Title: CVE-2019-9850 Insufficient url validation allowing LibreLogo script execution

Announced: August 15, 2019

Fixed in: 6.2.6/6.3.0


LibreOffice is typically bundled with LibreLogo, a programmable turtle vector graphics script, which can execute arbitrary python commands contained with the document it is launched from.

LibreOffice also has a feature where documents can specify that pre-installed scripts can be executed on various document script events such as mouse-over, etc

Protection was added, to address CVE-2019-9848, to block calling LibreLogo from script event handers. However an insufficient url validation vulnerability in LibreOffice allowed malicious to bypass that protection and again trigger calling LibreLogo from script event handlers.

In the fixed versions, script urls are correctly decoded before validation


Thanks to alex (@insertscript) for reporting this issue