CVE-2004-1678 in PerlDesk
Summary
by MITRE
Directory traversal vulnerability in pdesk.cgi in PerlDesk allows remote attackers to read portions of arbitrary files and possibly execute arbitrary Perl modules via ".." sequences terminated by a %00 (null) character in the lang parameter, which can leak portions of the requested files if a compilation error message occurs.
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Analysis
by VulDB Data Team • 09/15/2024
The vulnerability described in CVE-2004-1678 represents a classic directory traversal flaw within the PerlDesk web application's pdesk.cgi script. This directory traversal vulnerability specifically affects the handling of the lang parameter, which is processed without adequate input validation or sanitization. The flaw allows remote attackers to manipulate file paths by incorporating ".." sequences followed by null character termination, creating a pathway to access arbitrary files on the server filesystem. The vulnerability operates by exploiting the lack of proper boundary checking in the parameter parsing logic, enabling attackers to navigate beyond the intended directory structure and potentially access sensitive system files or configuration data.
The technical implementation of this vulnerability leverages the interaction between the web application's file handling mechanisms and the specific encoding behavior of null characters in URL parameters. When the lang parameter contains sequences terminated by %00, the application fails to properly sanitize these inputs before using them in file operations. This creates a scenario where the application processes directory traversal sequences in a way that allows access to files outside the designated web root or application directories. The vulnerability becomes particularly dangerous because it can lead to information disclosure through compilation error messages that inadvertently reveal portions of the requested files, providing attackers with sensitive data about the system's internal structure and potentially exposing source code or configuration details.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially enable arbitrary code execution through the execution of Perl modules. Attackers can leverage the directory traversal capability to access and potentially execute Perl modules that are loaded by the application, creating a potential privilege escalation vector or backdoor access mechanism. The combination of file reading capabilities with the potential for module execution creates a comprehensive attack surface that could allow an adversary to gain significant control over the affected system. This vulnerability represents a critical security flaw that directly violates secure coding practices and can be exploited to compromise the confidentiality and integrity of the web application and underlying system.
Mitigation strategies for CVE-2004-1678 should focus on implementing robust input validation and sanitization mechanisms to prevent directory traversal attacks. The primary defense involves ensuring that all user-supplied input is properly validated and that directory traversal sequences are explicitly rejected or neutralized before being processed by the application. This includes implementing proper parameter encoding checks and preventing null character injection in URL parameters. Organizations should also consider implementing proper access controls and privilege separation to limit the impact of any successful exploitation attempts. The vulnerability aligns with CWE-22, which specifically addresses directory traversal flaws, and could be categorized under ATT&CK technique T1059 for execution of malicious code through scripting languages. Regular security audits and input validation testing should be conducted to prevent similar vulnerabilities from being introduced in future development cycles, ensuring that web applications properly sanitize all user inputs before processing them in file operations.