Vulnerability identifier: #VU57214

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-25633

CWE-ID: CWE-295

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
LibreOffice
Client/Desktop applications / Office applications

Vendor:

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

---

External links
http://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.