Microsoft Office is prone to a remote code-execution vulnerability. An attacker may exploit this issue by enticing a victim into opening a malicious Office file. Successful exploits will allow attackers to execute arbitrary code in the context of the currently logged-in user. Failed exploit attempts will likely result in denial-of-service conditions.
Run all software as a nonprivileged user with minimal access rights.
Ensure that all non-administrative tasks are performed 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.
Users should never accept files from untrusted or unknown sources, because they may be malicious in nature. Avoid opening email attachments from unknown or questionable sources.
Do not follow links provided by unknown or untrusted sources.
Users should avoid websites of questionable integrity. Never follow links supplied by unknown or untrusted sources.
Implement multiple redundant layers of security.
Since this issue may be leveraged to execute code, we recommend memory-protection schemes, such as non-executable stack/heap configurations and randomly mapped memory segments. This tactic may complicate exploits of memory-corruption vulnerabilities.
Microsoft has released security advisories MS07-025 and MS08-015, along with fixes to address this issue. Please see the references for more information. KB934873 has been updated to inform users of a potential problem with the installation of fixes. Fixes may not have been successfully installed if either Microsoft Update or Microsoft Windows Server Update Services were used to install fixes on Windows Vista computers running Office 2007. Please see the references for more information about this issue.