CVE-2021-25636

Name	CVE-2021-25636
Description	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 create a digitally signed ODF document, by manipulating the documentsignatures.xml or macrosignatures.xml stream within the document to contain both "X509Data" and "KeyValue" children of the "KeyInfo" tag, which when opened caused LibreOffice to verify using the "KeyValue" but to report verification with the unrelated "X509Data" value. This issue affects: The Document Foundation LibreOffice 7.2 versions prior to 7.2.5.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3368-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libreoffice (PTS)	bullseye	1:7.0.4-4+deb11u10	fixed
	bullseye (security)	1:7.0.4-4+deb11u11	fixed
	bookworm, bookworm (security)	4:7.4.7-1+deb12u5	fixed
	sid, trixie	4:24.8.3-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
libreoffice	source	buster	1:6.1.5-3+deb10u8	DLA-3368-1
libreoffice	source	bullseye	1:7.0.4-4+deb11u2
libreoffice	source	(unstable)	1:7.3.0-1

Notes

[stretch] - libreoffice <postponed> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=2056955
https://www.libreoffice.org/about-us/security/advisories/CVE-2021-25636
Fixed by: https://github.com/LibreOffice/core/commit/b0404f80577de9ff69e58390c6f6ef949fdb0139