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CVE-2022-26305

Published: 25 July 2022

An Improper Certificate Validation vulnerability in LibreOffice existed where determining if a macro was signed by a trusted author was done by only matching the serial number and issuer string of the used certificate with that of a trusted certificate. This is not sufficient to verify that the macro was actually signed with the certificate. An adversary could therefore create an arbitrary certificate with a serial number and an issuer string identical to a trusted certificate which LibreOffice would present as belonging to the trusted author, potentially leading to the user to execute arbitrary code contained in macros improperly trusted. This issue affects: The Document Foundation LibreOffice 7.2 versions prior to 7.2.7; 7.3 versions prior to 7.3.1.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
libreoffice
Launchpad, Ubuntu, Debian
lunar Not vulnerable

bionic
Released (1:6.0.7-0ubuntu0.18.04.12)
focal
Released (1:6.4.7-0ubuntu0.20.04.5)
jammy Not vulnerable
(1:7.3.3-0ubuntu0.22.04.1)
trusty Ignored
(end of standard support)
upstream
Released (1:7.3.2~rc2-1)
kinetic Not vulnerable

xenial Ignored
(end of standard support)
Patches:
upstream: https://github.com/LibreOffice/core/commit/a7aaa78acea4c1d51283c2fce54ff9f5339026f8 (7.2)
upstream: https://github.com/LibreOffice/core/commit/bae5503ac47ac2faa4c4365f86a00543e43a149a (7.2)
upstream: https://github.com/LibreOffice/core/commit/0ce93b38af84453aba8002c098ac168b0fadfc97 (6.4)
upstream: https://github.com/LibreOffice/core/commit/2c8c221b88f2e2bb5b29a6c1bcce1ea75e98136a (6.1)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H