What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• 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. 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. 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, 30
• 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
• 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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WVSDPZJG3UA43X3JXRHJAWXLDZEW77LM/
• 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-2019-9850
• 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

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