Vulnerability identifier: #VU28979

Vulnerability risk: Medium

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-13965

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Roundcube
Web applications / Webmail solutions

Vendor: Roundcube

Description

The vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data when processing data passed via a malicious XML attachment because text/xml is among the allowed types for a preview. A remote attacker can open a specially crafted email and arbitrary JavaScript code will be executed in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Roundcube: 1.3.0 - 1.3.11, 1.4.0 - 1.4.4

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External links
http://github.com/roundcube/roundcubemail/commit/884eb611627ef2bd5a2e20e02009ebb1eceecdc3
http://github.com/roundcube/roundcubemail/compare/1.4.4...1.4.5
http://github.com/roundcube/roundcubemail/releases/tag/1.3.12
http://github.com/roundcube/roundcubemail/releases/tag/1.4.5
http://roundcube.net/news/2020/06/02/security-updates-1.4.5-and-1.3.12

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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.