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Technical Cyber Security Alert 2012-262A

Technical Cyber Security Alert 2012-262A
Posted Sep 19, 2012
Authored by US-CERT | Site us-cert.gov

Technical Cyber Security Alert 2012-262A - An unpatched use-after-free vulnerability in Microsoft Internet Explorer versions 7, 8, and 9 is being exploited in the wild. Microsoft has released Security Advisory 2757760 with mitigation techniques.

tags | advisory
SHA-256 | aaddacb76fec3394a2d249d1d05dbfa6e9db436632983d807730431ef804fe14

Technical Cyber Security Alert 2012-262A

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National Cyber Awareness System

US-CERT Alert TA12-262A
Microsoft Security Advisory for Internet Explorer Exploit

Original release date: September 18, 2012
Last revised: --

Systems Affected

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


Overview

An unpatched use-after-free vulnerability in Microsoft Internet
Explorer versions 7, 8, and 9 is being exploited in the wild.
Microsoft has released Security Advisory 2757760 with mitigation
techniques.


Description

Microsoft Internet Explorer versions 7, 8, and 9 are susceptible to
a use-after-free vulnerability. This vulnerability is being
actively exploited in the wild. At this time, there is no patch
available for this vulnerability. End-users can mitigate the
vulnerability by using Microsoft's Enhanced Mitigation Experience
Toolkit.

Additional mitigation advice is available in the MSRC blog post:
"Microsoft Releases Security Advisory 2757760" and 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 Internet Explorer users read Microsoft Security
Advisory 2757760 and apply mitigation techniques such as using the
Microsoft Enhanced Mitigation Experience Toolkit.


References

* Microsoft Security Advisory (2757760)
<http://technet.microsoft.com/en-us/security/advisory/2757760>

* MSRC Blog: Microsoft Releases Security Advisory 2757760
<http://blogs.technet.com/b/msrc/archive/2012/09/17/microsoft-releases-security-advisory-2757760.aspx>

* Download Microsoft EMET 3.0
<http://www.microsoft.com/en-us/download/details.aspx?id=29851>

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


Revision History

September 18, 2012: Initial release

____________________________________________________________________

Feedback can be directed to US-CERT Technical Staff. Please send
email to <cert@cert.org> with "TA12-262A Feedback VU#480095" in
the subject.
____________________________________________________________________

Produced by US-CERT, a government organization.
____________________________________________________________________

This product is provided subject to this Notification:
http://www.us-cert.gov/privacy/notification.html

Privacy & Use policy:
http://www.us-cert.gov/privacy/

This document can also be found at
http://www.us-cert.gov/cas/techalerts/TA12-262A.html

For instructions on subscribing to or unsubscribing from this
mailing list, visit http://www.us-cert.gov/cas/signup.html
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