CVE-2021-25634

Timestamp Manipulation with Signature Wrapping

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

LibreOffice soporta firmas digitales de documentos ODF y macros dentro de documentos, presentando ayudas visuales de que no se ha producido ninguna alteración del documento desde la última firma y que la firma es válida. Una vulnerabilidad de Comprobación Inapropiada de Certificados en LibreOffice permitía a un atacante modificar un documento ODF firmado digitalmente para insertar una marca de tiempo de firma adicional que LibreOffice presentaría incorrectamente como una firma válida firmada en la hora de firma falsa. Este problema afecta a: Las versiones de LibreOffice 7-0 de The Document Foundation anteriores a 7.0.6; las versiones 7-1 anteriores a 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.

*Credits: NDS of Ruhr University Bochum

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-01-19 CVE Reserved
2021-10-12 CVE Published
2024-08-19 EPSS Updated
2024-09-17 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-295: Improper Certificate Validation

CAPEC

References (4)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.debian.org/security/2021/dsa-4988	2021-10-18
https://www.libreoffice.org/about-us/security/advisories/CVE-2021-25634	2021-10-18
https://access.redhat.com/security/cve/CVE-2021-25634	2022-05-10
https://bugzilla.redhat.com/show_bug.cgi?id=2013151	2022-05-10

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Libreoffice Search vendor "Libreoffice"		Libreoffice Search vendor "Libreoffice" for product "Libreoffice"				>= 7.0.0 < 7.0.6 Search vendor "Libreoffice" for product "Libreoffice" and version " >= 7.0.0 < 7.0.6"		-		Affected
Libreoffice Search vendor "Libreoffice"		Libreoffice Search vendor "Libreoffice" for product "Libreoffice"				>= 7.1.0 < 7.1.2 Search vendor "Libreoffice" for product "Libreoffice" and version " >= 7.1.0 < 7.1.2"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				11.0 Search vendor "Debian" for product "Debian Linux" and version "11.0"		-		Affected