CVE-2006-4620 in WebAdmin
Summary
by MITRE
The useredit_account.wdm module in Alt-N WebAdmin 3.2.5 running with MDaemon 9.0.6, and possibly earlier versions, allows remote authenticated domain administrators to gain privileges and obtain access to the system mail queue by modifying the mailbox of the MDaemon user account to use the mailbox of another account.
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Analysis
by VulDB Data Team • 06/25/2019
The vulnerability identified as CVE-2006-4620 represents a critical privilege escalation flaw within the Alt-N WebAdmin 3.2.5 component when integrated with MDaemon 9.0.6 email server software. This security weakness specifically targets domain administrators who possess authenticated access to the system, creating a pathway for unauthorized privilege elevation and system compromise. The vulnerability operates through a manipulation of user account configurations within the web administration interface, allowing malicious actors to exploit the system's trust model and gain elevated access rights.
The technical implementation of this vulnerability stems from insufficient input validation and access control mechanisms within the useredit_account.wdm module. When domain administrators attempt to modify user mailbox configurations, the system fails to properly validate the legitimacy of the target mailbox modifications. This validation gap enables attackers to redirect the mailbox association of the MDaemon user account to point toward another existing account, effectively creating a backdoor access mechanism. The flaw essentially allows an authenticated user to manipulate account mappings in a way that bypasses normal authorization checks and grants access to system resources that should remain restricted.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with access to the system mail queue, a critical component that contains all email messages processed by the mail server. This access enables comprehensive surveillance of all email communications passing through the affected system, potentially exposing sensitive data, credentials, and confidential communications. The vulnerability affects not only individual accounts but can compromise the entire email infrastructure, as the mail queue access allows for message interception, modification, and potential exfiltration of data. This represents a significant threat to email security and data confidentiality within the affected organization.
From a cybersecurity framework perspective, this vulnerability maps directly to CWE-264, which addresses permissions, privileges, and access control issues, and aligns with ATT&CK technique T1078 for valid accounts and T1566 for credential access. The flaw demonstrates a classic case of insufficient privilege separation where domain administrators are granted excessive control over user account configurations without proper validation checks. Organizations should implement immediate mitigations including patching to the latest available versions of both MDaemon and Alt-N WebAdmin, implementing role-based access controls that limit domain administrator privileges, and establishing network segmentation to restrict access to administrative interfaces. Additionally, monitoring for unauthorized mailbox modifications and implementing automated alerting for suspicious account configuration changes would significantly reduce the risk of exploitation. The vulnerability underscores the importance of proper access control design and the principle of least privilege in email server configurations.