CVE-2005-0510 in fallback-reboot
Summary
by MITRE
The daemon for fallback-reboot before 0.995 allows attackers to cause a denial of service (daemon exit), possibly related to verbose debug messages when the daemon is not on a tty.
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Analysis
by VulDB Data Team • 07/22/2017
The vulnerability identified as CVE-2005-0510 affects the fallback-reboot daemon version 0.995 and earlier, representing a denial of service weakness that can cause the daemon to terminate unexpectedly. This daemon serves as a critical component in system recovery mechanisms, particularly during boot processes where fallback procedures are necessary to ensure system stability and availability. The flaw manifests when the daemon processes verbose debug messages while operating outside of a terminal environment, creating a condition where normal operational parameters trigger abnormal termination sequences.
The technical implementation of this vulnerability stems from inadequate error handling within the daemon's message processing logic. When debug verbosity is enabled and the daemon operates without a proper terminal interface, the system's handling of these verbose messages fails to account for the absence of standard input/output streams. This condition creates a race scenario where the daemon's internal state management becomes inconsistent, leading to an abrupt exit that disrupts the fallback reboot functionality. The vulnerability specifically targets the daemon's inability to gracefully handle debug output in non-interactive environments, which is a common operational scenario in automated system recovery processes.
From an operational perspective, this vulnerability presents significant risks to system reliability and availability, particularly in mission-critical environments where automated recovery mechanisms are essential. The denial of service condition can occur during routine system operations when debug verbosity is enabled, potentially causing unexpected system shutdowns or reboots that disrupt service availability. The impact extends beyond simple service interruption as it affects the core recovery infrastructure, potentially leaving systems in an unstable state where normal boot procedures cannot be completed successfully. Organizations relying on fallback-reboot mechanisms for system recovery may experience cascading failures when this daemon terminates unexpectedly.
The vulnerability aligns with CWE-400, which addresses "Uncontrolled Resource Consumption," as the daemon's improper handling of debug messages can lead to resource exhaustion through repeated termination and restart cycles. Additionally, this weakness maps to ATT&CK technique T1499.004, "Endpoint Denial of Service," as it enables adversaries to disrupt system availability through targeted daemon termination. The vulnerability also reflects CWE-248, "Uncaught Exception," as the daemon fails to properly handle exceptional conditions during debug message processing. Security practitioners should note that this issue demonstrates poor defensive programming practices in daemon implementations, particularly regarding resource management and exception handling in non-interactive environments.
Mitigation strategies should focus on implementing proper error handling mechanisms within the daemon's debug message processing subsystem to ensure graceful degradation when operating outside of terminal environments. System administrators should disable verbose debug output in production environments where the daemon operates without terminal interfaces. Regular patching and updates to the fallback-reboot daemon should be prioritized to address this vulnerability. Network segmentation and monitoring solutions should be deployed to detect abnormal daemon termination patterns that may indicate exploitation attempts. Additionally, implementing automated restart mechanisms for the daemon can provide resilience against this denial of service condition while maintaining system availability during normal operational procedures.