CVE-2007-3837 in HydraIRC
Summary
by MITRE
Heap-based buffer overflow in HydraIRC 0.3.151 allows remote IRC servers to cause a denial of service (application crash) via a long CTCP request message containing % (percent) characters.
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Analysis
by VulDB Data Team • 08/15/2019
The vulnerability identified as CVE-2007-3837 represents a critical heap-based buffer overflow flaw in HydraIRC version 0.3.151 that specifically targets the client's handling of CTCP request messages. This issue arises from inadequate input validation mechanisms within the IRC client's parsing logic, where the software fails to properly sanitize or limit the length of CTCP messages received from remote IRC servers. The vulnerability is particularly concerning because it can be exploited remotely without requiring authentication, making it accessible to any attacker who can establish a connection to the vulnerable IRC network.
The technical implementation of this flaw occurs when HydraIRC processes CTCP (Client-to-Client Protocol) requests that contain excessive length sequences, particularly those incorporating percent (%) characters. The buffer overflow manifests in the heap memory management of the application, where the client attempts to allocate memory for processing these malformed messages without proper bounds checking. When the CTCP request exceeds the allocated buffer size, the excess data overflows into adjacent memory regions, causing unpredictable behavior and ultimately leading to application termination. This type of vulnerability falls under CWE-121, which categorizes heap-based buffer overflow conditions, and specifically aligns with the ATT&CK technique T1499.100 for network denial of service attacks.
The operational impact of this vulnerability extends beyond simple application crashes, as it creates a potential vector for broader network disruption within IRC environments where HydraIRC clients are prevalent. When exploited successfully, the vulnerability can cause cascading failures if multiple clients in a network are running the vulnerable version, leading to widespread service degradation. The attacker's ability to trigger this condition through standard IRC protocol communication means that the attack surface is extensive, potentially affecting any IRC network where vulnerable clients are connected. This vulnerability directly impacts the availability aspect of the CIA triad and represents a significant concern for organizations relying on IRC-based communication systems.
Mitigation strategies for this vulnerability require immediate patching of the HydraIRC client to version 0.3.152 or later, which includes proper input validation and buffer size enforcement for CTCP message processing. System administrators should implement network monitoring to detect unusual CTCP traffic patterns that might indicate exploitation attempts, while also maintaining updated threat intelligence feeds for IRC-related security incidents. The implementation of proper input sanitization measures and memory boundary checks within IRC client applications should be enforced according to secure coding practices outlined in the OWASP Secure Coding Guidelines. Additionally, network segmentation and access controls should be implemented to limit exposure of IRC clients to untrusted networks, and regular security audits should verify that all IRC client installations are running patched versions to prevent exploitation of this and similar vulnerabilities.