Debian update for libreoffice

Published: 2021-10-19

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-25633 CVE-2021-25634
CWE-ID	CWE-295 CWE-347
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	libreoffice (Debian package) Operating systems & Components / Operating system package or component
Vendor	Debian

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper Certificate Validation

EUVDB-ID: #VU57214

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-25633

CWE-ID: CWE-295 - Improper Certificate Validation

Exploit availability: No

Description

The vulnerability allows a remote user to perform spoofing attack.

The vulnerability exists due to application does not properly check for digital signatures of ODF files. A remote attacker can 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.

Mitigation

Update libreoffice package to version 1:7.0.4-4+deb11u1.

Vulnerable software versions

libreoffice (Debian package): before 1:7.0.4-4+deb11u1

CPE2.3

cpe:2.3:a:debian:libreoffice_debian_package:*:*:*:*:*:debian_linux:*:*

External links

https://www.debian.org/security/2021/dsa-4988

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Improper Verification of Cryptographic Signature

EUVDB-ID: #VU57213