Vulnerability identifier: #VU10444

Vulnerability risk: Low

CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-6871, CVE-2018-1055

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
LibreOffice
Client/Desktop applications / Office applications

Vendor: LibreOffice

Description
The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists in LibreOffice Calc, which supports COM.MICROSOFT.WEBSERVICE function to obtain data by URL. The application allows WEBSERVICE to take a local file URL (e.g file://) which can be used to inject local files into the spreadsheet without warning the user. Subsequent formulas can operate on that inserted data and construct a remote URL. A remote attacker can create a specially crafted document, trick the victim into opening it and use  WEBSERVICE functionality to send arbitrary local files to the attacker's controlled server.

Mitigation
Update to version 5.4.5.1 or 6.0.1.1.

Vulnerable software versions

LibreOffice: 5.4.4.1 - 5.4.4.2, 5.4.3.1 - 5.4.3.2, 5.4.2.1 - 5.4.2.2, 5.4.1.1 - 5.4.1.2, 5.4.0.1 - 5.4.0.3, 6.0.0.1 - 6.0.0.3

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External links
http://www.libreoffice.org/about-us/security/advisories/cve-2018-1055/

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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. However, proof of concept for this vulnerability is available.