CVE-2001-0233 in mICQ
Summary
by MITRE
Buffer overflow in micq client 0.4.6 and earlier allows remote attackers to cause a denial of service, and possibly execute arbitrary commands, via a long Description field.
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Analysis
by VulDB Data Team • 11/27/2024
The vulnerability identified as CVE-2001-0233 represents a critical buffer overflow flaw within the micq client version 0.4.6 and earlier implementations. This security weakness resides in the client's handling of the Description field parameter, which is commonly used in instant messaging protocols to convey user information and status updates. The micq client, being a popular command-line based instant messaging client for the ICQ protocol, was widely deployed across various operating systems and network environments, making this vulnerability particularly concerning from a security perspective.
The technical nature of this flaw stems from inadequate input validation and bounds checking within the micq client's processing of incoming Description field data. When a remote attacker crafts a maliciously long Description field and sends it to a vulnerable client, the application fails to properly validate the input length before copying it into a fixed-size buffer. This classic buffer overflow condition occurs because the software does not enforce proper boundary checks, allowing the excessive data to overwrite adjacent memory locations. According to CWE classification, this vulnerability maps directly to CWE-121 Stack-based Buffer Overflow, which is categorized under the broader weakness of insufficient boundary checking in memory operations. The flaw demonstrates poor defensive programming practices that violate fundamental security principles of input sanitization and memory management.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enabling remote code execution capabilities. When the buffer overflow occurs, it can corrupt the application's memory space, leading to unpredictable behavior including crashes, system instability, or in more severe cases, allowing attackers to inject and execute arbitrary code on the target system. The remote exploitation aspect means that attackers do not require local access to compromise systems, making this vulnerability particularly dangerous in networked environments where instant messaging clients are frequently used. This aligns with ATT&CK technique T1203, which describes exploitation of software vulnerabilities for remote code execution. The vulnerability affects the availability and integrity of the messaging service, potentially allowing attackers to gain unauthorized access to systems running vulnerable micq clients.
Mitigation strategies for this vulnerability primarily focus on immediate patching and updating to versions that address the buffer overflow issue. Users should upgrade to micq client versions beyond 0.4.6 where proper input validation and buffer management have been implemented. System administrators should conduct comprehensive inventory assessments to identify all instances of vulnerable software across their network infrastructure and ensure timely deployment of security patches. Additional defensive measures include implementing network segmentation to limit exposure of vulnerable clients, deploying intrusion detection systems to monitor for suspicious Description field patterns, and applying network access controls to restrict unauthorized communication. The vulnerability serves as a classic example of why secure coding practices are essential, particularly in applications that process untrusted data from network sources, and underscores the importance of following secure software development lifecycle practices that include thorough input validation and memory management controls.