CVE-2008-0259 in minimal Gallery
Summary
by MITRE
Multiple directory traversal vulnerabilities in _mg/php/mg_thumbs.php in minimal Gallery 0.8 allow remote attackers to read arbitrary files via a .. (dot dot) in the (1) thumbcat and (2) thumb parameters.
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Analysis
by VulDB Data Team • 10/14/2024
The vulnerability described in CVE-2008-0259 represents a critical directory traversal flaw affecting the minimal Gallery 0.8 web application. This issue resides within the _mg/php/mg_thumbs.php script which handles thumbnail generation functionality. The vulnerability manifests when the application fails to properly validate user-supplied input parameters, specifically the thumbcat and thumb parameters, allowing attackers to manipulate file paths through the use of .. (dot dot) sequences. This flaw falls under the category of CWE-22 - Improper Limitation of a Pathname to a Restricted Directory, which is a fundamental security weakness in input validation and path handling mechanisms. The vulnerability enables remote attackers to access arbitrary files on the server filesystem, potentially exposing sensitive information including configuration files, user data, and system credentials.
The technical exploitation of this vulnerability occurs through manipulation of the thumbcat and thumb parameters in the mg_thumbs.php script. When an attacker supplies directory traversal sequences such as ../../etc/passwd or ../../../windows/system32/drivers/etc/hosts, the application processes these inputs without adequate sanitization or validation. The minimal Gallery 0.8 application fails to implement proper input filtering or path normalization, allowing the .. sequences to navigate outside the intended thumbnail directory. This creates a direct path traversal condition where the application attempts to access files outside its designated scope. The vulnerability can be classified under the ATT&CK technique T1566.001 - Phishing: Spearphishing Attachment, as it typically exploits user interaction with maliciously crafted URLs or file paths. The attack vector requires no special privileges and can be executed remotely, making it particularly dangerous in web environments.
The operational impact of this vulnerability extends beyond simple file disclosure, potentially compromising the entire web application infrastructure and underlying system. Attackers could access sensitive configuration files containing database credentials, application secrets, or other critical system information. The vulnerability also enables potential further exploitation through the access to system files that may contain additional attack vectors or sensitive data. Depending on the system configuration, attackers might gain access to user session data, application logs, or even system-level files that could facilitate privilege escalation. The implications are particularly severe for web applications that handle sensitive data or operate in regulated environments where data protection compliance is mandatory.
Mitigation strategies for CVE-2008-0259 should focus on implementing robust input validation and proper path handling mechanisms. Organizations should immediately upgrade to a patched version of minimal Gallery or implement proper parameter sanitization to prevent directory traversal attacks. The solution involves implementing strict input validation that rejects or filters out directory traversal sequences such as .. or %2e%2e. Additionally, implementing a whitelist approach for valid thumbnail parameters and ensuring proper path normalization can prevent exploitation. Security measures should include restricting file access permissions to the web application, implementing proper access controls, and monitoring for suspicious file access patterns. The remediation process should also include regular security assessments and input validation testing to identify similar vulnerabilities in other components of the application stack. Organizations should also consider implementing web application firewalls that can detect and block directory traversal attempts, and ensure that all web applications undergo regular security auditing to prevent similar issues from occurring in the future.