CVE-2006-0611 in @Mail
Summary
by MITRE
Directory traversal vulnerability in compose.pl in @Mail 4.3 and earlier for Windows allows remote attackers to upload arbitrary files to arbitrary locations via a .. (dot dot) in the unique parameter.
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Analysis
by VulDB Data Team • 08/05/2017
The vulnerability identified as CVE-2006-0611 represents a critical directory traversal flaw in the @Mail email server software version 4.3 and earlier for Windows platforms. This security weakness resides within the compose.pl script which handles email composition functionality, creating a pathway for malicious actors to exploit improper input validation mechanisms. The vulnerability specifically manifests when the application fails to adequately sanitize user-supplied input parameters, particularly the unique parameter that controls file naming and location during email attachment processing. Attackers can leverage this weakness by crafting malicious requests containing directory traversal sequences using the .. (dot dot) notation to navigate outside of intended directories and gain unauthorized access to the file system.
The technical implementation of this vulnerability stems from insufficient validation of the unique parameter in the compose.pl script, which operates under the assumption that all user input will be properly formatted and safe for processing. When the application processes a request containing .. sequences within the unique parameter, it fails to properly resolve the intended file path, allowing attackers to manipulate the file system location where attachments are saved. This flaw directly relates to CWE-22, which defines improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The vulnerability enables attackers to upload arbitrary files to arbitrary locations on the target system, potentially leading to complete system compromise through the execution of malicious code or the installation of backdoors.
The operational impact of this vulnerability extends far beyond simple data theft or unauthorized file access. Attackers can exploit this weakness to upload malicious files such as web shells, trojans, or other harmful payloads to locations where they can be executed with the privileges of the @Mail service account. This creates a persistent threat vector that could allow attackers to maintain long-term access to the compromised system, escalate privileges, or use the compromised server as a launch point for further attacks within the network. The vulnerability also enables attackers to overwrite existing system files, potentially causing system instability or complete service disruption. According to ATT&CK framework, this vulnerability maps to T1059 for command and scripting interpreter and T1078 for valid accounts, as attackers can leverage compromised service accounts to execute malicious code and maintain persistence.
Mitigation strategies for CVE-2006-0611 should prioritize immediate patching of the @Mail software to version 4.4 or later, which contains the necessary security fixes to prevent directory traversal attacks. Organizations should implement input validation measures that strictly sanitize all user-supplied parameters, particularly those related to file naming and path specification. Network segmentation and access controls should be implemented to limit the attack surface, ensuring that email servers operate with minimal privileges and restricted file system access. Additionally, regular security audits should validate that all input parameters are properly validated and that no similar vulnerabilities exist in other components of the email infrastructure. System monitoring should be enhanced to detect unusual file upload patterns or attempts to access restricted directories, while logging should capture all file system operations related to email processing to aid in forensic analysis and incident response activities.