Microsoft Internet Explorer VML Memory Corruption CVE-2011-1266 Remote Code Execution Vulnerability

Description

Microsoft Internet Explorer is prone to a remote code-execution vulnerability due to a memory-corruption error. Attackers can exploit this issue by enticing an unsuspecting user to view a specially crafted webpage. Successful exploits may allow attackers to execute arbitrary code with the privileges of the user running the affected application. Failed exploit attempts will likely result in a denial-of-service condition.

Technologies Affected

• Avaya Aura Conferencing 6.0 Standard
• Avaya CallPilot 4.0
• Avaya CallPilot 5.0
• Avaya Communication Server 1000 Telephony Manager 3.0
• Avaya Communication Server 1000 Telephony Manager 4.0
• Avaya Meeting Exchange - Client Registration Server
• Avaya Meeting Exchange - Recording Server
• Avaya Meeting Exchange - Streaming Server
• Avaya Meeting Exchange - Web Conferencing Server
• Avaya Meeting Exchange - Webportal
• Avaya Meeting Exchange 5.0
• Avaya Meeting Exchange 5.0 SP1
• Avaya Meeting Exchange 5.0 SP2
• Avaya Meeting Exchange 5.0.0.0.52
• Avaya Meeting Exchange 5.1
• Avaya Meeting Exchange 5.1 SP1
• Avaya Meeting Exchange 5.2
• Avaya Meeting Exchange 5.2 SP1
• Avaya Meeting Exchange 5.2 SP2
• Avaya Messaging Application Server 4
• Avaya Messaging Application Server 5
• Avaya Messaging Application Server 5.2
• Microsoft Internet Explorer 6.0
• Microsoft Internet Explorer 6.0 SP1
• Microsoft Internet Explorer 7.0
• Microsoft Internet Explorer 7.0
• Microsoft Internet Explorer 7.0 Beta
• Microsoft Internet Explorer 7.0 Beta1
• Microsoft Internet Explorer 7.0 Beta2
• Microsoft Internet Explorer 7.0 Beta3
• Microsoft Internet Explorer 7.0.5730.11
• Microsoft Internet Explorer 8
• Microsoft Internet Explorer 8 Beta 1
• Microsoft Internet Explorer 8 Beta 2
• Microsoft Internet Explorer 8 RC1
• Microsoft Internet Explorer 8.0.7600.16385

Recommendations

Run all software as a nonprivileged user with minimal access rights.
To reduce the impact of latent vulnerabilities, always run nonadministrative software as an unprivileged user with minimal access rights.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of suspicious or anomalous activity. This may help detect malicious actions that an attacker may take after successfully exploiting vulnerabilities in applications. Review all applicable logs regularly.

Do not accept or execute files from untrusted or unknown sources.
To reduce the likelihood of successful exploits, never handle files that originate from unfamiliar or untrusted sources.

Do not follow links provided by unknown or untrusted sources.
Web users should be cautious about following links to sites that are provided by unfamiliar or suspicious sources. Filtering HTML from emails may help remove a possible vector for transmitting malicious links to users.

Implement multiple redundant layers of security.
Since this issue may be leveraged to execute code, we recommend memory-protection schemes, such as nonexecutable stack/heap configurations and randomly mapped memory segments. This tactic may complicate exploits of memory-corruption vulnerabilities.

Vendor updates are available. Please see the references for details.