CVE-2003-0864 in IRCD
Summary
by MITRE
Buffer overflow in m_join in channel.c for IRCnet IRCD 2.10.x to 2.10.3p3 allows remote attackers to cause a denial of service.
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Analysis
by VulDB Data Team • 10/07/2024
The vulnerability identified as CVE-2003-0864 represents a critical buffer overflow condition within the IRCnet IRCD software version 2.10.x through 2.10.3p3. This flaw specifically resides in the m_join function located within the channel.c source file, which forms a core component of the IRC daemon responsible for managing channel join operations. The buffer overflow occurs when processing user join requests to IRC channels, creating a potential exploitation vector that can be leveraged by remote attackers to disrupt service availability.
The technical implementation of this vulnerability stems from inadequate input validation and buffer management within the m_join function. When a client sends a join command to the IRC server, the software fails to properly validate the length of the channel name or associated parameters before copying them into fixed-size buffers. This classic buffer overflow scenario allows an attacker to overwrite adjacent memory locations, potentially leading to arbitrary code execution or system instability. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, which represents a fundamental flaw in memory management practices where data exceeds allocated buffer boundaries.
From an operational perspective, this vulnerability directly impacts the availability and stability of IRC networks that utilize affected IRCD versions. Remote attackers can exploit this weakness to trigger denial of service conditions by sending specially crafted join requests that cause the IRC daemon to crash or behave unpredictably. The impact extends beyond simple service disruption as the vulnerability may enable more sophisticated attacks depending on the system configuration and memory layout. Network administrators responsible for maintaining IRC infrastructure face significant risks when running vulnerable versions, as the attack surface remains accessible to anyone with network connectivity to the affected servers.
The exploitation of this vulnerability aligns with several ATT&CK tactics including privilege escalation and denial of service. The attack pattern typically involves sending malformed join commands that trigger the buffer overflow condition, potentially allowing attackers to cause system crashes or force service restarts. Security practitioners should note that this vulnerability was addressed through proper input validation and buffer size enforcement in subsequent software releases. Organizations maintaining legacy IRC infrastructure should prioritize immediate patching and implement network segmentation controls to limit exposure. Additionally, monitoring for unusual join patterns and implementing rate limiting on channel operations can serve as effective mitigation strategies while awaiting full patch deployment.
This vulnerability demonstrates the critical importance of proper input validation in network services and highlights how seemingly minor implementation flaws can result in significant operational disruptions. The impact of buffer overflows in server applications extends beyond immediate service availability concerns to encompass potential data integrity issues and system compromise risks. Modern security practices emphasize the need for robust memory management and input sanitization as fundamental requirements for network service security, making CVE-2003-0864 a relevant case study in understanding the evolution of software security practices within the IRC ecosystem and broader network infrastructure domains.