CVE-2004-1269 in CUPS
Summary
by MITRE
lppasswd in CUPS 1.1.22 does not remove the passwd.new file if it encounters a file-size resource limit while writing to passwd.new, which causes subsequent invocations of lppasswd to fail.
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Analysis
by VulDB Data Team • 07/13/2025
The vulnerability described in CVE-2004-1269 represents a resource management flaw within the Common Unix Printing System CUPS version 1.1.22 specifically affecting the lppasswd utility. This issue manifests when the system encounters file-size resource limits during the password file update process, creating a persistent state where temporary files remain undeleted. The lppasswd utility is responsible for managing printer authentication credentials within CUPS, making it a critical component for printer access control and system security. When the utility fails to clean up temporary files after encountering resource constraints, it creates a denial of service condition that affects legitimate administrative operations.
The technical root cause of this vulnerability lies in improper error handling within the file writing process of lppasswd. When the system reaches its file-size resource limit while attempting to write to the passwd.new temporary file, the utility does not implement proper cleanup routines to remove this temporary file. This behavior violates fundamental resource management principles and creates a state where subsequent invocations of lppasswd cannot proceed normally. The vulnerability is categorized under CWE-772, which addresses Missing Cleanup, specifically focusing on the failure to remove temporary files after operations fail. The flaw represents a classic case of resource leak where temporary system artifacts are not properly disposed of, leading to operational degradation.
From an operational impact perspective, this vulnerability creates a persistent denial of service condition that affects printer administration capabilities within CUPS-managed environments. System administrators attempting to update printer passwords or manage user access permissions would encounter failures when lppasswd cannot create new password files due to the lingering temporary file. This issue particularly affects environments where printer access control is critical and where administrators must regularly update authentication credentials. The vulnerability can compound security risks by preventing legitimate administrative actions, potentially forcing reliance on alternative, less secure methods for printer access management. According to ATT&CK framework, this vulnerability maps to T1547.009 which covers Domain Policy Modification and T1078.002 which involves Valid Accounts, as it impacts the legitimate use of printer authentication mechanisms.
The mitigation strategies for CVE-2004-1269 focus primarily on upgrading to patched versions of CUPS where proper resource cleanup mechanisms have been implemented. System administrators should ensure that all CUPS installations are updated to versions that address this specific file cleanup behavior. Additionally, implementing proper monitoring of file system resource usage can help detect when such resource limits are being approached, allowing for proactive management of system resources. The vulnerability demonstrates the importance of implementing robust error handling and cleanup routines in system utilities, particularly those handling authentication and access control functions. Organizations should also consider implementing automated backup and recovery procedures for printer authentication files to ensure continued operational capability even when such resource management issues occur. Regular security assessments should include verification of temporary file cleanup behaviors in critical system utilities to prevent similar vulnerabilities from persisting in production environments.