Zero-Day Flaw in Zimbra Email Software Exploited by Four Hacker Groups

Zero-Day Flaw in Zimbra Email Software Exploited by Four Hacker Groups

November 16, 2023 at 11:48AM

A zero-day flaw in the Zimbra Collaboration email software was exploited by four different groups, resulting in the theft of email data, user credentials, and authentication tokens. The flaw, tracked as CVE-2023-37580, allowed the execution of malicious scripts by tricking users into clicking on a specially crafted URL. The attacks occurred even after a fix was released, highlighting the importance of promptly applying patches to mail servers.

Key Takeaways from Meeting Notes:

– Zero-day vulnerability in Zimbra Collaboration email software exploited by four different groups.
– Flaw tracked as CVE-2023-37580, a reflected cross-site scripting (XSS) vulnerability.
– Successful exploitation allows execution of malicious scripts by tricking users into clicking on a specially crafted URL.
– Google Threat Analysis Group (TAG) discovered multiple campaign waves starting June 29, 2023.
– Three campaigns observed before patch release, fourth campaign detected a month after publication.
– First campaign targeted a government organization in Greece, delivering email-stealing malware.
– Second threat actor Winter Vivern targeted government organizations in Moldova and Tunisia.
– Third group phished for credentials belonging to a government organization in Vietnam.
– A government organization in Pakistan was targeted on August 25, resulting in exfiltration of Zimbra authentication token.
– Threat actors regularly exploit XSS vulnerabilities in mail servers, emphasizing the need for thorough auditing and prompt application of fixes.

Please note that these takeaways are based on the provided meeting notes. For any further clarifications or additional information, please let me know.

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