CVE-2000-0658 in AnalogX
Summary
by MITRE
Buffer overflow in AnalogX proxy server 4.04 and earlier allows remote attackers to cause a denial of service via a long USER command in the POP3 protocol.
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Analysis
by VulDB Data Team • 06/23/2024
The vulnerability identified as CVE-2000-0658 represents a critical buffer overflow flaw within the AnalogX proxy server version 4.04 and earlier implementations. This security weakness specifically manifests when processing the USER command within the Post Office Protocol version 3 framework, creating an exploitable condition that can be leveraged by remote attackers to disrupt service availability. The flaw stems from inadequate input validation mechanisms that fail to properly sanitize or limit the length of user-provided data during authentication sequences. When a malicious actor submits an excessively long USER command parameter, the server's memory buffer allocated for processing this specific command becomes overwritten, leading to unpredictable system behavior and potential application crashes.
The technical nature of this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The AnalogX proxy server implementation fails to enforce proper input length constraints during POP3 protocol processing, creating a scenario where attacker-controlled data can exceed the allocated buffer space. This particular implementation flaw affects the server's ability to maintain stable operation during legitimate authentication attempts, as the buffer overflow corrupts critical memory structures necessary for proper protocol handling. The vulnerability operates at the application layer and requires no authentication to exploit, making it particularly dangerous as it can be triggered through unauthenticated network connections.
From an operational impact perspective, this vulnerability directly enables remote denial of service attacks against affected AnalogX proxy server installations. Attackers can systematically disrupt service availability by sending malformed POP3 USER commands that trigger the buffer overflow condition, resulting in server crashes or application instability. The consequences extend beyond simple service disruption as the vulnerability may potentially allow for more sophisticated exploitation techniques if the server process is not properly protected against memory corruption attacks. Organizations relying on AnalogX proxy servers for email relaying or network traffic management face significant risk of service interruption, particularly in environments where email availability is critical for business operations. The vulnerability's remote exploitability means that attackers can target affected systems from anywhere on the network without requiring physical access or prior authentication credentials.
Mitigation strategies for this vulnerability should prioritize immediate patching of affected AnalogX proxy server installations to version 4.05 or later, which contains the necessary buffer overflow protections and input validation improvements. Network administrators should implement defensive measures including firewall rules that limit access to POP3 ports and monitor for unusual USER command patterns that may indicate exploitation attempts. The implementation of intrusion detection systems capable of identifying malformed POP3 traffic can provide early warning of potential attacks targeting this specific vulnerability. Additionally, organizations should consider implementing application-level protections such as input length validation and memory protection mechanisms to reduce the impact of similar vulnerabilities. According to ATT&CK framework category T1499, this vulnerability represents a denial of service technique that can be classified under the "Endpoint Denial of Service" tactic, emphasizing the importance of maintaining robust server stability and input validation controls. System administrators should also conduct comprehensive vulnerability assessments to identify other potential buffer overflow conditions within their network infrastructure and ensure proper security hardening practices are implemented across all server applications.