Oracle Linux: CVE-2021-25634: ELSA-2022-1766: libreoffice security, bug fix, and enhancement update (MODERATE) (Multiple Advisories)

LibreOffice supports digital signatures of ODF documents and macros within documents, presenting visual aids that no alteration of the document occurred since the last signing and that the signature is valid. An Improper Certificate Validation vulnerability in LibreOffice allowed an attacker to modify a digitally signed ODF document to insert an additional signing time timestamp which LibreOffice would incorrectly present as a valid signature signed at the bogus signing time. This issue affects: The Document Foundation LibreOffice 7-0 versions prior to 7.0.6; 7-1 versions prior to 7.1.2.
A flaw was found in LibreOffice, where it inserted a signing timestamp. This flaw allows LibreOffice to present a valid signature due to the altered signing time. The highest threat from this vulnerability is to confidentiality and integrity.