CVE-2001-1420 in Instant Messenger
Summary
by MITRE
AOL Instant Messenger (AIM) 4.7 allows remote attackers to cause a denial of service (application crash) via a long filename, possibly caused by a buffer overflow.
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Analysis
by VulDB Data Team • 11/13/2024
The vulnerability identified as CVE-2001-1420 affects AOL Instant Messenger version 4.7 and represents a classic buffer overflow condition that can be exploited to cause a denial of service attack. This flaw specifically manifests when the application processes a specially crafted filename that exceeds the allocated buffer space, leading to an application crash and subsequent service disruption. The vulnerability exists within the file transfer functionality of AIM, where the software fails to properly validate the length of incoming filenames before attempting to process them, creating an exploitable condition that can be remotely triggered by malicious actors.
The technical implementation of this vulnerability stems from inadequate input validation mechanisms within the AIM client software. When a user receives a file transfer request containing an excessively long filename, the application attempts to store this data in a fixed-size buffer without proper bounds checking. This buffer overflow condition causes the application to overwrite adjacent memory locations, resulting in unpredictable behavior including application termination, system instability, and potential system crashes. The vulnerability is classified as a buffer overflow under CWE-121, which specifically addresses the condition where insufficient bounds checking allows data to be written beyond the allocated buffer space, and it aligns with CWE-125, which covers the more general issue of reading data beyond the allocated buffer boundaries.
The operational impact of this vulnerability extends beyond simple application instability to create broader security concerns within corporate and enterprise environments. Attackers can exploit this weakness to disrupt communications services, particularly in scenarios where AIM is used for critical business operations or as part of larger communication infrastructures. The remote exploitation capability means that adversaries do not need physical access to the target system, making this vulnerability particularly dangerous in networked environments where AIM clients may be exposed to untrusted network traffic. This type of denial of service attack can be leveraged as part of larger assault campaigns or used to disrupt specific targets during critical communication periods.
Mitigation strategies for CVE-2001-1420 should include immediate software updates and patches provided by AOL to address the buffer overflow condition in AIM 4.7. Organizations should implement network segmentation to limit exposure of AIM clients to untrusted networks and consider deploying network monitoring solutions to detect anomalous file transfer patterns that may indicate exploitation attempts. The vulnerability demonstrates the importance of proper input validation and bounds checking in software development, aligning with ATT&CK technique T1499.004 for network denial of service attacks. Security administrators should also consider implementing application whitelisting policies that restrict the execution of AIM or similar instant messaging clients in high-security environments where such vulnerabilities could be exploited for more serious attacks. Additionally, regular security assessments and code reviews should be conducted to identify similar buffer overflow conditions in legacy applications that may not have received proper security updates over time.