CVE-2004-0708 in MoinMoin
Summary
by MITRE
MoinMoin 1.2.1 and earlier allows remote attackers to gain privileges by creating a user with the same name as an existing group that has higher privileges.
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Analysis
by VulDB Data Team • 07/22/2019
The vulnerability described in CVE-2004-0708 represents a critical access control flaw within MoinMoin version 1.2.1 and earlier systems. This issue stems from a fundamental design weakness in the user and group management subsystem where the application fails to properly validate user creation requests against existing group names. The flaw creates a scenario where malicious actors can exploit the naming conflict between users and groups to escalate their privileges, effectively bypassing the intended security boundaries that separate regular users from privileged administrators.
The technical implementation of this vulnerability occurs when an attacker creates a new user account using a username that matches the name of an existing group with elevated permissions. In systems where groups define access rights and privileges, this naming collision allows the newly created user to inherit or assume the privileges associated with the group rather than maintaining the standard user permissions. The vulnerability specifically manifests in the authentication and authorization logic that does not adequately distinguish between user accounts and group identifiers during the account creation process. This type of flaw falls under the category of privilege escalation attacks and can be categorized as a CWE-285: Improper Authorization, which directly addresses insufficient checks on access control mechanisms.
The operational impact of this vulnerability extends beyond simple privilege escalation to potentially compromise entire wiki systems and their underlying data. When an attacker successfully exploits this flaw, they can gain access to administrative functions, modify content, delete pages, and potentially access sensitive information that should be restricted to authorized personnel only. The attack vector is particularly concerning as it requires minimal technical expertise to execute, making it a significant threat to organizations relying on MoinMoin for collaborative documentation and knowledge management. This vulnerability aligns with ATT&CK technique T1078.004: Valid Accounts, where attackers leverage legitimate accounts to gain access to restricted resources, though in this case the attacker effectively creates a malicious account that inherits privileged status.
Organizations using affected MoinMoin versions should implement immediate mitigations including upgrading to patched versions, implementing proper name validation during user creation, and establishing strict access controls for account management functions. The fix typically involves modifying the application's user creation logic to prevent naming conflicts between users and groups, ensuring that group names cannot be used as usernames or vice versa. Additionally, system administrators should conduct thorough audits of existing user accounts to identify any potential compromised accounts and implement monitoring for suspicious account creation activities. The vulnerability demonstrates the importance of proper input validation and access control enforcement in web applications, particularly those handling user management and privilege assignment functions.