CVE-2008-2503 in eMule X-Ray
Summary
by MITRE
Buffer overflow in Uploadlist in eMule X-Ray before 1.4 has unknown impact and remote attack vectors.
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Analysis
by VulDB Data Team • 11/17/2017
The vulnerability identified as CVE-2008-2503 represents a critical buffer overflow condition within the Uploadlist component of eMule X-Ray software versions prior to 1.4. This flaw exists in the file upload handling functionality of the eMule client extension, which is designed to enhance file sharing capabilities within the eMule network ecosystem. The buffer overflow occurs when the software processes incoming data during file upload operations, specifically within the Uploadlist module that manages the list of files being uploaded to other peers in the network. The vulnerability is particularly concerning because it affects a core component of the software's file sharing infrastructure, which is essential for normal operation within the eMule peer-to-peer network.
The technical implementation of this buffer overflow stems from inadequate input validation and memory management within the Uploadlist functionality. When eMule X-Ray processes file upload requests, it fails to properly bounds-check the size of incoming data buffers, allowing maliciously crafted input to overwrite adjacent memory locations. This memory corruption can occur during the processing of file metadata or upload status information, where the software allocates a fixed-size buffer without sufficient validation of the actual data size being received. The flaw is classified as a classic stack-based buffer overflow according to CWE-121, which occurs when insufficient space is allocated for data that exceeds the buffer boundaries. The vulnerability enables attackers to potentially execute arbitrary code on the target system or cause denial of service conditions.
The operational impact of this vulnerability extends beyond simple system instability, as it creates multiple attack vectors for remote exploitation within the eMule network environment. Attackers can leverage this vulnerability through malicious file sharing activities, potentially injecting malicious code into the upload process of legitimate eMule clients. The remote attack capability means that malicious actors do not need physical access to the target system but can exploit the vulnerability through network-based interactions with the vulnerable eMule X-Ray client. This aligns with ATT&CK technique T1190, which describes the exploitation of vulnerabilities in software to gain remote access. The vulnerability affects the integrity and availability of the eMule network infrastructure, potentially allowing attackers to compromise entire client systems or disrupt the file sharing operations within the network.
Mitigation strategies for CVE-2008-2503 require immediate software updates to version 1.4 or later, which contain fixed implementations of the Uploadlist module with proper memory bounds checking. Network administrators should implement firewall rules to restrict eMule traffic where possible, though this is not a complete solution given the nature of peer-to-peer file sharing networks. The vulnerability highlights the importance of input validation and memory safety practices in networked applications, particularly those handling user-provided data within peer-to-peer environments. Organizations should also consider implementing network monitoring solutions to detect anomalous file sharing patterns that might indicate exploitation attempts. Additionally, users should be educated about the risks of downloading and sharing files from untrusted sources, as the vulnerability can be exploited through malicious file uploads within the eMule ecosystem. The incident underscores the necessity of regular security updates and proper software maintenance practices to protect against known vulnerabilities in widely-used peer-to-peer applications.