CVE-2019-9855: document foundation libreoffice Communication Channel Errors

Vulnerability summary

CVE-2019-9855 is a critical (CVSS 9.8) Communication Channel Errors vulnerability in document foundation libreoffice. EPSS estimates a 2.65% chance of exploitation in the next 30 days, higher than 85.3% of scored vulnerabilities.

Timeline

1. 06-09-2019
   PublishedVulnerability first disclosed.
2. 16-09-2024
   Last modifiedVulnerability information updated.

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.

• CWE-417Communication Channel ErrorsWeaknesses in this category are related to improper handling of communication channels and access paths. These weaknesses include problems in creating, managing, or removing alternate channels and alternate paths. Some of these can overlap virtual file problems and are commonly used in "bypass" attacks, such as those that exploit authentication errors.