December 14, 2010
Microsoft SharePoint is prone to a remote code-execution vulnerability.
An attacker can exploit this issue to execute arbitrary code within the privileges of the guest account on the SharePoint server. Failed exploit attempts will result in a denial-of-service condition.
- Microsoft SharePoint Server 2007
- Microsoft SharePoint Server 2007 SP1
- Microsoft SharePoint Server 2007 SP2
- Microsoft SharePoint Server 2007 x64
- Microsoft SharePoint Server 2007 x64 SP1
- Microsoft SharePoint Server 2007 x64 SP2
Block external access at the network boundary, unless external parties require service.
If global access isn't needed, block access at the network perimeter to computers hosting the vulnerable application.
Run all software as a nonprivileged user with minimal access rights.
To limit the potential damage that a successful exploit may achieve, run all nonadministrative software as a regular user with the least amount of privileges required to successfully operate.
Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity such as unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits.
Implement multiple redundant layers of security.
Since these issues 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.
Oleksandr Mirosh, working with TippingPoint's Zero Day Initiative
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