#VU57214 Improper Certificate Validation in LibreOffice - CVE-2021-25633
Vulnerability identifier: #VU57214
Vulnerability 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:
CWE-ID:
CWE-295
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
LibreOffice
Client/Desktop applications /
Office applications
Vendor: LibreOffice
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
Install updates from vendor's website.
Vulnerable software versions
LibreOffice: before 7.0.6.1, 7.1.2.1, 7.0.6.1, 7.0.6.1
External links
https://www.libreoffice.org/about-us/security/advisories/cve-2021-25633/
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.
