Vulnerability identifier: #VU52290

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-25631

CWE-ID: CWE-254

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
LibreOffice
Client/Desktop applications / Office applications

Vendor: LibreOffice

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to improper input validation when processing hyperlinks in a document. A remote attacker can create a document with a specially crafted hyperlink, trick the victim into clicking the link, bypass implemented restrictions on extensions imposed by the denylist and execute arbitrary commands on the system.

Note, the vulnerability affects Windows installations only.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

LibreOffice: 7.1.1.1 - 7.1.1.2, 7.1.0.1 - 7.1.0.3, 7.0.4.1 - 7.0.4.2, 7.0.3.1, 7.0.2.1 - 7.0.2.2, 7.0.1.1 - 7.0.1.2, 7.0.0.1 - 7.0.0.3

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External links
http://www.libreoffice.org/about-us/security/advisories/cve-2021-25631/

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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.