CVE-2003-0613 in zblast
Summary
by MITRE
Buffer overflow in zblast-svgalib of zblast 1.2.1 and earlier allows local users to execute arbitrary code via the high score file.
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Analysis
by VulDB Data Team • 06/29/2021
The vulnerability described in CVE-2003-0613 represents a classic buffer overflow flaw within the zblast-svgalib component of the zblast 1.2.1 software suite and earlier versions. This issue specifically manifests when the application processes high score files, creating a scenario where malicious input can overwrite adjacent memory locations. The vulnerability is classified as a local privilege escalation vector, meaning that an attacker must already have access to the system to exploit it, though the potential for arbitrary code execution makes it particularly dangerous. The buffer overflow occurs due to inadequate input validation and bounds checking within the score file handling mechanism, allowing an attacker to craft a specially formatted high score file that exceeds the allocated buffer size.
The technical implementation of this vulnerability stems from improper memory management practices within the zblast application's score file parsing logic. When the application reads and processes high score data, it fails to properly validate the length of input data before copying it into fixed-size buffers. This allows attackers to overflow the buffer and potentially overwrite critical program memory segments including return addresses, function pointers, or other control data structures. The vulnerability directly maps to CWE-121, which describes heap-based buffer overflow conditions, and CWE-122, which covers stack-based buffer overflow scenarios. These classifications highlight the fundamental nature of the flaw as an improper restriction of operations within a memory buffer, a pattern that has been consistently identified as a critical security weakness across numerous software systems.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with a mechanism to gain unauthorized access to systems running vulnerable versions of zblast. Since the application likely runs with elevated privileges to maintain score files, successful exploitation could result in complete system compromise. The local nature of the attack means that an attacker needs to already have user-level access to the system, but this access point can serve as a foothold for further exploitation. From an attack framework perspective, this vulnerability aligns with techniques described in the MITRE ATT&CK framework under the T1068 category for "Exploitation for Privilege Escalation" and T1059 for "Command and Scripting Interpreter." The attack chain typically involves crafting a malicious high score file that triggers the buffer overflow, leading to arbitrary code execution, potentially escalating privileges to root or system-level access.
Mitigation strategies for CVE-2003-0613 focus on both immediate remediation and long-term architectural improvements. The primary recommendation involves upgrading to zblast versions that have addressed this vulnerability through proper input validation and buffer management techniques. Additionally, system administrators should implement proper access controls and file permissions to limit write access to high score files, reducing the attack surface. The implementation of stack canaries, address space layout randomization, and other exploit mitigation techniques can provide additional defense-in-depth measures. Organizations should also conduct regular security assessments to identify similar buffer overflow vulnerabilities in legacy systems, as this type of flaw was prevalent in software from the early 2000s era. The vulnerability serves as a historical example of why proper input validation and memory safety practices are fundamental to secure software development, particularly in applications that process external data from untrusted sources.