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Zimbra XSS Flaw Allows Hackers to Execute Malicious JavaScript Code Guru Baran

A critical security flaw has been discovered in the Zimbra Collaboration Suite (ZCS), potentially allowing hackers to execute malicious JavaScript code.

This cross-site scripting (XSS) flaw, identified as CVE-2024-33533, has been found in the Zimbra webmail admin interface. The vulnerability arises from inadequate input validation, which permits attackers to inject harmful scripts into the application.

The CVE-2024-33533 vulnerability is classified as a reflected XSS flaw. It occurs when user-supplied data is included in the web application’s response without proper validation or escaping. This allows attackers to craft URLs that, when clicked by unsuspecting users, execute malicious scripts in the context of the victim’s browser session.

The impact of this vulnerability is severe, as it can lead to unauthorized access to sensitive information, session hijacking, and potentially full control over the affected user’s session. The exploitation of such vulnerabilities is often straightforward, requiring only that the victim clicks on a specially crafted link.

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Alongside CVE-2024-33533, two other vulnerabilities have been identified:

• CVE-2024-33536: A security flaw has been found in Zimbra Collaboration (ZCS) versions 9.0 and 10.0. This vulnerability is due to insufficient validation of the res parameter, which enables a logged-in attacker to insert and run unauthorized JavaScript code in the context of another user’s web session.
• CVE-2024-33535: This involves an unauthenticated local file inclusion (LFI) vulnerability in Zimbra Collaboration versions 9.0 and 10.0. This flaw allows attackers to include files on the server via the web application, which can lead to further exploitation.

Zimbra has acknowledged these vulnerabilities and is working on a patch to address them. In the interim, users are advised to implement manual workarounds where possible, such as modifying specific configuration files to escape potentially harmful inputs.

Security experts emphasize the importance of applying patches promptly once they are released and recommend that organizations using Zimbra Collaboration Suite review their security policies and practices to mitigate potential risks.

Organizations using the Zimbra Collaboration Suite should remain vigilant and proactive in applying security updates and monitoring for suspicious activity. As cross-site scripting remains a prevalent threat, robust input validation and output encoding practices are essential to prevent such vulnerabilities.

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