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Author Topic: Microsoft released an Emergency Fix for IE  (Read 1519 times)

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Microsoft released an Emergency Fix for IE
« on: 19. September 2013., 18:13:42 »

Stepping outside its normal Patch Tuesday cycle, Microsoft has rolled out an emergency fix to an Internet Explorer bug that was under active malware attack.

This advisory provides access to “Fix it For Me”: , with a more detailed outline of the CVE-2013-3893 vulnerability here: All versions of IE 6 to 10 are affected.

As Microsoft writes, the vulnerability “exists in the way that Internet Explorer accesses an object in memory that has been deleted or has not been properly allocated. The vulnerability may corrupt memory in a way that could allow an attacker to execute arbitrary code in the context of the current user within Internet Explorer. An attacker could host a specially crafted website that is designed to exploit this vulnerability through Internet Explorer and then convince a user to view the website.”

The current temporary fix is designed to prevent exploitation of the bug, with a permanent fix presumably to follow. In this TechNet post: , Microsoft's Dustin Childs writes that IE users should take further action:

- Set Internet and local intranet security zone settings to "High" to block ActiveX Controls and Active Scripting in these zones

- Configure Internet Explorer to prompt before running Active Scripting or to disable Active Scripting in the Internet and local intranet security zones.

Childs notes that both of these actions “may affect usability” and suggests adding trusted sites to the Internet Explorer Trusted zone.

Since the stopgap “Fix It” patch isn't being rolled out automatically, users have to take their courage in their own hands and download it themselves.



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Re: Microsoft released an Emergency Fix for IE
« Reply #1 on: 19. September 2013., 22:35:05 »
Internet Explorer... What's that?  ???

devnullius  :angel:
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Re: Microsoft released an Emergency Fix for IE
« Reply #2 on: 21. September 2013., 09:07:40 »
Internet Explorer... What's that?  ???

devnullius  :angel:



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Product Coverage and Mitigation for CVE-2013-3893

Microsoft Security Advisory (2887505)

On September 17th, 2013, Microsoft published Security Advisory 2887505, which coverers a remote code execution vulnerability in all supported versions of Microsoft Internet Explorer.   The flaw resides in the handling of objects in memory which have been deleted or improperly allocated.  Specifically, a use-after-free flaw in the HTML rendering engine (aka mshtml.dll) can be used to invoke the vulnerable state.

This flaw is currently being exploited in limited and targeted attacks.  Functional exploitation and malware artifacts have been identified in the wild.

Remediation / Mitigation


• Microsoft has released a Fixit Workaround to address this issue.   A full patch is not yet released.


McAfee Labs

The following McAfee products / content provide coverage

McAfee Vulnerability Manager
  • McAfee MVM / FSL Content Release of 9/18/2013

McAfee Antivirus
  • Coverage is provided in the 7204 DATs, released on 9/20/2013
  • Name – Exploit-IE!heur

McAfee Network Intrusion Prevention Systems (NIPS)
  • UDS Emergency Release of 9/17/2013
  • UDS signature attack ID 0x4510ef00
  • Name=”UDS-HTTP: Microsoft Internet Explorer onlosecapture Use After Free Vulnerability

Original article: Friday, September 20, 2013 at 4:16pm by Jim Walter
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