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REWTERZ THREAT Advisory – LibreOffice and OpenOffice Remote Code Execution Vulnerability

February 6, 2019

SEVERITY: Medium

CATEGORY: Vulnerability

Analysis Summary

By tricking victims into opening an ODT (OpenDocument Text) file embedding an event embedded, it is possible to launch a directory traversal attack executing a python method from a script in any arbitrary file system location. Exploiting CVE-2018-16858, it is possible to trigger the automatic execution of a specific python library included in the suite using a hidden onmouseover event. On further analysis, researchers found out that under certain circumstances it is not only possible to specify the function you want to call inside a python script, but passing parameters is also a possibility.

In the fixed versions, access is restricted to scripts under the share/Scripts/python, user/Scripts/python sub-directories of the LibreOffice install.


Impact

Remote Code Execution

Affected Products

LibreOffice

OpenOffice

Remediation


 While LibreOffice has been fixed with the release of LibreOffice 6.0.7/6.1.3, update to the fixed versions. OpenOffice is still awaiting a fix. Meanwhile, it is possible to remove or rename the pythonscript.py file in the installation folder to disable the support for python.

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