Zero-day vulnerability in Zimbra Collaboration

Cross-site scripting
CVE-2023-37580

Vulnerability details

Advisory: SB2023071343 - Reflected XSS in Zimbra Collaboration Suite

Vulnerable component: Zimbra Collaboration

CVE-ID: CVE-2023-37580

CVSSv3 score: 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

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

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.

External links:

https://twitter.com/maddiestone/status/1679542322772721664

https://info.zimbra.com/security-update-zimbra-collaboration-suite-version-8.8.15-important

https://wiki.zimbra.com/wiki/Security_Center#ZCS_8.8.15_Patch_41_Released

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.