Cross-site scripting in Roundcube

1) Cross-site scripting

EUVDB-ID: #VU82083

Risk: High

CVSSv3.1: 5.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:H/RL:O/RC:C]

CVE-ID: CVE-2023-5631

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed 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 SVG files in program/lib/Roundcube/rcube_washtml.php. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code 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.

Note, the vulnerability is being actively exploited in the wild.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Roundcube: 1.0.0 - 1.6.3

External links

http://github.com/roundcube/roundcubemail/releases/tag/1.6.4
http://github.com/roundcube/roundcubemail/releases/tag/1.5.5
http://github.com/roundcube/roundcubemail/releases/tag/1.4.15
http://www.welivesecurity.com/en/eset-research/winter-vivern-exploits-zero-day-vulnerability-roundcube-webmail-servers/

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?

Yes. This vulnerability is being exploited in the wild.