CVE-2005-1439 in osTicket
Summary
by MITRE
Directory traversal vulnerability in attachments.php in osTicket allows remote attackers to read arbitrary files via .. sequences in the file parameter.
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Analysis
by VulDB Data Team • 06/19/2019
The vulnerability identified as CVE-2005-1439 represents a critical directory traversal flaw within the osTicket help desk system's attachments.php component. This weakness enables remote attackers to access arbitrary files on the server by manipulating the file parameter through directory traversal sequences using .. notation. The vulnerability specifically affects the file handling mechanism that processes attachment downloads, creating an avenue for unauthorized file access that could expose sensitive system information.
This directory traversal vulnerability falls under the Common Weakness Enumeration category CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal. The flaw occurs when the application fails to properly validate and sanitize user input before using it in file system operations. In the context of osTicket, the attachments.php script does not adequately filter or escape the file parameter, allowing malicious actors to navigate through the file system hierarchy and access files outside the intended attachment directory.
The operational impact of this vulnerability extends beyond simple information disclosure, as it could potentially allow attackers to access configuration files, database credentials, application source code, or other sensitive system artifacts. Remote attackers could exploit this weakness to gain unauthorized access to critical system components, potentially leading to complete system compromise. The vulnerability is particularly dangerous because it requires no authentication to exploit, making it a significant threat to any organization running vulnerable versions of osTicket. Attackers could leverage this flaw to extract database connection strings, administrative credentials, or other confidential information that could be used for further attacks.
Mitigation strategies for CVE-2005-1439 should focus on implementing proper input validation and sanitization techniques to prevent directory traversal attacks. Organizations should ensure that all user-supplied input is properly validated before being used in file system operations, implementing strict path validation that prevents access to parent directories using .. sequences. The recommended approach includes implementing a whitelist of allowed files, using absolute paths with proper directory restrictions, and ensuring that the application operates with minimal required privileges. Additionally, organizations should consider implementing web application firewalls that can detect and block directory traversal attempts, and regularly update their osTicket installations to versions that have addressed this vulnerability. The ATT&CK framework categorizes this type of vulnerability under T1083 - File and Directory Discovery, highlighting the reconnaissance phase of attack chains that leverage such flaws to enumerate system resources. Organizations should also implement proper monitoring and logging of file access patterns to detect potential exploitation attempts and maintain comprehensive backup strategies to recover from potential compromise scenarios.