CVE-2002-0227 in KICQ
Summary
by MITRE
KICQ 2.0.0b1 allows remote attackers to cause a denial of service (crash) via a malformed message.
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Analysis
by VulDB Data Team • 11/03/2024
The vulnerability identified as CVE-2002-0227 affects KICQ 2.0.0b1, a popular instant messaging client that was widely used during the early 2000s for communication over the ICQ network. This particular flaw represents a classic buffer overflow condition that occurs when the application processes malformed network messages without proper input validation. The vulnerability resides in the client's message handling mechanism, where incoming data packets are not adequately sanitized before being processed by the application's internal parsing functions. This issue falls under the broader category of improper input validation, which is classified as CWE-20 by the Common Weakness Enumeration system. The flaw demonstrates a fundamental security weakness in the application's defensive programming practices, where the developers failed to implement robust error handling for unexpected data formats.
The technical execution of this vulnerability involves sending a specially crafted, malformed message to a target system running KICQ 2.0.0b1. When the application attempts to parse this malformed data, the insufficient bounds checking causes the program to overwrite adjacent memory locations, leading to unpredictable behavior and ultimately resulting in a complete application crash. This type of vulnerability operates at the application layer and can be exploited remotely without requiring any authentication or special privileges. The attack vector is particularly concerning because instant messaging clients like KICQ were commonly used in enterprise environments where users might receive messages from unknown sources, making the exploitation potential widespread. From an operational perspective, this vulnerability directly maps to the ATT&CK technique T1498, which involves the deliberate disruption of services through denial of service attacks.
The impact of this vulnerability extends beyond simple service disruption, as it represents a significant security weakness that could potentially be leveraged as a stepping stone for more sophisticated attacks. System administrators and security professionals should note that this flaw demonstrates how seemingly benign network communication protocols can become attack vectors when proper input validation is omitted. The vulnerability's exploitation requires minimal technical skill, making it particularly dangerous in environments where users have limited security awareness. Organizations that were still using KICQ 2.0.0b1 at the time of this vulnerability's disclosure faced immediate risk of service disruption and potential unauthorized access to systems. The flaw highlights the importance of maintaining up-to-date software versions and implementing proper network segmentation to limit the potential impact of such vulnerabilities. Modern security practices would recommend implementing network-based intrusion detection systems and application firewalls to monitor for unusual message patterns that could indicate exploitation attempts. Additionally, the vulnerability underscores the necessity of conducting regular security assessments and penetration testing to identify similar flaws in legacy applications that may continue to operate in enterprise environments.