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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2011-0192
Multiple Vulnerabilities in Microsoft Internet Explorer

Original Issue Date:December 14, 2011

Severity Rating: HIGH

Systems Affected

  • Windows XP SP3 and prior
  • Windows XP Professional x64 Edition SP2 and prior
  • Windows Server 2003 SP2 and prior
  • Windows Server 2003 x64 Edition SP2 and prior
  • Windows Vista SP2 and prior
  • Windows Vista x64 Edition SP2 and prior
  • Windows Server 2008 for 32-bit Systems SP2 and prior
  • Windows Server 2008 for x64-based Systems SP2 and prior
  • Windows 7 for 32-bit Systems SP1 and prior
  • Windows 7 for x64-based Systems SP1 and prior
  • Windows Server 2008 R2 for x64-based Systems SP1 and prior
  • Windows Server 2008 R2 for Itanium-based Systems SP1 and prior

Component Affected

  • Internet Explorer 6,7,8,9

Overview

Multiple  vulnerabilities have been reported in Microsoft Internet Explorer that could allow a remote attacker to execute arbitrary code on a targeted system and access sensitive browser-based information.

Description

1. Insecure Library Loading Vulnerability ( CVE-2011-2019   )

The vulnerability exists because of errors in  loading mechanisms while handling .htm or .html files..  A remote attacker could exploit this vulnerability by convincing a user to open a file from a malicious file share to execute arbitrary code on the system with the privileges of the user.

Workarounds

  1. Disable loading of libraries from WebDAV and remote network shares
  2. Disable the WebClient service
  3. Block TCP ports 139 and 445 at the firewall


2. Content-Disposition Header Handling Information Disclosure Vulnerability ( CVE-2011-3404   )

The vulnerability exists because of  errors in handling specially crafted Content-Disposition HTTP headers.  A remote attacker could exploit this vulnerability by convincing a user to view a malicious website to disclose sensitive browser-based information.

3. Cross-Site Scripting Filter File Disclosure Vulnerability ( CVE-2011-1992   )

The vulnerability exists because of the  improper handling of malformed JavaScript code by the Internet Explorer XSS Filter.  A remote attacker could exploit the vulnerability by convincing a user to visit a malicious site and hence disclose  sensitive information

Workarounds

  1. Set Internet and Local intranet security zone settings to "High" to block ActiveX Controls and Active Scripting in these zones
  2. Add sites that you trust to the Internet Explorer Trusted sites zone
  3. 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 MS11-099

Vendor Information

Microsoft
http://technet.microsoft.com/en-us/security/bulletin/MS11-099

References

SecurityTracker
http://securitytracker.com/id/1026413

Cisco
http://tools.cisco.com/security/center/viewAlert.x?alertId=24700
http://tools.cisco.com/security/center/viewAlert.x?alertId=24701
http://tools.cisco.com/security/center/viewAlert.x?alertId=24702

CVE Name
CVE-2011-2019
CVE-2011-3404
CVE-2011-1992

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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