CVE-2019-19200 in MailDepot
Summary
by MITRE • 10/06/2020
REDDOXX MailDepot 2032 2.2.1242 allows authenticated users to access the mailboxes of other users.
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Analysis
by VulDB Data Team • 11/16/2020
The vulnerability identified as CVE-2019-19200 affects REDDOXX MailDepot 2032 version 2.2.1242, representing a critical authorization flaw that undermines the security model of the email archiving system. This issue enables authenticated users to bypass normal access controls and gain unauthorized access to other users' mailboxes, fundamentally compromising the principle of least privilege that should govern email system access. The vulnerability resides within the application's permission handling mechanisms, where proper user isolation and mailbox access controls are inadequately implemented, allowing lateral movement between user accounts.
The technical exploitation of this vulnerability stems from insufficient input validation and access control checks within the application's authentication and authorization framework. When authenticated users interact with the MailDepot system, the application fails to properly verify that the requesting user has legitimate authorization to access the target mailbox. This flaw typically manifests through manipulated API calls or direct interface interactions where users can alter parameters to reference other users' mailboxes. The vulnerability can be classified under CWE-284 (Improper Access Control) and aligns with ATT&CK technique T1078 (Valid Accounts) as it leverages legitimate authenticated sessions to escalate privileges and access unauthorized data.
The operational impact of this vulnerability extends beyond simple data theft, as it enables comprehensive mailbox enumeration and data exfiltration capabilities for malicious actors. An attacker with valid credentials can systematically access multiple user mailboxes, potentially discovering sensitive communications, personal information, and business-critical data. This vulnerability particularly affects organizations that rely on email archiving for compliance and security purposes, as it undermines the very foundation of email security that these systems are designed to provide. The ability to access other users' mailboxes creates opportunities for social engineering attacks, data manipulation, and targeted information gathering that can severely compromise organizational security posture.
Organizations should implement immediate mitigations including enforcing strict access controls, implementing comprehensive logging and monitoring of mailbox access activities, and conducting thorough user access reviews to identify any unauthorized access patterns. The recommended approach involves updating to the latest version of REDDOXX MailDepot where this vulnerability has been patched, implementing network segmentation to limit access to the archiving system, and establishing automated monitoring for suspicious access patterns. Security teams should also consider implementing multi-factor authentication for administrative access and regular security assessments to identify similar authorization flaws in other enterprise systems. Additionally, the vulnerability highlights the importance of proper code review processes and security testing for authentication mechanisms to prevent similar issues in other applications.