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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2012-0113
Remote Code Execution Vulnerabilities in Internet Explorer

Original Issue Date:December 12, 2012

Severity Rating: HIGH

Systems Affected

  • Windows Vista Service Pack 2
  • Windows Vista x64 Edition Service Pack 2
  • Windows Server 2008 for 32-bit Systems Service Pack 2
  • Windows Server 2008 for x64-based Systems Service Pack 2
  • Windows 7 for 32-bit Systems
  • Windows 7 for 32-bit Systems Service Pack 1
  • Windows 7 for x64-based Systems
  • Windows 7 for x64-based Systems Service Pack 1
  • Windows Server 2008 R2 for x64-based Systems
  • Windows Server 2008 R2 for x64-based Systems Service Pack 1
  • Windows 8 for 32-bit Systems
  • Windows 8 for 64-bit Systems
  • Windows Server 2012

Component Affected

  • Internet Explorer 9
  • Internet Explorer 10

Overview

Multiple vulnerabilities have been reported in the Microsoft Internet Explorer, which could be exploited by remote attackers to execute arbitrary code to take control of the affected system affected in the context of currently logged-in user

Description

1. InjectHTMLStream Use After Free Vulnerability ( CVE-2012-4781   )

This vulnerability exists in the Microsoft Internet Explorer while handling the  access request for objects that has been deleted. A remote attacker could exploit the vulnerability by hosting specially crafted HTML file on a website and enticing a user to visit the website and open the crafted HTML file . Successful exploitation of the vulnerability results in memory corruption which allows a remote attacker to execute arbitrary code on the target system

Workarounds

  • Set Internet and Local intranet security zone settings to "High" to block ActiveX Controls and Active Scripting in these zones
  • Add sites that you trust to the Internet Explorer Trusted sites zone
  • Configure Internet Explorer to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone


2. CMarkup Use After Free Vulnerability ( CVE-2012-4782   )

This vulnerability exists in the Microsoft Internet Explorer while handling malicious input in HTML content.of a web page. A remote attacker could exploit the vulnerability by hosting specially crafted HTML file on a website and enticing a user to visit the website and open the crafted HTML file . Successful exploitation of the vulnerability results in memory corruption which allows attacker to execute arbitrary code on the target system

Workarounds

  • Set Internet and Local intranet security zone settings to "High" to block ActiveX Controls and Active Scripting in these zones
  • Add sites that you trust to the Internet Explorer Trusted sites zone
  • Configure Internet Explorer to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone


3.  Improper Ref Counting Use After Free Vulnerability ( CVE-2012-4787   )

This vulnerability exists in the Microsoft Internet explorer due to an error while handling the  access request for memory resources  for those objects that has not been correctly initialized or  has been deleted. A remote attacker could exploit the vulnerability by hosting specially crafted HTML file on a website and enticing a user to visit the website and open the crafted HTML file . Successful exploitation of the vulnerability results in memory corruption which allows attacker to execute arbitrary code on the target system

Workarounds

  • Set Internet and Local intranet security zone settings to "High" to block ActiveX Controls and Active Scripting in these zones
  • Add sites that you trust to the Internet Explorer Trusted sites zone
  • Configure Internet Explorer to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone


Solution

Apply appropriate patches as mentioned in Microsoft Security Bulletin MS12-077

Vendor Information

Microsoft
http://technet.microsoft.com/en-us/security/bulletin/ms12-077

References

Microsoft
http://technet.microsoft.com/en-us/security/bulletin/ms12-077

CISCO
http://tools.cisco.com/security/center/viewAlert.x?alertId=27532
http://tools.cisco.com/security/center/viewAlert.x?alertId=27533
http://tools.cisco.com/security/center/viewAlert.x?alertId=27534

CVE Name
CVE-2012-4781
CVE-2012-4782
CVE-2012-4787

Disclaimer

The information provided herein is on "as is" basis, without warranty of any kind.

Contact Information

Email: info@cert-in.org.in
Phone: +91-11-24368572

Postal address

Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India

 
Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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