CVE-2003-0451 in xbl
Summary
by MITRE
Multiple buffer overflows in xbl before 1.0k allow local users to gain privileges via certain long command line arguments.
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Analysis
by VulDB Data Team • 06/28/2021
The vulnerability identified as CVE-2003-0451 represents a critical security flaw in the xbl software before version 1.0k that exposes systems to local privilege escalation attacks. This issue stems from improper input validation mechanisms within the command line argument processing functionality of the xbl application. The vulnerability manifests when local users provide excessively long command line arguments that exceed the allocated buffer space, leading to memory corruption that can be exploited to execute arbitrary code with elevated privileges. The flaw directly impacts the software's ability to handle user input safely, creating a pathway for malicious local actors to bypass security controls and gain unauthorized access to system resources.
The technical implementation of this vulnerability aligns with common buffer overflow patterns that fall under CWE-121, which describes unsafe array access conditions where insufficient bounds checking allows memory corruption. The xbl application fails to properly validate the length of command line arguments before processing them, creating a classic stack-based buffer overflow scenario. When the application encounters command line parameters exceeding the predefined buffer limits, the excess data overflows into adjacent memory locations, potentially overwriting critical program state information including return addresses and function pointers. This memory corruption can be systematically exploited to redirect program execution flow and execute malicious code with the privileges of the target process, typically escalating from standard user to root or administrator level access.
From an operational perspective, this vulnerability presents a significant risk to system security as it requires minimal attack vector access from a local user account. The exploitation process involves crafting specific command line arguments that trigger the buffer overflow condition, making it particularly dangerous in environments where local users have access to the system. The impact extends beyond simple privilege escalation, as successful exploitation can lead to complete system compromise, data exfiltration, and persistent backdoor installation. Organizations running affected versions of xbl software are particularly vulnerable during system maintenance periods or when local user accounts are not properly secured, creating opportunities for both malicious insiders and external attackers who have gained local access to exploit this weakness.
Mitigation strategies for CVE-2003-0451 should prioritize immediate software updates to version 1.0k or later, which contains proper input validation and buffer management fixes. System administrators should implement comprehensive input sanitization measures at the application level, including strict command line argument length limits and robust boundary checking mechanisms. Network segmentation and access control policies should be enforced to limit local user privileges and reduce the attack surface available for exploitation. Additionally, regular security audits should verify that all system components properly validate input parameters and implement appropriate memory safety measures. The vulnerability demonstrates the critical importance of input validation and buffer management in software development practices, aligning with ATT&CK technique T1068 which covers privilege escalation through local exploits, and emphasizing the need for secure coding practices that prevent memory corruption vulnerabilities from being introduced into software systems.