CVE-2002-0592 in Instant Messenger
Summary
by MITRE
AOL Instant Messenger (AIM) allows remote attackers to steal files that are being transferred to other clients by connecting to port 4443 (Direct Connection) or port 5190 (file transfer) before the intended user.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 04/12/2019
The vulnerability described in CVE-2002-0592 represents a significant security flaw in AOL Instant Messenger that exploits the client-server communication protocols used for file transfers. This issue specifically targets the direct connection mechanisms employed by AIM, which operate through two primary ports: 4443 for direct connections and 5190 for file transfer operations. The vulnerability stems from the lack of proper authentication and authorization checks during the file transfer process, allowing malicious actors to intercept and steal files that are being transmitted between users. The attack vector is particularly concerning because it does not require any special privileges or complex exploitation techniques, making it accessible to a wide range of threat actors. This vulnerability directly impacts the confidentiality and integrity of data being shared through the AIM platform, as sensitive information could be intercepted during transmission without proper security measures in place.
The technical implementation of this vulnerability involves the manipulation of AIM's direct connection protocol, which was designed to facilitate peer-to-peer file transfers between users. When a user initiates a file transfer, the system establishes connections through the specified ports to enable data exchange. However, the flaw allows an attacker to establish connections to these ports before the legitimate recipient can connect, effectively positioning themselves as an intermediary in the communication channel. This type of attack falls under the category of man-in-the-middle attacks as defined by the ATT&CK framework, specifically targeting network communication and data interception capabilities. The vulnerability is particularly dangerous because it operates at the network layer, bypassing application-level security controls that might otherwise protect file transfers. The flaw demonstrates a classic case of insufficient session management and connection handling, where the system fails to properly validate connection requests or establish secure communication channels between parties.
The operational impact of CVE-2002-0592 extends beyond simple file theft to encompass broader security implications for users of the AIM platform. This vulnerability creates an environment where sensitive personal information, documents, and other confidential data can be intercepted without the knowledge of either party in the communication. The attack can occur silently in the background, with users remaining unaware that their files have been compromised during the transfer process. Organizations that relied on AIM for business communications would have been particularly vulnerable to this type of attack, as it could lead to intellectual property theft, privacy violations, and potential regulatory compliance issues. The vulnerability also demonstrates the importance of secure communication protocols and the dangers of relying on unencrypted or poorly authenticated direct connection mechanisms. From a cybersecurity perspective, this vulnerability highlights the need for proper input validation, authentication mechanisms, and secure session management in instant messaging applications.
Mitigation strategies for CVE-2002-0592 should focus on implementing proper authentication and authorization controls for direct connection operations, as well as establishing secure communication channels that prevent unauthorized access to file transfer processes. Network administrators should consider implementing firewall rules that restrict access to the vulnerable ports and monitor for suspicious connection patterns that may indicate exploitation attempts. The implementation of secure communication protocols such as SSL/TLS encryption for file transfers would significantly reduce the risk of interception attacks. Organizations should also consider implementing network segmentation and access controls to limit the exposure of vulnerable services to unauthorized users. From a defensive standpoint, this vulnerability reinforces the principles outlined in the CWE database regarding secure communication and session management, emphasizing the need for robust authentication mechanisms and proper connection handling in network applications. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in legacy systems and ensure that communication protocols meet current security standards. The vulnerability also underscores the importance of keeping instant messaging platforms updated with security patches and implementing comprehensive security policies that address both network-level and application-level threats.