CVE-2020-10194 : Exploit Details and Defense Strategies

Zimbra zm-mailbox before 8.8.15.p8 allows authenticated users to request any GAL account, deviating from the intended behavior.

Understanding CVE-2020-10194

This CVE involves a vulnerability in Zimbra zm-mailbox that enables authenticated users to access any GAL account, contrary to the expected domain matching requirement.

What is CVE-2020-10194?

cs/service/account/AutoCompleteGal.java in Zimbra zm-mailbox before 8.8.15.p8 allows authenticated users to request any GAL account. This differs from the intended behavior in which the domain of the authenticated user must match the domain of the galsync account in the request.

The Impact of CVE-2020-10194

The vulnerability allows authenticated users to bypass domain matching restrictions, potentially leading to unauthorized access to GAL accounts.

Technical Details of CVE-2020-10194

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The issue lies in the AutoCompleteGal.java file in Zimbra zm-mailbox, where authenticated users can request any GAL account, circumventing domain restrictions.

Affected Systems and Versions

Affected Version: Zimbra zm-mailbox before 8.8.15.p8
All systems running versions prior to 8.8.15.p8 are vulnerable to this exploit.

Exploitation Mechanism

Authenticated users can exploit this vulnerability to access GAL accounts without domain matching verification.

Mitigation and Prevention

Protecting systems from CVE-2020-10194 requires immediate actions and long-term security practices.

Immediate Steps to Take

Upgrade Zimbra zm-mailbox to version 8.8.15.p8 or later to mitigate the vulnerability.
Monitor GAL account access for any suspicious activities.

Long-Term Security Practices

Implement strict access controls and authentication mechanisms.
Regularly update and patch software to address security flaws.

Patching and Updates

Apply patches and updates provided by Zimbra to fix the vulnerability and enhance system security.