CVE-2000-0872 in phpPhotoAlbum
Summary
by MITRE
explorer.php in PhotoAlbum 0.9.9 allows remote attackers to read arbitrary files via a .. (dot dot) attack.
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Analysis
by VulDB Data Team • 01/10/2025
The vulnerability identified as CVE-2000-0872 resides within the explorer.php component of PhotoAlbum version 0.9.9, representing a classic directory traversal attack vector that enables remote adversaries to access arbitrary files on the target system. This flaw demonstrates a fundamental lack of input validation and proper file access controls within the web application's file handling mechanisms. The vulnerability specifically exploits the absence of proper sanitization for user-supplied input that is used to construct file paths, allowing attackers to manipulate the application's behavior through carefully crafted directory navigation sequences.
The technical implementation of this vulnerability leverages the .. (dot dot) traversal sequence to navigate upward through the directory structure, bypassing intended access controls and potentially gaining access to sensitive files such as configuration data, database credentials, or system files. This represents a CWE-22 - Improper Limitation of a Pathname to a Restricted Directory vulnerability, where the application fails to properly validate or sanitize file paths before using them in file operations. The flaw exists because the application does not properly restrict user input that influences file access operations, allowing malicious actors to craft requests that traverse beyond the intended directory boundaries.
Operationally, this vulnerability presents a significant risk to web server security as it allows remote code execution capabilities through file inclusion attacks, potentially enabling attackers to read system files, access database information, or even execute malicious code on the target server. The impact extends beyond simple information disclosure, as the ability to read arbitrary files can expose sensitive configuration data, user credentials, and application logic that could facilitate further attacks. Attackers could leverage this vulnerability to escalate privileges, gain persistent access, or launch additional attacks against the compromised system. This vulnerability aligns with ATT&CK technique T1083 - File and Directory Discovery, as it enables adversaries to enumerate and access files that should remain protected.
Mitigation strategies for this vulnerability require immediate implementation of proper input validation and sanitization mechanisms within the PhotoAlbum application. The recommended approach involves implementing strict path validation that prevents directory traversal sequences from being processed, including the use of allowlists for permitted file paths and proper encoding of user input. Organizations should also implement proper access controls and file permissions to limit what files can be accessed through the web application. The vulnerability demonstrates the critical importance of input validation and the principle of least privilege in web application security, where all user-supplied data should be treated as potentially malicious and validated before use in file operations. Additionally, regular security audits and code reviews should be conducted to identify similar vulnerabilities in other components of the application stack.