#VU20955 Improper access control in LibreOffice - CVE-2019-9854

Vulnerability identifier: #VU20955

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-9854

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
LibreOffice
Client/Desktop applications / Office applications

Vendor: LibreOffice

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to unsafe URL assembly flaw in allowed script location check. A remote authenticated attacker can execute script in arbitrary locations on the filesystem by employing a URL encoding attack to defeat the path verification step.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

LibreOffice: 6.2.0.0 - 6.2.0.3, 6.2.1.1 - 6.2.1.2, 6.2.2.1 - 6.2.2.2, 6.2.3.1 - 6.2.3.2, 6.2.4.1 - 6.2.4.2, 6.2.5.1 - 6.2.5.2, 6.2.6 - 6.2.6.1, 6.3.0.0 - 6.3.0.2

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External links
https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9854/

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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.