CVE-2000-1093 in Instant Messenger
Summary
by MITRE
Buffer overflow in AOL Instant Messenger before 4.3.2229 allows remote attackers to execute arbitrary commands via a long "goim" command.
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Analysis
by VulDB Data Team • 04/15/2025
The vulnerability described in CVE-2000-1093 represents a critical buffer overflow flaw in AOL Instant Messenger versions prior to 4.3.2229. This security weakness stems from inadequate input validation within the application's handling of the "goim" command, which is used for initiating instant messaging sessions. The flaw allows remote attackers to craft specially malformed messages that exceed the allocated buffer space, leading to memory corruption and potential code execution.
The technical implementation of this vulnerability aligns with CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. In the context of AOL Instant Messenger, the "goim" command processing routine fails to properly validate the length of incoming data, creating an opportunity for attackers to inject malicious code into the target system's memory space. When the application attempts to process the oversized command, it overflows the designated buffer and potentially overwrites critical program execution pointers or return addresses.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it enables remote code execution capabilities that can be leveraged for system compromise. Attackers can exploit this flaw to execute arbitrary commands with the privileges of the affected user account, potentially leading to complete system compromise. The vulnerability's remote nature means that attackers do not require physical access to the target system, making it particularly dangerous in networked environments where instant messaging applications are commonly used. This type of attack vector aligns with ATT&CK technique T1203, which covers exploitation for execution through remote command injection vulnerabilities.
Mitigation strategies for CVE-2000-1093 primarily focus on immediate software patching, as AOL released version 4.3.2229 to address the buffer overflow vulnerability. Organizations should implement comprehensive network monitoring to detect anomalous messaging traffic patterns that could indicate exploitation attempts. Additionally, network segmentation and access controls should be enforced to limit the potential impact of successful exploitation, while regular security assessments should verify that all instant messaging clients are properly updated. The vulnerability demonstrates the importance of proper input validation and bounds checking in client-side applications, highlighting how seemingly minor coding flaws can result in significant security breaches.