CVE-2002-1945 in Smartmail Server
Summary
by MITRE
Buffer overflow in SmartMail Server 1.0 Beta 10 allows remote attackers to cause a denial of service (crash) via a long request to (1) TCP port 25 (SMTP) or (2) TCP port 110 (POP3).
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Analysis
by VulDB Data Team • 05/03/2025
The vulnerability identified as CVE-2002-1945 represents a critical buffer overflow flaw within SmartMail Server version 1.0 Beta 10, specifically affecting the server's handling of network communications through standard email protocols. This vulnerability resides in the server's implementation of both Simple Mail Transfer Protocol (SMTP) on port 25 and Post Office Protocol version 3 (POP3) on port 110, making it particularly dangerous as these are fundamental email services that organizations rely upon for communication infrastructure. The buffer overflow occurs when the server receives malformed input data that exceeds the allocated buffer space, leading to memory corruption and subsequent system instability.
The technical nature of this vulnerability places it firmly within CWE-121, which describes buffer overflow conditions where insufficient bounds checking allows attackers to write beyond allocated memory regions. The flaw manifests when remote attackers craft specially formatted requests that contain excessive data payloads, causing the server's input processing routines to overflow their designated memory buffers. This type of vulnerability is classified as a remote code execution risk, though in this specific case it results in denial of service rather than arbitrary code execution. The attack vector is particularly concerning because it requires no authentication and can be exploited from any network location, making it a prime target for automated scanning and exploitation tools.
From an operational impact perspective, this vulnerability creates a significant threat to email service availability and organizational communication infrastructure. When exploited successfully, the buffer overflow causes the SmartMail Server to crash and restart, resulting in immediate denial of service for all email services hosted on that server. This disruption affects both incoming and outgoing email traffic, potentially causing business interruption and communication failures across affected organizations. The vulnerability's impact extends beyond simple service disruption as it may also expose sensitive information through memory corruption or provide a foothold for more sophisticated attacks if additional vulnerabilities exist within the system. Network administrators face the challenge of maintaining email availability while dealing with the potential for unauthenticated attacks that can be easily automated and scaled.
Mitigation strategies for CVE-2002-1945 should prioritize immediate patching of the SmartMail Server software to address the buffer overflow conditions in both SMTP and POP3 protocol handlers. Organizations should implement network segmentation and access control measures to limit exposure of email servers to untrusted networks, while also deploying intrusion detection systems capable of identifying malformed email protocol traffic patterns. Network administrators should consider implementing rate limiting and connection throttling mechanisms to reduce the impact of potential exploitation attempts. The vulnerability highlights the importance of proper input validation and bounds checking in network services, aligning with ATT&CK technique T1203 which covers legitimate credentials and service exploitation. Additionally, organizations should conduct regular security assessments of their email infrastructure and maintain up-to-date vulnerability management processes to identify and remediate similar buffer overflow conditions in other network services. The incident underscores the critical need for secure coding practices and defensive programming techniques that prevent buffer overflows through proper memory management and input sanitization procedures.