LibreLogo global-event script execution

Vulnerability Description

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. Protection was added, to address CVE-2019-9848, to block calling LibreLogo from document event script handers, e.g. mouse over. However LibreOffice also has a separate feature where documents can specify that pre-installed scripts can be executed on various global script events such as document-open, etc. In the fixed versions, global script event handlers are validated equivalently to document script event handlers. This issue affects: Document Foundation LibreOffice versions prior to 6.2.6.

References

• https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9851
• https://seclists.org/bugtraq/2019/Aug/28
• https://www.debian.org/security/2019/dsa-4501
• http://packetstormsecurity.com/files/154168/LibreOffice-Macro-Python-Code-Execution.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PMEGUWMWORC3DOVEHVXLFT3A5RSCMLBH/
• https://usn.ubuntu.com/4102-1/
• http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00006.html
• http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.html
• https://lists.debian.org/debian-lts-announce/2019/10/msg00005.html