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Insecure Library Loading
Extremely critical

Internet Explorer Multiple Vulnerabilities

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Release Date:  2010-12-14    Last Update:  2011-03-01    Views:  24,335

Secunia Advisory SA42510

Where:

From remote

Impact:

System access

Solution Status:

Vendor Patch

CVE Reference(s):

Description


Multiple vulnerabilities have been reported in Internet Explorer, which can be exploited by malicious people to compromise a user's system.

1) A use-after-free error when processing Cascading Style Sheets (CSS) can be exploited to dereference freed memory via e.g. a specially crafted CSS file containing multiple import rules.

NOTE: According to Microsoft, the vulnerability is being actively exploited.

2) A use-after-free error when a certain data binding event removes a DSO (data source object) from the markup can be exploited to dereference already freed memory via a specially crafted web page.

3) An unspecified error exists in the way a certain object, which has not been correctly initialised or has been deleted, is accessed. This can be exploited to corrupt memory via a specially crafted web page.

4) Certain libraries (e.g. IEShims.dll) are loaded in an unsafe manner, which can be exploited to load arbitrary libraries by tricking a user into e.g. opening a HTML file located on a remote WebDAV or SMB share.

Successful exploitation of the vulnerabilities allows execution of arbitrary code.


Solution:
Apply patches.

Further details available to Secunia VIM customers

Provided and/or discovered by:
1) sec yun
2) The vendor credits Yuki Chen, Trend Micro.
3) The vendor credits SkyLined, Google.
4) MantyCore

Original Advisory:
MS11-003 (KB2482017):
http://www.microsoft.com/technet/security/Bulletin/MS11-003.mspx

WooYun:
http://www.wooyun.org/bugs/wooyun-2010-0885

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Internet Explorer Multiple Vulnerabilities

User Message
[+]

koppensb

RE: Internet Explorer CSS Import Rule Processing Memory Corruption Vulnerability
This reply has been minimised due to a negative Relevancy Score.
koppensb RE: Internet Explorer CSS Import Rule Processing Memory Corruption Vulnerability
Member 14th Dec, 2010 15:13
Score: 9
Posts: 4
User Since: 29th Sep 2010
System Score: N/A
Location: AT
Last edited on 14th Dec, 2010 15:13
Does confirmed with Internet Explorer 8 mean that it is also exploitable with Protected Mode activated?
Was this reply relevant?
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-2

htmtrade

RE: Internet Explorer CSS Import Rule Processing Memory Corruption Vulnerability
[+]
This reply has been deleted
ddmarshall RE: Internet Explorer CSS Import Rule Processing Use-After-Free Vulnerability
Dedicated Contributor 23rd Dec, 2010 16:14
Score: 1172
Posts: 940
User Since: 8th Nov 2008
System Score: 100%
Location: UK
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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This answer is provided “as-is.” You bear the risk of using it.
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crimsoncarnage

RE: Internet Explorer CSS Import Rule Processing Use-After-Free Vulnerability
[+]
This reply has been deleted

crimsoncarnage

RE: Internet Explorer CSS Import Rule Processing Use-After-Free Vulnerability
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This reply has been minimised due to a negative Relevancy Score.

ddmarshall

RE: Internet Explorer CSS Import Rule Processing Memory Corruption Vulnerability
[+]
This reply has been minimised due to a negative Relevancy Score.

mbphvice

RE: Internet Explorer CSS Import Rule Processing Use-After-Free Vulnerability
[+]
This reply has been minimised due to a negative Relevancy Score.
ddmarshall RE: Internet Explorer CSS Import Rule Processing Memory Corruption Vulnerability
Dedicated Contributor 20th Jan, 2011 14:05
Score: 1172
Posts: 940
User Since: 8th Nov 2008
System Score: 100%
Location: UK
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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