CVE-2007-4408 in ircu
Summary
by MITRE
ircu 2.10.12.05 and earlier ignores timestamps in bounces, which allows remote attackers to take over a channel during a netjoin by causing a bounce while a server with an older version of the channel is linking.
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Analysis
by VulDB Data Team • 09/07/2018
The vulnerability identified as CVE-2007-4408 affects ircu versions 2.10.12.05 and earlier, representing a critical flaw in the Internet Relay Chat protocol implementation that enables remote attackers to hijack channels during network synchronization events. This vulnerability specifically targets the handling of timestamp information within the bounce mechanism that occurs when servers establish connections during netjoin operations. The flaw stems from the software's failure to properly validate or utilize timestamp data when processing bounces, creating a window of opportunity for malicious actors to exploit the protocol's trust model.
The technical exploitation of this vulnerability occurs during the netjoin process when servers synchronize their channel information. When an older ircu server receives a bounce message from a newer server, it fails to properly validate the timestamp information contained within the message. This allows an attacker to craft malicious bounce messages with outdated or manipulated timestamps that can cause the vulnerable server to accept channel control from an unauthorized source. The vulnerability is particularly dangerous because it leverages the legitimate network synchronization process rather than requiring direct authentication or privilege escalation.
From an operational perspective, this vulnerability creates a significant risk during network maintenance or server reconnections when multiple ircu servers are establishing connections. The impact extends beyond simple channel takeover to potentially compromise the entire network's integrity, as successful exploitation can allow attackers to manipulate channel membership, control channel modes, and potentially gain access to sensitive communication channels. The vulnerability affects the fundamental trust model of IRC networks where servers are expected to validate the authenticity of channel information received from peers. This flaw directly violates the principle of secure communication channel establishment and can lead to persistent unauthorized access to channel resources.
The attack vector for CVE-2007-4408 aligns with the ATT&CK technique T1071.004 for application layer protocol manipulation and T1566 for credential harvesting through network protocols. The vulnerability maps to CWE-295 which addresses improper certificate validation, though in this case the validation failure occurs in timestamp handling rather than certificate validation. Network administrators face particular challenges in mitigating this vulnerability as it requires careful coordination of server updates across the entire network infrastructure. The remediation process involves upgrading all ircu servers to versions that properly handle timestamp validation during bounce processing, which may require network downtime during the update window. Organizations should implement network monitoring to detect unusual bounce patterns and consider implementing additional access controls and channel security measures as defensive measures while awaiting the upgrade process.
This vulnerability demonstrates the importance of proper timestamp validation in distributed systems and highlights the risks associated with legacy protocol implementations that may not adequately address security considerations in their design. The flaw represents a classic example of how seemingly minor implementation details in network protocols can create significant security weaknesses when multiple servers interact during synchronization events. The vulnerability also underscores the need for comprehensive security testing of network protocols, particularly during critical network operations such as server linking and channel synchronization. Organizations should implement regular vulnerability assessments of their IRC infrastructure and maintain updated security policies that address the specific risks associated with distributed chat protocols and their network synchronization mechanisms.