CVE-2004-1945 in eXchange POP3
Summary
by MITRE
Buffer overflow in Kinesphere eXchange POP3 allows remote attackers to execute arbitrary code via a long MAIL FROM field.
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Analysis
by VulDB Data Team • 09/12/2025
The vulnerability identified as CVE-2004-1945 represents a critical buffer overflow flaw within the Kinesphere eXchange POP3 server implementation. This security weakness resides in the server's handling of the MAIL FROM field within the Simple Mail Transfer Protocol, specifically affecting the eXchange POP3 component of the Kinesphere email server suite. The flaw occurs when the server processes incoming mail commands without adequate bounds checking on the MAIL FROM field length, creating an exploitable condition that can be leveraged by remote attackers to gain unauthorized system access.
The technical nature of this vulnerability stems from improper input validation within the POP3 server's command processing logic. When a remote attacker sends a specially crafted email message containing an excessively long MAIL FROM field, the server's buffer allocation fails to account for the overflow condition. This classic buffer overflow scenario allows malicious input to overwrite adjacent memory locations, potentially corrupting program execution flow and enabling arbitrary code execution. The vulnerability operates at the application layer and requires no authentication to exploit, making it particularly dangerous as it can be triggered through normal email transmission protocols.
The operational impact of this vulnerability extends beyond simple remote code execution, as it can lead to complete system compromise and unauthorized access to sensitive email data. Attackers can leverage this flaw to establish persistent backdoors, escalate privileges, or use the compromised server as a launch point for further attacks within the network infrastructure. The vulnerability affects organizations using Kinesphere eXchange POP3 servers, potentially exposing email communications, user credentials, and confidential business data to unauthorized access. The remote exploit capability means that attackers can target systems from anywhere on the internet without requiring physical access or network proximity.
Mitigation strategies for CVE-2004-1945 should prioritize immediate patch application from Kinesphere vendor, as this represents a critical security flaw that has been widely documented and exploited in the wild. Organizations should implement network segmentation and firewall rules to restrict POP3 service access to trusted networks only, while also deploying intrusion detection systems to monitor for suspicious MAIL FROM field patterns. Additionally, administrators should consider disabling unnecessary email services, implementing proper input validation at network boundaries, and conducting regular security assessments to identify similar buffer overflow vulnerabilities in other email server implementations. This vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a typical attack vector categorized under ATT&CK technique T1190 for exploit public-facing application, emphasizing the importance of proper input validation and memory management in email server security.
The broader implications of this vulnerability highlight the critical importance of secure coding practices and regular security updates in email server infrastructure. Organizations should implement comprehensive security monitoring, maintain updated vulnerability databases, and ensure proper code review processes that include buffer overflow detection. The ease of exploitation and potential for system compromise make this vulnerability particularly concerning for enterprise email environments where email servers serve as critical infrastructure components. Regular security training for system administrators and implementation of automated patch management systems become essential defensive measures against similar buffer overflow vulnerabilities that may exist in other legacy email server implementations.