CVE-2002-0322 in Yahoo!
Summary
by MITRE
Yahoo! Messenger 4.0 sends user passwords in cleartext, which could allow remote attackers to gain privileges of other users via sniffing.
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Analysis
by VulDB Data Team • 06/27/2021
Yahoo! Messenger version 4.0 contained a critical security flaw that exposed user credentials through unencrypted communication channels. The vulnerability stemmed from the application's failure to implement proper encryption protocols during authentication processes, resulting in passwords being transmitted in plain text format across network connections. This fundamental design flaw created an exploitable condition where network traffic could be intercepted and analyzed by malicious actors possessing basic packet sniffing capabilities.
The technical implementation of this vulnerability aligns with CWE-312, which specifically addresses the exposure of sensitive information through cleartext transmission. When users logged into Yahoo! Messenger 4.0, their authentication credentials were sent without any form of encryption or obfuscation, making them immediately accessible to anyone who could capture network packets. This weakness particularly affected users connected through unsecured networks or public Wi-Fi hotspots where traffic interception was trivial. The flaw essentially provided attackers with a direct pathway to obtain valid user credentials, enabling them to assume the identity of legitimate users and potentially access their personal data, contacts, and communication history.
From an operational perspective, this vulnerability created significant risk for Yahoo Messenger accounts, particularly in environments where network monitoring was possible.
The attack surface for this vulnerability was extensive and included any network environment where Yahoo Messenger were essentially providing attackers with a free pass to compromise user accounts, making this vulnerability particularly dangerous in environments where sensitive communications were expected to remain confidential. The lack of encryption in the authentication process represented a fundamental failure in secure communication design principles and violated basic security practices that should have been implemented in any messaging application handling user credentials.
The remediation for this vulnerability required immediate implementation of encrypted communication protocols and proper credential handling mechanisms. Users needed to upgrade to newer versions of Yahoo! Messenger that implemented secure authentication methods, while system administrators should have enforced network security policies to prevent unencrypted communication. This vulnerability highlighted the critical importance of implementing end-to-end encryption for all authentication processes and demonstrated how seemingly minor implementation flaws could create substantial security risks. The incident underscored the necessity of following established security standards and protocols to prevent attackers from exploiting basic communication weaknesses.