Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2021-25635

Severity CVSS v4.0:
MEDIUM
Type:
CWE-295 Improper Certificate Validation
Publication date:
21/03/2025
Last modified:
21/03/2025

Description

An Improper Certificate Validation vulnerability in LibreOffice allowed <br /> an attacker to self sign an ODF document, with a signature untrusted by <br /> the target, then modify it to change the signature algorithm to an <br /> invalid (or unknown to LibreOffice) algorithm and LibreOffice would incorrectly present such a signature with an unknown algorithm as a <br /> valid signature issued by a trusted person<br /> <br /> <br /> This issue affects LibreOffice: from 7.0 before 7.0.5, from 7.1 before 7.1.1.

Impact

Vector 4.0
CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:H/SI:H/SA:H CVSS v4.0 Severity and Metrics:

Base Score: 5.20 MEDIUM
Vector: CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:H/SI:H/SA:H

Attack Vector (AV): Local
Attack Complexity (AC): High
Attack Requirements (AT): None
Privileges Required (PR): None
User Interaction (UI): Passsive
Confidentiality (VC): Low
Integrity (VI): Low
Availability (VA): None
Confidentiality (SC): High
Integrity (SI): High
Availability (SA): High

Base Score 4.0
5.20
Severity 4.0
MEDIUM

References to Advisories, Solutions, and Tools