Zimbra Police ✦ Plus

The Zimbra Police: Anatomy of a Persistent Cross-Site Scripting (XSS) Campaign Subject: Cyber Threat Intelligence / Email Security Date: October 26, 2023

The "Zimbra Police" in this context refers to the extortionists who, after deploying ransomware, leave a .txt file in the /opt/zimbra/jetty/webapps/zimbra/public/ directory titled POLICE_NOTICE.txt , ironically mimicking law enforcement language: "Your security negligence has been noted. A fine of 20 BTC is due immediately."

: Limits the number of emails a user can send or receive over a specific period to prevent account compromise from flooding the server. zimbra police

This is the single most effective control. Zimbra (now owned by Synacor/Alludo) releases patches regularly.

Zimbra Collaboration Suite (ZCS) is a widely deployed email and collaboration platform used by governments, financial institutions, and enterprises globally. Due to its high-value target status, it has frequently been the subject of exploitation. The Zimbra Police: Anatomy of a Persistent Cross-Site

MFA or 2FA with Zimbra and mobile devices. (SOLVED) - Page 3

Zimbra Security and Hardening Service - Mission Critical Email MFA or 2FA with Zimbra and mobile devices

: A temporary rejection of emails from unknown senders to filter out bots.

Recent law enforcement and cybersecurity investigations have highlighted significant threats targeting government Zimbra instances:

The "Zimbra Police" campaign underscores a critical reality in cybersecurity: the email server remains the soft underbelly of enterprise security. By exploiting client-side vulnerabilities like XSS, attackers bypass traditional network perimeter defenses.

Administrators should enforce a strict Content Security Policy on the Zimbra proxy to restrict the execution of unauthorized scripts.