CVE-2003-0454 in xgalaga
Summary
by MITRE
Multiple buffer overflows in xgalaga 2.0.34 and earlier allow local users to gain privileges via a long HOME environment variable.
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Analysis
by VulDB Data Team • 11/26/2024
The vulnerability identified as CVE-2003-0454 represents a critical buffer overflow flaw affecting the xgalaga game client version 2.0.34 and earlier. This issue resides within the environment variable handling mechanism of the application, specifically when processing the HOME environment variable. The flaw occurs due to insufficient bounds checking during the parsing of user-supplied environment variables, creating a condition where an attacker can manipulate the application's memory layout through crafted input.
The technical implementation of this vulnerability stems from improper memory management within the xgalaga application's initialization sequence. When the program starts, it reads the HOME environment variable to determine user-specific configuration paths and data locations. However, the code fails to validate the length of this variable before copying it into a fixed-size buffer. This classic buffer overflow condition allows an attacker to overwrite adjacent memory locations, potentially including return addresses, stack canaries, or other critical program data structures. The vulnerability is classified as local privilege escalation since it requires the target user to execute the vulnerable application, but successful exploitation can result in elevated privileges.
The operational impact of CVE-2003-0454 extends beyond simple local privilege escalation to encompass potential system compromise and persistent access. An attacker who successfully exploits this vulnerability can execute arbitrary code with the privileges of the user running xgalaga, which may include administrative rights on the system. This vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and demonstrates how environment variable handling can create exploitable memory corruption scenarios. The attack vector is particularly concerning as it leverages standard system environment variables that are typically present in all user sessions, making the vulnerability accessible without requiring special conditions or privileges.
Security practitioners should note that this vulnerability exemplifies the importance of input validation and proper memory management in application development. The exploitation process typically involves crafting a specially formatted HOME environment variable that exceeds the buffer capacity, causing the overflow to overwrite critical program execution flow. Mitigation strategies include applying the vendor-provided patch that increases buffer sizes and implements proper bounds checking, as well as implementing runtime protections such as stack canaries, address space layout randomization, and non-executable stack protections. Organizations should also consider implementing environment variable restrictions in system configurations to prevent overly long values from being processed by vulnerable applications. This vulnerability demonstrates how seemingly benign environment variable processing can create significant security risks, reinforcing the need for comprehensive security testing and code review practices that address all input processing pathways within applications.
The broader implications of this vulnerability extend to understanding how legacy applications may contain unpatched security flaws that persist across multiple system deployments. This particular issue highlights the importance of maintaining current software versions and implementing robust software inventory management processes. The vulnerability also serves as a case study in how privilege escalation vulnerabilities can be exploited to gain persistent access to systems, making it a key consideration for incident response and forensic analysis. Organizations should conduct vulnerability assessments to identify other applications with similar buffer overflow conditions, particularly those that process environment variables or user input without proper validation. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically focusing on the use of environment variables for exploitation. Proper remediation requires not only patching the specific vulnerability but also implementing security controls that prevent similar issues from occurring in other applications within the system landscape.