What’s Vulnerable › Vulnerabilities

CVE-2019-9851: LibreLogo global-event script execution

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 77.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-08-15 · updated 2026-06-17
• Weakness: CWE-20

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.

Affected products

• Canonical Ubuntu Linux: 16.04, 18.04, 19.04
• Debian Linux: 8.0, 9.0, 10.0
• Fedoraproject Fedora: 29
• The Document Foundation LibreOffice: before 6.2.6 — fixed in 6.2.6
• openSUSE Leap: 15.0, 15.1

How to fix

Upgrade to a fixed version: The Document Foundation LibreOffice 6.2.6. Check the vendor advisory for mitigations.

References

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

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