CVE-2003-1450 in BitchX
Summary
by MITRE
BitchX 75p3 and 1.0c16 through 1.0c20cvs allows remote attackers to cause a denial of service (segmentation fault) via a malformed RPL_NAMREPLY numeric 353 message.
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Analysis
by VulDB Data Team • 09/27/2024
The vulnerability identified as CVE-2003-1450 affects BitchX IRC clients version 75p3 and 1.0c16 through 1.0c20cvs, representing a critical denial of service weakness that can be exploited remotely. This flaw manifests when the affected IRC client receives a malformed RPL_NAMREPLY numeric 353 message, which is part of the standard IRC protocol used for transmitting user lists in channels. The vulnerability stems from inadequate input validation within the client's message parsing mechanism, specifically in how it handles the RPL_NAMREPLY response that contains user information for channels. When processing this particular numeric message, the client fails to properly validate the message structure and content, leading to a segmentation fault that causes the application to crash and terminate unexpectedly.
The technical implementation of this vulnerability involves the client's failure to sanitize or validate the length and format of user names contained within the RPL_NAMREPLY message. According to CWE-129, this represents an input validation flaw where the application does not properly check the boundaries of input data before processing it. The segmentation fault occurs because the client attempts to access memory locations that are either invalid or unauthorized, typically due to buffer overflows or improper pointer dereferencing when handling malformed data. This particular numeric response is used by IRC servers to provide a list of users in a channel, and when the client receives a message with malformed user list data, it fails to handle the edge case properly, resulting in the application crash.
From an operational perspective, this vulnerability creates significant risk for users and network administrators who rely on BitchX clients for IRC communication. The remote exploitation capability means that an attacker can trigger the denial of service condition without requiring local access or authentication, making it particularly dangerous in networked environments where IRC clients are actively used. The impact extends beyond individual client crashes to potentially disrupt communication channels and services that depend on these clients. According to ATT&CK technique T1499.004, this vulnerability represents a network denial of service attack vector that can be leveraged to disrupt services and communications within IRC networks. The vulnerability affects the availability aspect of the CIA triad by making IRC clients unreliable and potentially unusable until the application is restarted.
The mitigation strategies for this vulnerability involve implementing proper input validation and bounds checking within the IRC client's message parsing routines. System administrators should ensure that all affected BitchX versions are updated to patched releases that properly validate incoming numeric messages before processing them. The fix typically involves adding bounds checking to verify that user list entries in RPL_NAMREPLY messages conform to expected formats and lengths. Additionally, network monitoring solutions can be configured to detect and alert on malformed IRC numeric messages that might indicate exploitation attempts. Organizations should also consider implementing network segmentation and access controls to limit exposure to potential attackers who might attempt to exploit this vulnerability. The vulnerability serves as a reminder of the importance of proper input validation in network protocols and the critical need for robust error handling in client applications that process untrusted network data.