October 13, 2015
Microsoft Office Web Apps Server is prone to a security vulnerability that may allow attackers to conduct spoofing attacks. An attacker can exploit this issue to conduct spoofing attacks and perform unauthorized actions; other attacks are also possible.
- Microsoft Excel Services on Microsoft SharePoint Server 2010 Service Pack 2
- Microsoft Excel Services on Microsoft SharePoint Server 2013 Service Pack 1
- Microsoft Excel Web App 2010 Service Pack 2
- Microsoft Office Web Apps Server 2013 SP1
- Microsoft SharePoint Foundation 2013 SP1
- Microsoft Web Applications 2010 Sp2
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.
Updates are available. Please see the references or vendor advisory for more information.
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