CVE-2006-5210 in Ironmail
Summary
by MITRE
Directory traversal vulnerability in IronWebMail before 6.1.1 HotFix-17 allows remote attackers to read arbitrary files via a GET request to the IM_FILE identifier with double-url-encoded "../" sequences ("%252e%252e/").
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Analysis
by VulDB Data Team • 04/24/2026
The vulnerability identified as CVE-2006-5210 represents a critical directory traversal flaw in IronWebMail email server software prior to version 6.1.1 HotFix-17. This weakness enables remote attackers to access arbitrary files on the server by exploiting improper input validation mechanisms within the application's file handling processes. The vulnerability specifically manifests when processing GET requests containing the IM_FILE identifier parameter, which is designed to facilitate file operations within the webmail interface. Attackers can leverage this vulnerability by crafting malicious requests with double-url-encoded "../" sequences, specifically formatted as "%252e%252e/" to bypass initial validation checks and traverse the directory structure beyond intended boundaries.
The technical implementation of this vulnerability stems from insufficient sanitization of user-supplied input parameters, particularly those used for file path resolution. When IronWebMail processes the IM_FILE parameter, it fails to properly validate or sanitize the input before using it in file system operations. The double-url encoding technique employed by attackers serves as a sophisticated bypass mechanism that can evade basic input validation routines, allowing the malicious sequences to persist through the initial parsing stages and ultimately reach the file system access layer. This particular implementation pattern aligns with common directory traversal vulnerabilities classified under CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The vulnerability demonstrates a classic weakness in input validation and access control mechanisms, where user-controllable data directly influences file system operations without adequate sanitization.
The operational impact of this vulnerability extends far beyond simple information disclosure, as it provides attackers with unauthorized access to sensitive server files that may contain configuration data, user credentials, application source code, or other confidential information. Remote attackers can leverage this vulnerability to access system files, application binaries, and potentially database files that are not intended to be exposed through the web interface. The implications are particularly severe for email server environments where such systems often contain sensitive user data, including personal communications, business correspondence, and potentially confidential organizational information. This vulnerability creates a persistent threat vector that can be exploited by attackers without requiring authentication or prior access to the system, making it particularly dangerous for webmail services that handle large volumes of sensitive data. According to ATT&CK framework categorization, this vulnerability maps to T1083 (File and Directory Discovery) and T1566 (Phishing), as it enables attackers to discover and potentially exfiltrate sensitive files through phishing campaigns that leverage the compromised email server.
Mitigation strategies for CVE-2006-5210 should prioritize immediate application of the vendor-provided patch or upgrade to IronWebMail version 6.1.1 HotFix-17, which addresses the input validation deficiencies that enable this attack vector. Organizations should implement robust input validation mechanisms that sanitize all user-supplied data before processing, particularly for parameters used in file system operations. Network-level protections such as web application firewalls and intrusion prevention systems can provide additional layers of defense by monitoring for suspicious URL patterns and malformed requests containing directory traversal sequences. Security configuration reviews should include verification of proper file access controls and implementation of least privilege principles for web application processes, ensuring that the application operates with minimal required permissions. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other web applications and services within the organization's infrastructure, as this type of vulnerability often indicates broader security weaknesses in input handling and validation processes. The vulnerability also underscores the importance of proper security coding practices and regular security updates to prevent exploitation of known weaknesses in web applications.