Remote code execution in LibreOffice for Windows

1) Security features bypass

EUVDB-ID: #VU52290

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 - Security Features

Exploit availability: No

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: 7.0.0.1 - 7.1.1.2

External links

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

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open a file.

Is there known malware, which exploits this vulnerability?

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