May 8, 2012
Microsoft .NET Framework is prone to a remote code-execution vulnerability. An attacker can exploit this issue by enticing an unsuspecting victim to run a malicious .NET application or visit a site that hosts the malicious content as an Extensible Application Markup Language (XAML) browser application. This will allow attackers to break out of the Code Access Security (CAS) sandbox. Successful exploits may allow an attacker to execute arbitrary code with the privileges of the currently logged-in user. Failed attacks will cause denial-of-service conditions.
- Avaya Aura Conferencing 6.0 SP1 Standard
- Avaya Aura Conferencing 6.0 Standard
- Avaya Aura Conferencing 6.0.0 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 Messaging Application Server 5
- Avaya Messaging Application Server 5.2
- Microsoft .NET Framework 1.0 SP1
- Microsoft .NET Framework 1.0 SP2
- Microsoft .NET Framework 1.0 SP3
- Microsoft .NET Framework 1.1 SP1
- Microsoft .NET Framework 2.0 SP1
- Microsoft .NET Framework 2.0 SP2
- Microsoft .NET Framework 3.0 SP2
- Microsoft .NET Framework 3.5
- Microsoft .NET Framework 3.5 SP1
- Microsoft .NET Framework 3.5.1
- Microsoft .NET Framework 4.0
Block external access at the network boundary, unless external parties require service.
If global access isn't needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of successful exploits.
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.
Do not follow links provided by unknown or untrusted sources.
Attackers could exploit this vulnerability by enticing a user to visit a malicious website. Do not follow links provided by sources of questionable integrity.
Set web browser security to disable the execution of script code or active content.
Disable support for script code and active content within a client browser to reduce the chances of a successful exploit. Note that this mitigation tactic might adversely affect legitimate websites that rely on the execution of browser-based script code.
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 more information.
James Forshaw of Context Information Security
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