CVE-2004-1558 in YPOPs!
Summary
by MITRE
Multiple stack-based buffer overflows in YPOPs! (aka YahooPOPS) 0.4 through 0.6 allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a long (1) POP3 USER command or (2) SMTP request.
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Analysis
by VulDB Data Team • 10/13/2025
The vulnerability identified as CVE-2004-1558 affects YPOPs for email connectivity, particularly those configured to accept incoming connections for POP3 or SMTP services.
The technical implementation of this vulnerability involves the exploitation of memory management flaws within the YPOPs! software architecture. When a remote attacker sends a malformed POP3 USER command or SMTP request containing excessive data, the application's input handling routines fail to validate the payload length against predetermined buffer boundaries. This results in a stack-based buffer overflow that can overwrite adjacent memory locations, potentially corrupting program execution flow and leading to system instability. The buffer overflow conditions are triggered by the specific parsing logic used in the software's network protocol handlers, which do not implement proper bounds checking or input sanitization before copying user data into fixed-size buffers. This type of vulnerability falls under the CWE-121 category of stack-based buffer overflow, where insufficient bounds checking allows attackers to overwrite stack memory and potentially gain control over program execution.
The operational impact of CVE-2004-1558 extends beyond simple denial of service conditions to potentially enable remote code execution, making it a particularly dangerous vulnerability for systems running vulnerable versions of YPOPs, allowing them to crash the application and potentially execute arbitrary code with the privileges of the running process. This capability enables attackers to establish persistent access to compromised systems, escalate privileges, or use the compromised system as a launching point for further attacks within the network infrastructure. The vulnerability affects both POP3 and SMTP protocols, providing multiple attack vectors for potential exploitation and increasing the attack surface for malicious actors. Systems that are configured to accept incoming connections for email services are particularly at risk, as they provide direct pathways for attackers to send malicious payloads that trigger the buffer overflow conditions.
Mitigation strategies for CVE-2004-1558 should focus on immediate software updates and network-level protections to prevent exploitation of the buffer overflow conditions. Organizations should prioritize upgrading to patched versions of YPOPs! that address the identified buffer overflow vulnerabilities, as the original vulnerable versions have been superseded by secure releases. Network administrators should implement proper input validation and sanitization at network boundaries, using firewalls and intrusion prevention systems to monitor and filter suspicious email protocol traffic. The implementation of proper bounds checking and memory protection mechanisms within the application code would prevent the exploitation of these buffer overflows, aligning with recommended practices from the software security community. Additionally, system hardening measures including disabling unnecessary services, implementing proper access controls, and maintaining updated security patches across all network infrastructure components can significantly reduce the risk of exploitation. This vulnerability demonstrates the importance of proper input validation and memory safety practices in network applications, as outlined in various security frameworks including those referenced in the ATT&CK framework's application layer exploitation techniques, which emphasize the need for robust software validation to prevent memory corruption vulnerabilities.