#VU78242 Cross-site scripting in Zimbra Collaboration - CVE-2023-37580

Vulnerability identifier: #VU78242

Vulnerability risk: High

CVSSv4.0: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:A/U:Amber]

CVE-ID: CVE-2023-37580

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Zimbra Collaboration
Web applications / Webmail solutions

Vendor: Synacor Inc.

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 in the Zimbra Classic Web Client. 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 exploited in the wild.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Zimbra Collaboration: 8.8.15 Patch 1 - 8.8.15

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External links
https://info.zimbra.com/security-update-zimbra-collaboration-suite-version-8.8.15-important
https://twitter.com/maddiestone/status/1679542322772721664
https://wiki.zimbra.com/wiki/Security_Center#ZCS_8.8.15_Patch_41_Released

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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.