CVE-2007-4100 in MLDonkey
Summary
by MITRE
MLDonkey before 2.9.0 does not load certain code from $MLDONKEY/web_infos/ before the network modules become active, which allows remote attackers to bypass the IP blocklist.
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Analysis
by VulDB Data Team • 09/06/2018
The vulnerability identified as CVE-2007-4100 affects MLDonkey versions prior to 2.9.0, representing a significant security flaw in peer-to-peer file sharing software that operates within distributed networks. This issue stems from the improper initialization sequence of the software's components, specifically concerning how the system handles code loading during the startup process. The vulnerability manifests when the network modules activate before certain critical code from the $MLDONKEY/web_infos/ directory has been properly loaded into memory. This temporal mismatch creates a window of opportunity for malicious actors to exploit the system's security controls.
The technical root cause of this vulnerability lies in the software's initialization logic and resource management approach. During the startup sequence, MLDonkey fails to ensure that all necessary security components are fully initialized before network functionality becomes active. The $MLDONKEY/web_infos/ directory contains essential code that would normally enforce IP address restrictions and maintain the blocklist functionality. When this code remains unloaded during the critical network activation phase, the system operates without proper IP filtering mechanisms in place, allowing unauthorized connections from addresses that should have been blocked.
This vulnerability directly impacts the operational security posture of MLDonkey users and administrators by creating a persistent bypass mechanism for IP-based access controls. Remote attackers can exploit this flaw to establish connections from blocked IP addresses, effectively circumventing the intended network security policies. The impact extends beyond simple connectivity issues as it undermines the fundamental security model of the software, potentially allowing malicious actors to gain unauthorized access to the network, conduct unauthorized file sharing activities, or launch further attacks through the compromised system.
The vulnerability aligns with CWE-691, which addresses insufficient initialization of security-critical components, and demonstrates characteristics consistent with improper initialization patterns that can lead to security bypasses. From an operational perspective, this issue represents a critical flaw in the software's security architecture and highlights the importance of proper component initialization sequences. The ATT&CK framework categorizes this vulnerability under privilege escalation and defense evasion techniques, as it allows attackers to bypass security controls that should prevent unauthorized access to the system.
Mitigation strategies for CVE-2007-4100 require immediate software updates to version 2.9.0 or later, where the initialization sequence has been corrected to ensure proper loading of security components before network activation. System administrators should also implement additional monitoring controls to detect unusual network activity patterns that might indicate exploitation attempts. Network-level protections such as firewall rules and intrusion detection systems can provide additional layers of defense, though the primary fix must address the underlying initialization flaw. Regular security audits of software startup processes and component loading sequences should be conducted to identify similar vulnerabilities in other systems. The vulnerability underscores the critical importance of proper software lifecycle management and the necessity of thorough testing of initialization sequences in security-critical applications.