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CVE-2021-25633

Published: 11 October 2021

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 combine multiple certificate data, which when opened caused LibreOffice to display a validly signed indicator but whose content was unrelated to the signature shown. This issue affects: The Document Foundation LibreOffice 7-0 versions prior to 7.0.6; 7-1 versions prior to 7.1.2.

Notes

AuthorNote
mdeslaur
The code changes required to fix this issue in Ubuntu 18.04 LTS
are extensive. We will not be fixing this issue in Ubuntu 18.04
LTS.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

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

trusty Ignored
(end of standard support)
upstream
Released (7.0.6,7.1.2,1:7.2.0-2)
xenial Ignored
(end of standard support)
bionic Ignored

focal
Released (1:6.4.7-0ubuntu0.20.04.2)
hirsute Not vulnerable
(1:7.1.2~rc2-0ubuntu2)
impish Not vulnerable
(1:7.2.1-0ubuntu3)
Patches:
upstream: https://github.com/LibreOffice/core/commit/ad5930e87e788780a255523f106deb1dde5d7b37 (bp)
upstream: https://github.com/LibreOffice/core/commit/a1cf770c2d7ca3e153e0b1f01ddcc313bc2bed7f

Severity score breakdown

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