CVE-2004-2711 in Gyach Enhanced
Summary
by MITRE
Multiple buffer overflows in Gyach Enhanced (Gyach-E) before 1.0.2 allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via vectors related to "avatar retrieval."
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Analysis
by VulDB Data Team • 03/26/2019
The vulnerability identified as CVE-2004-2711 affects Gyach Enhanced (Gyach-E) versions prior to 1.0.2, representing a critical security flaw that exposes the application to remote exploitation. This issue manifests through multiple buffer overflow conditions specifically within the avatar retrieval functionality, which serves as a primary attack vector for malicious actors seeking to compromise systems running vulnerable versions of the software. The vulnerability's classification as a buffer overflow aligns with CWE-121, which describes heap-based buffer overflow conditions that occur when a program writes data beyond the boundaries of a buffer allocated on the heap, and CWE-122, which covers stack-based buffer overflows where data exceeds allocated stack space.
The technical implementation of this vulnerability stems from inadequate input validation and memory management within the avatar retrieval module of Gyach-E. When the application processes avatar data from remote sources, it fails to properly bounds-check the incoming data before copying it into fixed-size buffers. This allows attackers to craft specially malformed avatar data that exceeds buffer capacity, resulting in memory corruption that can be exploited to redirect program execution flow. The flaw operates at the application layer, requiring no special privileges for exploitation and making it particularly dangerous in environments where users might unknowingly interact with malicious content.
The operational impact of CVE-2004-2711 extends beyond simple denial of service conditions, as the buffer overflow vulnerabilities create opportunities for remote code execution. When exploited successfully, these conditions can allow attackers to execute arbitrary code with the privileges of the affected application, potentially leading to complete system compromise. The vulnerability's remote nature means that attackers can exploit it without requiring physical access to target systems, making it particularly attractive for widespread exploitation campaigns. The denial of service aspect manifests as application crashes and service unavailability, which can disrupt legitimate user activities and potentially create conditions for further exploitation.
Mitigation strategies for this vulnerability require immediate patching of affected Gyach-E installations to version 1.0.2 or later, which includes proper input validation and buffer management fixes. System administrators should implement network segmentation and access controls to limit exposure of vulnerable systems, while also monitoring for exploitation attempts through network traffic analysis and intrusion detection systems. The vulnerability demonstrates the importance of input validation practices and proper memory management in preventing buffer overflow exploits, aligning with ATT&CK technique T1203 for legitimate program execution and T1059 for command and scripting interpreter usage. Organizations should also consider implementing application whitelisting policies to prevent execution of untrusted code and maintain regular vulnerability assessments to identify similar issues in other applications. The remediation process should include comprehensive testing to ensure that patches do not introduce compatibility issues while also validating that proper input sanitization mechanisms are in place to prevent similar vulnerabilities from emerging in future development cycles.