What’s Vulnerable › Vulnerabilities

CVE-2019-9855: Windows 8.3 path equivalence handling flaw allows LibreLogo script execution

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-09-06 · updated 2026-06-17
• Weakness: CWE-417

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 block calling LibreLogo from script event handers. However a Windows 8.3 path equivalence handling flaw left LibreOffice vulnerable under Windows that a document could trigger executing LibreLogo via a Windows filename pseudonym. This issue affects: Document Foundation LibreOffice 6.2 versions prior to 6.2.7; 6.3 versions prior to 6.3.1.

Affected products

• The Document Foundation LibreOffice: from 6.2.0 before 6.2.7; from 6.3.0 before 6.3.1 — fixed in 6.2.7, 6.3.1
• openSUSE Leap: 15.0, 15.1

How to fix

Upgrade to a fixed version: The Document Foundation LibreOffice 6.2.7, 6.3.1. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.html
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00055.html
• https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9855/
• http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.html
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00055.html
• https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9855/

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