CVE-2008-4246 in Denora IRC Stats
Summary
by MITRE
Unspecified vulnerability in Denora IRC Stats Server before 1.4.1 allows remote IRC servers to cause a denial of service (application crash) via a crafted CTCP response.
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Analysis
by VulDB Data Team • 11/27/2017
The vulnerability identified as CVE-2008-4246 resides within the Denora IRC Stats Server software, a widely used tool for collecting and reporting statistics from internet relay chat networks. This particular flaw represents a critical security weakness that affects versions prior to 1.4.1, creating a potential vector for remote attackers to disrupt the availability of IRC network services. The vulnerability specifically manifests when remote IRC servers attempt to exploit a flaw in how the Denora server processes certain CTCP responses, which are part of the standard IRC protocol used for client-to-client communication.
The technical nature of this vulnerability stems from inadequate input validation within the CTCP response handling mechanism of the Denora server. CTCP or Client-to-Client Protocol messages are used in IRC networks for various purposes including version queries, time requests, and file transfers. When a remote IRC server sends a specially crafted CTCP response to the Denora stats server, the application fails to properly sanitize or validate the incoming data, leading to a buffer overflow or memory corruption condition. This flaw falls under the CWE-121 category of buffer overflow conditions, specifically in heap-based buffer overflows that occur when the server attempts to process malformed CTCP responses.
The operational impact of this vulnerability extends beyond simple service disruption, as it provides attackers with a method to cause application crashes that can result in complete denial of service for the affected IRC network statistics collection. Network administrators who rely on Denora for monitoring their IRC infrastructure may find their servers becoming unresponsive, requiring manual intervention and restart procedures that can disrupt network monitoring capabilities. This type of vulnerability particularly affects large IRC networks where continuous monitoring is essential for maintaining service quality and detecting potential security incidents.
The attack vector for this vulnerability is particularly concerning as it requires minimal privileges from the attacker, who only needs to be connected to the IRC network and able to send CTCP responses to the target server. This aligns with ATT&CK technique T1499.004 for network denial of service attacks, where adversaries leverage protocol-specific weaknesses to disrupt services. The vulnerability demonstrates the importance of input validation in network services, particularly those that process data from untrusted sources. Organizations should consider implementing network segmentation and access controls to limit exposure, while also ensuring that all network services undergo regular security assessments to identify and remediate similar vulnerabilities.
Mitigation strategies for this vulnerability should include immediate patching to version 1.4.1 or later, which contains the necessary fixes for proper CTCP response handling. Additionally, network administrators should implement monitoring solutions that can detect unusual patterns in CTCP traffic that might indicate exploitation attempts. The vulnerability highlights the necessity of following secure coding practices such as those outlined in the OWASP Secure Coding Practices, particularly regarding input validation and memory management. Regular security audits of IRC infrastructure components and maintaining up-to-date software versions form essential defensive measures against this class of vulnerability, which represents a common pattern in network protocol implementations where insufficient validation leads to service disruption.