CVE-2021-25636

published 2022-02-24

CVE-2021-25636: LibreOffice supports digital signatures of ODF documents and macros within documents, presenting visual aids that no alteration of the document occurred since…

Priority P3 42 high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C N I H A N

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.

Affected

8 ranges

Vendor	Product	Version range	Fixed in
debian	libreoffice	< libreoffice 1:7.3.0-1 (bookworm)	libreoffice 1:7.3.0-1 (bookworm)
fedoraproject	fedora	—	—
libreoffice	libreoffice	>= 0 < 1:7.0.4-4+deb11u2	1:7.0.4-4+deb11u2
libreoffice	libreoffice	>= 0 < 1:7.3.0-1	1:7.3.0-1
libreoffice	libreoffice	>= 0 < 1:7.3.0-1	1:7.3.0-1
libreoffice	libreoffice	>= 0 < 1:7.3.0-1	1:7.3.0-1
libreoffice	libreoffice	>= 7.2.0 < 7.2.5	7.2.5
the_document_foundation	libreoffice	>= 7.2 < 7.2.5	7.2.5

CVSS provenance

nvd v3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

nvd v2.0 5.0 MEDIUM AV:N/AC:L/Au:N/C:N/I:P/A:N

osv 7.5 HIGH

vendor_debian 7.5 HIGH

vendor_redhat 7.5 HIGH

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.

CWE-347 CWE-295