CVE-2018-20160 : What You Need to Know

ZxChat (ZeXtras Chat) in Synacor Zimbra Collaboration Suite versions 8.7 and 8.8 has a vulnerability enabling XXE attacks.

Understanding CVE-2018-20160

What is CVE-2018-20160?

ZxChat, also known as ZeXtras Chat, in Synacor Zimbra Collaboration Suite versions 8.7 and 8.8, and other products, is susceptible to XXE attacks. An attacker can exploit this by sending a specially crafted XML request to mailboxd.

The Impact of CVE-2018-20160

This vulnerability allows malicious actors to perform XXE attacks, potentially leading to unauthorized access to sensitive information or system compromise.

Technical Details of CVE-2018-20160

Vulnerability Description

ZxChat in Synacor Zimbra Collaboration Suite versions 8.7 and 8.8, and other products, is vulnerable to XXE attacks through manipulated XML requests to mailboxd.

Affected Systems and Versions

Synacor Zimbra Collaboration Suite versions 8.7 and 8.8
Other products utilizing ZxChat (ZeXtras Chat)

Exploitation Mechanism

The vulnerability can be exploited by sending a specifically crafted XML request to mailboxd, allowing attackers to execute XXE attacks.

Mitigation and Prevention

Immediate Steps to Take

Apply security patches provided by the vendor promptly.
Monitor network traffic for any suspicious activity related to XML requests.
Implement strict input validation mechanisms to prevent malicious XML input.

Long-Term Security Practices

Regularly update and patch all software components to mitigate known vulnerabilities.
Conduct security assessments and penetration testing to identify and address potential weaknesses.

Patching and Updates

Stay informed about security advisories and updates from Synacor Zimbra Collaboration Suite and related products.