windows 7 and anyone who could use it would be ill advised to use it as it has less inbuilt security than anything later.

There are two easily applied workarounds available to you in the Microsoft advisory. Either install EMET and use it to protect Internet Explorer or run the Fixit in http://support.microsoft.com/kb/2488013 .

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