Improper Verification of Cryptographic Signature in LibreOffice - CVE-2021-25634
Published: October 11, 2021
Vulnerability identifier: #VU57213
CSH Severity: Medium
CVSS v4.0: 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-2021-25634
CWE-ID: CWE-347
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: LibreOffice
Affected software:
LibreOffice
LibreOffice
Detailed vulnerability 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 change the signature algorithm in the document to an invalid (or unknown to LibreOffice) algorithm and LibreOffice would incorrectly present such a signature with an unknown algorithm as a valid signature issued by a trusted person.
How to mitigate CVE-2021-25634
Install updates from vendor's website.