Vulnerability identifier: #VU82545

Vulnerability 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-2023-43770

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: Yes

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 in program/lib/Roundcube/rcube_string_replacer.php due to insufficient sanitization of user-supplied data passed via text/plain e-mail messages with crafted links. A remote attacker can send a specially crafted email message 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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Roundcube: 1.4.0 - 1.4.13, 1.5.0 - 1.5.3, 1.6.0 - 1.6.2

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External links
http://roundcube.net/news/2023/09/15/security-update-1.6.3-released
http://github.com/roundcube/roundcubemail/commit/e92ec206a886461245e1672d8530cc93c618a49b
http://lists.debian.org/debian-lts-announce/2023/09/msg00024.html

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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?

Yes. This vulnerability is being exploited in the wild.