CVE-2002-1862 in Smartmail Server
Summary
by MITRE
SmartMail Server 2.0 allows remote attackers to cause a denial of service (crash) by sending data and closing the connection before all the data has been sent.
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Analysis
by VulDB Data Team • 05/03/2025
The vulnerability identified as CVE-2002-1862 affects SmartMail Server version 2.0, a mail server implementation that suffers from a critical denial of service flaw in its network protocol handling. This vulnerability represents a classic example of improper input validation and connection management within network services, where the server fails to properly handle abrupt disconnections during data transfer operations. The flaw exists in the server's protocol implementation where it does not adequately validate or handle partial data transfers, creating a condition where malicious actors can exploit the system's lack of proper error handling mechanisms.
The technical implementation of this vulnerability stems from the server's failure to properly manage TCP connection states and data reception sequences. When a remote attacker sends data to the SmartMail Server and immediately closes the connection before the complete data payload has been received, the server's internal state management becomes inconsistent. This condition triggers an unhandled exception or memory corruption within the server's data processing routines, leading to a complete service crash. The vulnerability specifically manifests during the data reception phase of the mail server protocol, where the server expects complete data transfers but encounters premature connection termination. This behavior aligns with CWE-400, which categorizes improper handling of exceptional conditions in software systems, and represents a failure in proper resource management and error recovery procedures.
The operational impact of this vulnerability extends beyond simple service disruption to potentially enable more sophisticated attack vectors when combined with other exploitation techniques. An attacker can repeatedly exploit this flaw to maintain persistent denial of service conditions against the mail server, effectively rendering the email service unavailable to legitimate users. The vulnerability's remote nature means that attackers do not require physical access or local system privileges to exploit the flaw, making it particularly dangerous in networked environments where mail servers serve critical communication infrastructure. This vulnerability directly impacts the availability component of the CIA triad and can be categorized under ATT&CK technique T1499.004, which focuses on network denial of service attacks that target communication protocols and services. Organizations relying on SmartMail Server 2.0 for email services face significant operational risks, as the service disruption can affect business continuity and communication workflows across enterprise networks.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and connection state management within the server's protocol handling components. System administrators should prioritize applying vendor patches or updates that address the specific connection handling flaws in SmartMail Server 2.0, while also implementing network-level protections such as connection rate limiting and protocol validation filters. The recommended approach involves configuring the server to properly handle incomplete data transfers and implement robust error recovery mechanisms that prevent crashes when connections are terminated unexpectedly. Additionally, network monitoring should be enhanced to detect and alert on unusual connection patterns that may indicate exploitation attempts, while firewall rules can be configured to limit the impact of such attacks through connection throttling and rate limiting measures. Organizations should also consider implementing redundant mail server infrastructure to maintain service availability during exploitation attempts, and establish incident response procedures that can quickly address and recover from such denial of service conditions.