CVE-2017-5930 in PostfixAdmin
Summary
by MITRE
The AliasHandler component in PostfixAdmin before 3.0.2 allows remote authenticated domain admins to delete protected aliases via the delete parameter to delete.php, involving a missing permission check.
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Analysis
by VulDB Data Team • 04/24/2025
The vulnerability identified as CVE-2017-5930 resides within the AliasHandler component of PostfixAdmin version 3.0.1 and earlier, representing a critical authorization flaw that undermines the security model of email administration systems. This issue affects remote authenticated domain administrators who possess legitimate access credentials but should not have the ability to perform destructive operations on system-critical elements. The vulnerability manifests through the delete.php script which processes delete requests for aliases without implementing proper permission validation checks, creating a path for unauthorized alias deletion that violates fundamental security principles of access control.
The technical implementation of this flaw stems from insufficient input validation and authorization verification within the alias deletion workflow. When domain administrators submit deletion requests through the web interface, the system fails to verify whether the requesting user has sufficient privileges to remove the specific alias in question. This missing permission check creates a privilege escalation vector where authenticated users can manipulate the delete parameter to target protected aliases that should remain inaccessible to standard domain administrators. The vulnerability directly maps to CWE-285, which addresses insufficient authorization checks in software systems, and represents a classic case of inadequate access control implementation. The flaw operates at the application layer and can be exploited remotely, making it particularly dangerous as it does not require physical access to the system or elevated privileges beyond standard domain administrator credentials.
The operational impact of this vulnerability extends beyond simple data loss, potentially compromising email service availability and security posture for organizations relying on PostfixAdmin for their email infrastructure management. Domain administrators who can delete protected aliases may inadvertently or maliciously disrupt email services, compromise email routing configurations, or gain unauthorized access to sensitive communication channels. This vulnerability can be leveraged to undermine the integrity of email systems by removing aliases that serve critical business functions or security monitoring purposes. The attack surface is particularly concerning for organizations with multiple domain administrators, as the vulnerability allows for targeted attacks against specific alias configurations without requiring additional authentication mechanisms or elevated privileges.
Organizations affected by this vulnerability should implement immediate mitigations including upgrading to PostfixAdmin version 3.0.2 or later, which contains the necessary permission checks to prevent unauthorized alias deletion. Additionally, administrators should review and enforce proper access control policies, ensuring that domain administrators have the minimum necessary privileges for their roles. The implementation of additional logging mechanisms around alias deletion operations can provide visibility into unauthorized attempts to modify protected configurations. Security teams should also consider implementing network segmentation and monitoring solutions to detect unusual deletion patterns that may indicate exploitation attempts. This vulnerability highlights the importance of following security best practices such as principle of least privilege, input validation, and regular security updates, with references to ATT&CK technique T1078 for legitimate credentials and T1485 for data destruction, emphasizing the need for comprehensive security controls beyond simple patch management.