January 8, 2019
Microsoft Word is prone to a remote code-execution vulnerability. An attacker can leverage this issue to execute arbitrary code in the context of the currently logged-in user. Failed exploit attempts will likely result in denial of service conditions.
- Microsoft Office 2010 (32-bit edition) SP2
- Microsoft Office 2010 (64-bit edition) SP2
- Microsoft Office 2016 for Mac
- Microsoft Office 2019 for 32-bit editions
- Microsoft Office 2019 for 64-bit editions
- Microsoft Office 2019 for Mac
- Microsoft Office 365 ProPlus for 32-bit Systems
- Microsoft Office 365 ProPlus for 64-bit Systems
- Microsoft Office Online Server
- Microsoft Office Web Apps Server 2010 Service Pack 2
- Microsoft Office Word Viewer
- Microsoft SharePoint Enterprise Server 2013 Service Pack 1
- Microsoft SharePoint Enterprise Server 2016
- Microsoft SharePoint Server 2019
- Microsoft Word 2010 Service Pack 2 (32-bit editions)
- Microsoft Word 2010 Service Pack 2 (64-bit editions)
- Microsoft Word 2013 RT Service Pack 1
- Microsoft Word 2013 Service Pack 1 (32-bit editions)
- Microsoft Word 2013 Service Pack 1 (64-bit editions)
- Microsoft Word 2016 (32-bit edition)
- Microsoft Word 2016 (64-bit edition)
- Microsoft Word Automation Services on Microsoft SharePoint Server 2010 SP2
Run all software as a nonprivileged user with minimal access rights.
To mitigate the impact of a successful exploit, run the affected application as a 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.
Never accept files from untrusted or unknown sources, because they may be malicious in nature. Avoid opening email attachments from unknown or questionable sources.
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 exploit attempts of memory-corruption vulnerabilities.
Updates are available. Please see the references or vendor advisory for more information.
Jaanus Kp, Clarified Security working with Trend Micro’s Zero Day Initiative
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