CVE-2004-0357 in Slmail Pro
Summary
by MITRE
Stack-based buffer overflows in SL Mail Pro 2.0.9 allow remote attackers to execute arbitrary code via (1) user.dll, (2) loadpageadmin.dll or (3) loadpageuser.dll.
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Analysis
by VulDB Data Team • 07/09/2017
The vulnerability identified as CVE-2004-0357 represents a critical stack-based buffer overflow issue affecting SL Mail Pro version 2.0.9, a mail server software that was widely deployed in enterprise environments during the early 2000s. This flaw exists within the software's handling of network requests and demonstrates a classic security weakness that has been documented in the CWE database under category CWE-121, which specifically addresses stack-based buffer overflow conditions. The vulnerability is particularly concerning because it affects multiple dynamic link libraries within the application's architecture, specifically targeting user.dll, loadpageadmin.dll, and loadpageuser.dll components.
The technical implementation of this vulnerability occurs when the application processes incoming network requests without proper bounds checking on user-supplied data. When remote attackers send maliciously crafted input to the mail server through these specific dll modules, the software fails to validate the length of the input data before copying it into fixed-size stack buffers. This allows attackers to overwrite adjacent memory locations, including return addresses and function pointers, effectively corrupting the program's execution flow. The stack-based nature of the overflow means that the memory corruption occurs in the program's stack space, making exploitation more predictable and reliable compared to heap-based overflows.
The operational impact of this vulnerability is severe and far-reaching, as it provides remote attackers with the capability to execute arbitrary code on the affected system with the privileges of the running mail server process. This typically translates to complete system compromise, allowing attackers to establish persistent backdoors, escalate privileges, or use the compromised server as a launch point for further attacks within the network. The attack vector is particularly dangerous because it requires no local access or authentication, making it a prime target for automated exploitation campaigns. According to ATT&CK framework, this vulnerability maps to T1059.007 (Command and Scripting Interpreter: PowerShell) and T1068 (Exploitation for Privilege Escalation) techniques, as attackers can leverage the arbitrary code execution capability to gain deeper system access.
The exploitation process typically involves crafting specially formatted network requests that cause the vulnerable dll modules to overflow their stack buffers, subsequently redirecting program execution to attacker-controlled code. This type of vulnerability has been historically exploited in numerous real-world attacks targeting mail servers, demonstrating the persistent threat that unpatched buffer overflows pose to network infrastructure. Organizations running SL Mail Pro 2.0.9 were particularly vulnerable to this attack because the software lacked proper input validation and memory management controls. The vulnerability highlights the critical importance of proper software security practices including bounds checking, stack canaries, and modern compiler protections that were becoming standard in the mid-2000s but were not implemented in this particular version of the software.
Mitigation strategies for CVE-2004-0357 involve immediate patching of the affected software to the latest available version that contains proper bounds checking and memory validation mechanisms. Organizations should also implement network segmentation and access controls to limit exposure of the mail server to untrusted networks, while monitoring for suspicious network traffic patterns that might indicate exploitation attempts. The incident serves as a historical example of why security updates and vulnerability management processes are critical components of enterprise security infrastructure, particularly for mission-critical applications like mail servers that handle sensitive data and serve as potential entry points for broader network attacks.