CVE-2008-1033 in CUPS
Summary
by MITRE
The scheduler in CUPS in Apple Mac OS X 10.5 before 10.5.3, when debug logging is enabled and a printer requires a password, allows attackers to obtain sensitive information (credentials) by reading the log data, related to "authentication environment variables."
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Analysis
by VulDB Data Team • 06/29/2025
The vulnerability identified as CVE-2008-1033 represents a critical information disclosure flaw within the Common Unix Printing System CUPS implementation on Apple Mac OS X platforms. This issue specifically affects versions prior to 10.5.3 and stems from improper handling of authentication credentials when debug logging is enabled. The flaw occurs within the scheduler component of CUPS, which is responsible for managing print job scheduling and processing. When a printer requires authentication and debug logging is active, the system inadvertently exposes sensitive credential information through log files, creating a significant security risk for affected systems.
The technical mechanism behind this vulnerability involves the improper management of environment variables during the authentication process. When CUPS encounters a printer that requires password authentication, it stores authentication credentials in environment variables that are then written to debug log files. This occurs because the logging mechanism does not properly sanitize or filter these variables before writing them to persistent storage. The vulnerability is particularly concerning because it allows attackers to directly read sensitive information from log files, potentially gaining access to printer authentication credentials that could be used to gain unauthorized access to networked printing resources. This behavior aligns with CWE-200, which addresses improper information exposure, and represents a classic case of insecure logging practices where sensitive data is written to files without adequate protection mechanisms.
The operational impact of this vulnerability extends beyond simple credential theft, as it can enable attackers to escalate their privileges and gain unauthorized access to networked printing infrastructure. An attacker with access to the system logs could extract printer credentials and potentially use them to submit print jobs, modify printer configurations, or even access other network resources that share the same authentication mechanisms. This vulnerability particularly affects environments where multiple users share printing resources and where debug logging is enabled for troubleshooting purposes. The risk is compounded by the fact that log files are often stored in locations accessible to local users or may be transmitted to centralized logging systems, potentially exposing the credentials to additional attack vectors. The ATT&CK framework categorizes this as a credential access technique, specifically leveraging the use of log data as a vector for information extraction.
Mitigation strategies for CVE-2008-1033 focus primarily on disabling debug logging in production environments and ensuring that authentication credentials are properly sanitized before being written to log files. System administrators should immediately update to Mac OS X 10.5.3 or later versions where this vulnerability has been patched. Additionally, organizations should implement proper log management practices that include regular log file reviews, access controls to prevent unauthorized log file access, and the implementation of log sanitization processes that remove sensitive information from log entries. The patch for this vulnerability specifically addresses the improper handling of environment variables during authentication by ensuring that authentication credentials are not written to debug logs when they are not required for troubleshooting purposes. Organizations should also consider implementing network segmentation and access controls around printing infrastructure to limit the potential impact of credential exposure, while maintaining proper audit trails for legitimate troubleshooting activities.