CVE-2005-3288 in Mailsite Express
Summary
by MITRE
Mailsite Express allows remote attackers to upload and execute files with executable extensions such as ASP by attaching the file using the "compose page" feature, then accessing the file from the cache directory before saving or sending the message.
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Analysis
by VulDB Data Team • 07/26/2017
The vulnerability described in CVE-2005-3288 represents a critical security flaw in Mailsite Express email management software that enables remote code execution through improper file validation and handling mechanisms. This vulnerability specifically targets the compose page functionality where users can attach files to email messages, creating a pathway for attackers to bypass security controls and execute malicious code on the target system. The flaw exists in the application's handling of file attachments and cache directory access, allowing attackers to upload files with executable extensions such as asp without proper validation or sanitization.
The technical implementation of this vulnerability exploits the lack of proper input validation and sanitization within the email composition interface. When users attach files through the compose page feature, the application fails to adequately verify file extensions or content types, particularly allowing executable extensions like asp to be processed and stored in the cache directory. This weakness stems from inadequate security controls in the file attachment handling process, where the system does not distinguish between legitimate and malicious file types during the upload phase. The vulnerability is particularly dangerous because it operates at the point of user interaction where legitimate email functionality is being used, making it difficult to detect and prevent through traditional network monitoring approaches.
The operational impact of this vulnerability extends beyond simple unauthorized file execution, as it provides attackers with a persistent foothold for further exploitation within the target environment. Once an attacker successfully uploads and executes malicious code, they can establish backdoors, escalate privileges, or use the compromised system as a launching point for additional attacks against network resources. The cache directory access mechanism creates a persistent threat vector since cached files remain accessible until explicitly cleared, potentially allowing attackers to maintain access over extended periods. This vulnerability directly relates to CWE-434 which addresses insecure file upload and the broader category of insecure web application design patterns that enable arbitrary code execution.
Mitigation strategies for this vulnerability must address both the immediate security gap and the underlying architectural issues that allowed the flaw to exist. Organizations should implement strict file type validation and sanitization measures that prevent executable extensions from being processed through the compose page functionality. The cache directory access should be restricted and monitored to prevent unauthorized execution of uploaded files. Security controls should include mandatory file content verification, proper file extension filtering, and implementation of secure upload mechanisms that do not allow direct execution of uploaded content. This vulnerability aligns with ATT&CK technique T1190 which involves exploitation of remote services and T1059 which covers command and scripting interpreter usage, making it particularly dangerous for attackers seeking to establish persistent access. System administrators should also implement network segmentation, regular security audits, and comprehensive monitoring of file upload activities to detect and prevent exploitation attempts.