SB2018102612 - Remote code execution in Microsoft Word

Description

This security bulletin contains information about 1 security vulnerability.

1) Logic error (CVE-ID: N/A)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to a logical bug is revealed when embedding a video via the 'online video' feature. A remote attacker can embed a video inside a Word document, edit the XML file named document.xml, replace the video link with a crafted payload created by the attacker which opens Internet Explorer Download Manager with the embedded code execution file and execute arbitrary code with elevated privileges.

Successful exploitation of the vulnerability may result in system compromise.

Note: as of October 31, 2018 the vulnerability is being actively exploited in the wild.

Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References

• https://blog.cymulate.com/abusing-microsoft-office-online-video
• https://blog.trendmicro.com/trendlabs-security-intelligence/hide-and-script-inserted-malicious-urls-...