Vulnerability identifier: #VU60293

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-2022-24682

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. 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 in the targeted attacks aimed to exfiltrated data.

Mitigation

Install update from vendor's website.

The vulnerability is resolved in the following patch:

8.8.15.1643980846.p30-1

Vulnerable software versions

Zimbra Collaboration: 8.8.15 - 8.8.15 Patch 29

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External links
http://www.volexity.com/blog/2022/02/03/operation-emailthief-active-exploitation-of-zero-day-xss-vulnerability-in-zimbra/
http://blog.zimbra.com/2022/02/hotfix-available-5-feb-for-zero-day-exploit-vulnerability-in-zimbra-8-8-15/
http://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P30#Security_Hotfix_Alert

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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.