CVE-2003-0266 in SLWebMail
Summary
by MITRE
Multiple buffer overflows in SLWebMail 3 on Windows systems allows remote attackers to cause a denial of service and possibly execute arbitrary code via (1) a long Language parameter to showlogin.dll, (2) a long CompanyID parameter to recman.dll, (3) a long CompanyID parameter to admin.dll, or (4) a long CompanyID parameter to globallogin.dll.
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Analysis
by VulDB Data Team • 08/21/2025
The vulnerability identified as CVE-2003-0266 represents a critical security flaw in SLWebMail 3 software running on Windows operating systems. This issue stems from multiple buffer overflow conditions that occur when the application processes specific parameters passed to its various dynamic link libraries. The affected components include showlogin.dll, recman.dll, admin.dll, and globallogin.dll which handle different aspects of the webmail application's functionality. These buffer overflows create exploitable conditions that can be leveraged by remote attackers to compromise system integrity and availability.
The technical implementation of this vulnerability involves the manipulation of specific input parameters that the application fails to properly validate or bounds-check. When attackers submit excessively long strings to the Language parameter in showlogin.dll or the CompanyID parameter in recman.dll, admin.dll, and globallogin.dll, the software's memory management fails to handle these oversized inputs appropriately. This leads to memory corruption that can result in application crashes or potentially allow attackers to execute malicious code within the context of the vulnerable application. The underlying flaw aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enable remote code execution, making it particularly dangerous for enterprise environments. When exploited, these buffer overflows can allow attackers to gain unauthorized access to systems running SLWebMail 3, potentially leading to complete system compromise. The vulnerability affects Windows systems specifically, suggesting that the buffer overflow conditions are related to how Windows memory management handles these particular DLL components. Attackers can leverage these weaknesses to disrupt services, steal sensitive information, or establish persistent access to networked systems that rely on this webmail application for communication.
Organizations affected by CVE-2003-0266 should implement immediate mitigation strategies including applying vendor patches, disabling unnecessary services, and implementing network segmentation to limit potential attack vectors. The vulnerability's classification under ATT&CK technique T1203 suggests that attackers may use this flaw as part of a broader exploitation campaign targeting web applications. Security teams should conduct thorough vulnerability assessments of their SLWebMail installations and consider implementing intrusion detection systems to monitor for exploitation attempts. The remediation process should include updating to patched versions of SLWebMail 3, implementing proper input validation mechanisms, and establishing monitoring protocols to detect anomalous parameter usage that might indicate attempted exploitation. Additionally, organizations should review their overall web application security posture and consider implementing web application firewalls to provide additional protection against similar buffer overflow vulnerabilities.