CVE-2004-0238 in 0verkill
Summary
by MITRE
Multiple buffer overflows in Overkill (0verkill) 0.15pre3 might allow local users to execute arbitrary code in the client via a long HOME environment variable in the (1) load_cfg and (2) save_cfg functions; possibly allow remote attackers to execute arbitrary code via long strings to (3) the send_message function; and, in the server, via (4) the parse_command_line function.
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Analysis
by VulDB Data Team • 12/02/2024
The vulnerability identified as CVE-2004-0238 affects Overkill version 0.15pre3, a network-based game client and server application that operates in a multiplayer environment. This vulnerability presents multiple attack vectors through buffer overflow conditions that can be exploited by both local and remote adversaries to execute arbitrary code within the target system. The primary concern stems from inadequate input validation and memory management practices in the application's core functions, creating opportunities for attackers to manipulate program execution flow through carefully crafted input data.
The technical flaw manifests in four distinct functions within the Overkill application where insufficient bounds checking allows attackers to overflow character buffers. The load_cfg and save_cfg functions are particularly vulnerable when processing the HOME environment variable, which can be manipulated by local users to overwrite adjacent memory locations. The send_message function presents a remote attack vector where long strings can trigger buffer overflows, while the parse_command_line function in the server component creates additional opportunities for remote code execution through command line argument manipulation. These buffer overflows occur due to the use of unsafe string handling functions that do not properly validate input length against allocated buffer sizes, directly violating fundamental security principles.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables full system compromise through local privilege escalation attacks when exploited locally and remote code execution when exploited remotely. Local users can leverage the HOME environment variable overflow to gain elevated privileges within the client context, while remote attackers can exploit the send_message and parse_command_line functions to execute malicious code on target systems. The implications are particularly severe given that Overkill operates in networked environments where multiple users interact, making the server component a prime target for exploitation. This vulnerability effectively undermines the integrity and confidentiality of the system, potentially allowing attackers to establish persistent access, exfiltrate data, or disrupt service availability.
Mitigation strategies for CVE-2004-0238 should focus on immediate patching of the affected Overkill version to address the buffer overflow conditions in all four identified functions. System administrators should implement environment variable restrictions to limit the length of HOME variables and other potentially dangerous environment parameters. Input validation measures should be strengthened throughout the application to prevent unbounded string operations, particularly in functions handling user-provided data. Network segmentation and firewall rules can help limit exposure of the server component to untrusted networks. Additionally, regular security audits and code reviews should be conducted to identify similar vulnerabilities in other applications, following established frameworks such as those defined in the CWE catalog for buffer overflow weaknesses and the ATT&CK framework's execution techniques for remote code execution. The vulnerability classification aligns with CWE-121, which addresses stack-based buffer overflow conditions, and represents a classic example of insecure coding practices that can be prevented through proper input validation and secure programming methodologies.