CVE-2008-6505 in Struts
Summary
by MITRE
Multiple directory traversal vulnerabilities in Apache Struts 2.0.x before 2.0.12 and 2.1.x before 2.1.3 allow remote attackers to read arbitrary files via a ..%252f (encoded dot dot slash) in a URI with a /struts/ path, related to (1) FilterDispatcher in 2.0.x and (2) DefaultStaticContentLoader in 2.1.x.
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Analysis
by VulDB Data Team • 02/03/2025
The vulnerability identified as CVE-2008-6505 represents a critical directory traversal flaw affecting Apache Struts versions prior to 2.0.12 and 2.1.3. This security issue stems from inadequate input validation within the framework's URI processing mechanisms, specifically targeting the FilterDispatcher component in version 2.0.x and the DefaultStaticContentLoader in version 2.1.x. The vulnerability manifests when attackers exploit encoded dot dot slash sequences such as ..%252f within URIs that contain the /struts/ path, enabling unauthorized access to arbitrary files on the server filesystem. The flaw resides in the application's failure to properly sanitize and validate URI components before processing them, creating a path traversal attack vector that bypasses normal access controls and file system boundaries.
The technical exploitation of this vulnerability occurs through carefully crafted URI requests that leverage URL encoding to bypass standard input validation checks. When Apache Struts processes these malicious requests, the framework fails to properly decode and validate the encoded sequences, allowing the traversal characters to be interpreted as legitimate path navigation commands. This weakness specifically affects the framework's handling of static content loading and dispatcher functionality, where the application attempts to resolve file paths based on user-provided URI parameters. The vulnerability's impact is amplified by the fact that it operates at the framework level, meaning that any application built on Apache Struts 2.0.x or 2.1.x versions prior to the patched releases becomes susceptible to this attack vector. The flaw essentially allows attackers to navigate beyond the intended application boundaries and access files that should remain protected, including configuration files, source code, and potentially sensitive system data.
From an operational perspective, this vulnerability presents a severe risk to organizations deploying Apache Struts applications, as it enables attackers to obtain sensitive information without requiring authentication or specific privileges. The potential impact includes exposure of database connection strings, application configuration details, user credentials stored in configuration files, and potentially the complete source code of the application. The vulnerability's remote nature means that attackers can exploit it from outside the network perimeter, making it particularly dangerous for web applications accessible over the internet. Security professionals should note that this flaw aligns with CWE-22, which specifically addresses directory traversal vulnerabilities, and represents a classic example of improper input validation leading to unauthorized information disclosure. The attack pattern follows the techniques described in the MITRE ATT&CK framework under the T1083 discovery technique, where adversaries attempt to gather information about the target system's file structure to identify potential attack vectors and sensitive data locations.
Organizations affected by this vulnerability should immediately implement mitigations including upgrading to Apache Struts versions 2.0.12 or 2.1.3, which contain patches specifically addressing the directory traversal issue. Additionally, administrators should deploy input validation mechanisms at the application level to sanitize URI parameters and implement proper access controls for static content directories. Network-level mitigations such as web application firewalls can help detect and block malicious requests containing encoded traversal sequences, though these should not be considered complete solutions. Security monitoring should include detection of unusual file access patterns and suspicious URI requests containing multiple encoded traversal sequences. The vulnerability demonstrates the critical importance of proper input validation and the potential consequences of inadequate sanitization of user-provided data within web application frameworks, emphasizing the need for comprehensive security testing and regular patch management procedures to protect against similar weaknesses in other components of the application stack.