National Cyber Awareness System

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National Cyber Awareness System

US-CERT Alert TA12-265A
Microsoft Releases Patch for Internet Explorer Exploit

Original release date: September 21, 2012
Last revised: --

Systems Affected

* Microsoft Internet Explorer 6
* Microsoft Internet Explorer 7
* Microsoft Internet Explorer 8
* Microsoft Internet Explorer 9


Overview

Microsoft has released Security Bulletin MS12-063 to address the
use-after-free vulnerability that has been actively exploited this
past week.


Description

Microsoft Internet Explorer versions 6, 7, 8, and 9 are susceptible
to a use-after-free vulnerability. This vulnerability is being
actively exploited in the wild. Microsoft has released Security
Bulletin MS12-063 to patch this vulnerability and four others.

This vulnerability was previously mentioned in US-CERT Alert
TA12-262A. Additional information is available in US-CERT
Vulnerability Note VU#480095.


Impact

A remote, unauthenticated attacker could execute arbitrary code,
cause a denial of service, or gain unauthorized access to your
files or system.


Solution

US-CERT recommends that Internet Explorer users run Windows Update
as soon as possible to apply the MS12-063 patch.


References

* Microsoft Security Bulletin MS12-063
<http://technet.microsoft.com/en-us/security/Bulletin/MS12-063>

* US-CERT Alert: Microsoft Security Advisory for Internet Explorer
Exploit
<http://www.us-cert.gov/cas/techalerts/TA12-262A.html>

* Microsoft Windows Update
<http://go.microsoft.com/fwlink/?LinkID=40747>

* US-CERT Vulnerability Note VU#480095
<http://www.kb.cert.org/vuls/id/480095>


Revision History

September 21, 2012: Initial release