CVE-2002-0389 in Mailman
Summary
by MITRE
Pipermail in Mailman stores private mail messages with predictable filenames in a world-executable directory, which allows local users to read private mailing list archives.
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Analysis
by VulDB Data Team • 06/27/2021
The vulnerability described in CVE-2002-0389 affects the Pipermail component of the Mailman mailing list management system, which is widely used for managing email discussions and archives. This issue stems from improper file system permissions and predictable naming conventions that create a significant security weakness in the archive storage mechanism. The vulnerability specifically impacts systems where Mailman is configured with world-executable permissions on the directory containing mailing list archives, allowing unauthorized local users to access private message content that should remain confidential.
The technical flaw manifests in the predictable filename generation mechanism used by Pipermail when storing archived messages. When Mailman processes and stores email messages in its archive directories, it creates files with easily guessable names based on predictable patterns such as message numbers, timestamps, or sequential identifiers. Combined with the world-executable permissions on the archive directory, this creates a scenario where any local user can enumerate and access these files through direct file system access or web server requests. The vulnerability is particularly dangerous because it allows attackers to bypass normal access controls and read private mailing list communications that may contain sensitive information, confidential business discussions, or personal data shared within the mailing list community.
This vulnerability operates at the intersection of multiple security principles and can be analyzed through the lens of CWE-22, which describes improper limitation of a pathname to a restricted directory, and CWE-73, which addresses external control of filename or path. The operational impact extends beyond simple information disclosure as it can compromise the integrity of communication channels within organizations, potentially exposing trade secrets, personal information, or strategic discussions. The attack vector is particularly concerning because it requires minimal privileges and can be executed by any local user with access to the system, making it a persistent threat that can be exploited by both malicious insiders and external attackers who gain local access. The vulnerability also aligns with ATT&CK technique T1005, which covers data from local system, and T1083, which involves file and directory discovery, as attackers can systematically enumerate and access archived content.
Mitigation strategies for this vulnerability must address both the immediate file system permission issues and the underlying predictable filename generation. System administrators should immediately review and correct directory permissions to ensure that archive directories are not world-executable and that appropriate access controls are enforced. The recommended approach involves implementing proper file system permissions where only authorized users and processes can access the archive directories, typically through group-based access controls or more restrictive permission sets. Additionally, the Mailman configuration should be reviewed to ensure that filename generation uses non-predictable patterns and that the system implements proper access logging to detect unauthorized access attempts. Organizations should also consider implementing monitoring solutions to track access to sensitive archive directories and establish regular security audits to verify that proper permissions are maintained. The vulnerability highlights the importance of principle of least privilege and proper access control implementation, as well as the need for regular security assessments of critical system components that handle sensitive data.