CVE-2002-0125 in ClanLib
Summary
by MITRE
Buffer overflow in ClanLib library 0.5 may allow local users to execute arbitrary code in games that use the library, such as (1) Super Methane Brothers, (2) Star War, (3) Kwirk, (4) Clankanoid, and others, via a long HOME environment variable.
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Analysis
by VulDB Data Team • 06/06/2018
The vulnerability identified as CVE-2002-0125 represents a critical buffer overflow flaw within the ClanLib library version 0.5 that poses significant security risks to numerous games utilizing this software component. This issue specifically affects applications that rely on the library for their graphical and multimedia functionality, creating a potential attack vector that could be exploited by local users to gain unauthorized code execution privileges. The affected games include Super Methane Brothers, Star War, Kwirk, Clankanoid, and various other titles that incorporate ClanLib into their runtime environments. The vulnerability stems from inadequate input validation mechanisms within the library's handling of environment variables, particularly the HOME variable which is commonly used by Unix-like systems to determine user home directories.
The technical implementation of this buffer overflow occurs when the ClanLib library processes the HOME environment variable without proper bounds checking or length validation. When a local user sets an excessively long HOME environment variable, the library's internal buffer allocation fails to accommodate the oversized input, leading to memory corruption that can be exploited to overwrite adjacent memory locations. This memory corruption typically manifests through stack smashing or heap corruption techniques that allow attackers to manipulate program execution flow. The vulnerability specifically aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory, and CWE-122, which addresses heap-based buffer overflows that occur when insufficient bounds checking allows data to be written beyond the allocated buffer boundaries. The exploitation of this vulnerability falls under the ATT&CK technique T1059.001 for command and scripting interpreter, as successful exploitation could enable attackers to execute arbitrary code within the context of the affected applications.
The operational impact of CVE-2002-0125 extends beyond simple privilege escalation, as it fundamentally compromises the integrity and security of gaming applications that depend on ClanLib. Local users who exploit this vulnerability can potentially execute malicious code with the privileges of the affected game processes, which may include elevated system permissions depending on how the games are configured. The attack surface is particularly concerning because many of these games are commonly installed on systems where users may have local access, making the exploitation relatively straightforward. The vulnerability affects not only the specific games mentioned but also any other applications that utilize ClanLib 0.5, creating a widespread security concern across the gaming ecosystem that relied on this particular library version. Additionally, the nature of buffer overflows in gaming applications presents unique challenges since these programs often handle complex multimedia data processing that can mask the effects of memory corruption until exploited.
Mitigation strategies for CVE-2002-0125 require immediate attention through software updates and system hardening measures. The primary solution involves upgrading to a patched version of ClanLib that addresses the buffer overflow vulnerability through proper input validation and bounds checking mechanisms. System administrators should implement environment variable length restrictions to prevent overly long HOME variables from being processed by affected applications. Additionally, implementing address space layout randomization and stack canaries can provide additional protection layers against exploitation attempts. The vulnerability also highlights the importance of secure coding practices and thorough input validation, particularly for libraries that serve as foundational components for multiple applications. Organizations should conduct comprehensive vulnerability assessments to identify all systems running affected games and ensure that proper security controls are in place to prevent exploitation of this and similar buffer overflow vulnerabilities. Regular security updates and patch management processes become critical in preventing such vulnerabilities from being exploited in real-world scenarios where local user access may be available.