LibreOffice has a feature where documents can specify that pre-installed scripts can be executed on various document events such as mouse-over, etc. LibreOffice is typically also bundled with LibreLogo, a programmable turtle vector graphics script, which can be manipulated into executing arbitrary python commands. By using the document event feature to trigger LibreLogo to execute python contained within a document a malicious document could be constructed which would execute arbitrary python commands silently without warning. In the fixed versions, LibreLogo cannot be called from a document event handler. This issue affects: Document Foundation LibreOffice versions prior to 6.2.5.

References

• https://nvd.nist.gov/vuln/detail/CVE-2019-9848
• https://lists.debian.org/debian-lts-announce/2019/10/msg00005.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PMEGUWMWORC3DOVEHVXLFT3A5RSCMLBH/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XPTZJCNN52VNGSVC5DFKVW3EDMRDWKMP/
• https://seclists.org/bugtraq/2019/Aug/28
• https://security.gentoo.org/glsa/201908-13
• https://usn.ubuntu.com/4063-1/
• https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9848
• http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00006.html
• http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.html
• http://www.securityfocus.com/bid/109374