CVE-2005-0088 in Mod Python
Summary
by MITRE
The publisher handler for mod_python 2.7.8 and earlier allows remote attackers to obtain access to restricted objects via a crafted URL.
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Analysis
by VulDB Data Team • 01/19/2025
The vulnerability identified as CVE-2005-0088 represents a critical access control flaw within the mod_python web server module version 2.7.8 and earlier. This issue specifically affects the publisher handler component that manages how Python applications are executed within the Apache web server environment. The vulnerability stems from inadequate input validation and access restriction mechanisms that fail to properly sanitize user-supplied URLs before processing them within the application context. Attackers can exploit this weakness by crafting specially designed URLs that bypass normal access controls and gain unauthorized access to protected resources or restricted objects within the web application.
The technical implementation of this vulnerability resides in the URL parsing and object resolution logic of the mod_python publisher handler. When a request is made to the web server, the handler processes the URL path and attempts to map it to specific Python objects or methods within the application. The flaw occurs because the handler does not adequately validate the URL components or enforce proper access boundaries, allowing attackers to manipulate the URL structure to traverse directories or access objects that should normally be restricted. This type of vulnerability falls under the CWE-22 category of Improper Limitation of a Pathname to a Restricted Directory, commonly known as Path Traversal or Directory Traversal attacks. The vulnerability specifically enables attackers to exploit the underlying Python object model to access restricted resources through crafted URL parameters that are not properly sanitized or validated.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially enable full system compromise when combined with other attack vectors. An attacker who successfully exploits this vulnerability can access sensitive application data, configuration files, or system resources that should be protected from unauthorized access. This includes the possibility of accessing database connection strings, application credentials, or other sensitive information stored within the web application's restricted directories. The vulnerability is particularly dangerous in environments where mod_python serves applications with elevated privileges or where sensitive data is stored within the web application's directory structure. The attack can be executed remotely without requiring any special privileges or authentication, making it a severe threat to web application security. According to the ATT&CK framework, this vulnerability maps to the T1078 technique of Valid Accounts and T1566 technique of Phishing, as it allows attackers to bypass authentication mechanisms and gain access to restricted resources through manipulation of URL parameters.
Mitigation strategies for this vulnerability require immediate attention and implementation of multiple security controls. Organizations should upgrade to mod_python version 2.7.9 or later, which includes the necessary patches to address the URL validation and access control issues. Additionally, administrators should implement proper input validation at multiple layers of the application architecture, including URL sanitization and access control enforcement. The recommended approach involves implementing strict path validation that prevents directory traversal attempts and ensures that all URL components are properly validated against allowed patterns. Network-level protections such as web application firewalls can provide additional defense in depth by monitoring and blocking suspicious URL patterns that attempt to exploit this vulnerability. Security configurations should also enforce proper access controls and privilege separation to limit the potential impact even if an attacker manages to exploit the vulnerability. Regular security assessments and vulnerability scanning should be conducted to identify any similar weaknesses in the web application stack and ensure that all components are properly updated and configured according to security best practices.