CVE-2005-2169 in Quick And Dirty Phpsource Printer
Summary
by MITRE
Directory traversal vulnerability in source.php in Quick & Dirty PHPSource Printer 1.1 and earlier allows remote attackers to read arbitrary files via ".../...//" sequences in the file parameter, which are reduced to "../" when PHPSource Printer uses a regular expression to remove "../" sequences.
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Analysis
by VulDB Data Team • 07/25/2017
The CVE-2005-2169 vulnerability represents a classic directory traversal flaw in the Quick & Dirty PHPSource Printer version 1.1 and earlier, demonstrating how seemingly simple input validation can lead to critical information disclosure risks. This vulnerability exists within the source.php script where user-supplied file parameters are processed without proper sanitization, creating an exploitable condition that allows remote attackers to access arbitrary files on the server filesystem. The flaw specifically manifests when attackers craft malicious input using sequences such as ".../...//" which, when processed by the PHPSource Printer application, are reduced to "../" through a regular expression that fails to account for nested directory traversal patterns. This type of vulnerability falls under CWE-22, which categorizes directory traversal attacks as a fundamental weakness in input validation, where insufficient restrictions on file paths enable attackers to access files outside the intended directory structure. The vulnerability is particularly concerning because it operates at the application level, requiring no special privileges or authentication to exploit, and can potentially lead to exposure of sensitive source code, configuration files, database credentials, or other confidential data stored on the server.
The technical implementation of this vulnerability exploits the flawed regular expression pattern used by PHPSource Printer to sanitize user input. When the application processes the file parameter containing malicious sequences, its regular expression fails to properly handle nested traversal patterns, allowing the attacker to bypass intended security controls. This represents a specific case of improper input filtering where the sanitization mechanism itself introduces the vulnerability rather than simply failing to validate input. The exploitation process typically involves crafting a URL parameter that includes multiple directory traversal sequences, which the application's regex removes in a way that still leaves the traversal functionality intact. The vulnerability demonstrates how regex-based sanitization can be fundamentally flawed when not properly designed to handle all possible input variations, particularly when dealing with path traversal attacks that may contain multiple levels of directory navigation. From an operational perspective, this vulnerability can be exploited by any remote user with access to the affected web application, making it particularly dangerous in environments where the application is publicly accessible.
The operational impact of CVE-2005-2169 extends beyond simple file disclosure, as successful exploitation can lead to complete compromise of the application server and potentially the entire underlying infrastructure. Attackers can leverage this vulnerability to access sensitive files such as database configuration files, application source code, user credentials, and other confidential information that may be stored in accessible directories. The exposure of source code is particularly damaging as it provides attackers with detailed information about application architecture, database schema, and potential additional vulnerabilities that may exist within the system. This type of information disclosure aligns with the ATT&CK technique T1566, which covers credential access through exploitation of vulnerabilities in web applications. Organizations affected by this vulnerability may face significant compliance violations, data breaches, and reputational damage, as the exposure of source code and sensitive configuration files can lead to further exploitation opportunities. The vulnerability also demonstrates the importance of proper input validation and the dangers of relying on simple regex-based sanitization for security purposes, particularly when dealing with path traversal scenarios that require comprehensive and robust validation mechanisms.
Mitigation strategies for CVE-2005-2169 should focus on implementing proper input validation and sanitization mechanisms that prevent directory traversal attacks at the application level. The most effective approach involves implementing a whitelist-based validation system that only allows specific, predetermined file paths rather than attempting to filter out dangerous patterns. Organizations should also implement proper path normalization techniques that properly resolve and validate file paths before processing user input, ensuring that traversal sequences are completely eliminated from the file path. Additionally, the application should be configured to run with minimal privileges and should not have access to sensitive files or directories that are not explicitly required for its operation. The implementation of proper access controls and the principle of least privilege should be enforced throughout the application, limiting the potential impact of successful exploitation attempts. Security patches and updates should be applied immediately to address the vulnerability, as the affected version of PHPSource Printer is no longer maintained and lacks proper security controls. Organizations should also consider implementing web application firewalls and intrusion detection systems that can detect and block suspicious traversal patterns in real-time, providing an additional layer of protection against this and similar vulnerabilities. The vulnerability serves as a reminder of the critical importance of proper input validation and the need for comprehensive security testing, particularly for applications that handle user-supplied file paths or other potentially dangerous inputs.