Weak Master Keys

Vulnerability Description

LibreOffice supports the storage of passwords for web connections in the user’s configuration database. The stored passwords are encrypted with a single master key provided by the user. A flaw in LibreOffice existed where master key was poorly encoded resulting in weakening its entropy from 128 to 43 bits making the stored passwords vulerable to a brute force attack if an attacker has access to the users stored config. This issue affects: The Document Foundation LibreOffice 7.2 versions prior to 7.2.7; 7.3 versions prior to 7.3.3.

References

• https://www.libreoffice.org/about-us/security/advisories/cve-2022-26307
• http://www.openwall.com/lists/oss-security/2022/08/13/2
• https://lists.debian.org/debian-lts-announce/2023/03/msg00022.html