CVE-2008-5688 in MediaWiki
Summary
by MITRE
MediaWiki 1.8.1, and other versions before 1.13.3, when the wgShowExceptionDetails variable is enabled, sometimes provides the full installation path in a debugging message, which might allow remote attackers to obtain sensitive information via unspecified requests that trigger an uncaught exception.
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Analysis
by VulDB Data Team • 08/03/2021
MediaWiki versions prior to 1.13.3 contain a sensitive information disclosure vulnerability that occurs when the wgShowExceptionDetails configuration variable is enabled. This flaw manifests when the application encounters an uncaught exception during processing, causing it to display debugging information that includes the complete server installation path. The vulnerability represents a classic information disclosure weakness that can provide attackers with critical system details that aid in subsequent exploitation attempts. When an attacker can trigger an exception through crafted requests, the application reveals the full file system path where MediaWiki is installed, potentially exposing directory structures, file locations, and system configuration details that should remain hidden from external entities.
The technical mechanism behind this vulnerability involves the application's error handling mechanism when debug mode is enabled. The wgShowExceptionDetails variable controls whether detailed error information is displayed to users, and when set to true, it enables the display of stack traces and system paths that are typically suppressed in production environments. This configuration creates a pathway for attackers to exploit the application's response to malformed or malicious input that causes exceptions to be thrown. The vulnerability falls under the CWE-200 category for Information Exposure and can be classified as a Path Traversal or Path Disclosure issue within the ATT&CK framework's reconnaissance phase. The flaw demonstrates poor input validation and error handling practices that expose internal system information to unauthorized users.
The operational impact of this vulnerability extends beyond simple information disclosure, as the leaked installation paths can provide attackers with crucial intelligence for planning more sophisticated attacks. Knowledge of the exact file system structure allows adversaries to identify potential weak points in the application architecture, locate configuration files that may contain database credentials, or discover backup files that could contain sensitive data. This information disclosure can enable attackers to perform directory traversal attacks, identify version-specific vulnerabilities, or craft more targeted exploits that leverage the exposed system layout. The vulnerability affects not just the immediate disclosure of paths but also creates opportunities for attackers to map the application's internal structure and identify potential attack vectors that would otherwise remain hidden.
Organizations running affected MediaWiki versions should immediately implement the mitigation strategies recommended by the vendor, which primarily involve disabling the wgShowExceptionDetails variable in production environments and ensuring that all error handling is properly configured to prevent path disclosure. The patch for this vulnerability in version 1.13.3 addresses the root cause by modifying the error reporting mechanism to sanitize output and prevent the inclusion of system paths in error messages. Additionally, security configurations should enforce proper input validation and implement comprehensive error handling that does not expose internal system details. Organizations should also consider implementing web application firewalls that can detect and block requests designed to trigger the vulnerable error conditions, and conduct regular security assessments to ensure that debug settings are properly configured in production environments. The remediation process should include thorough testing to verify that error messages no longer contain sensitive path information while maintaining appropriate logging for legitimate debugging purposes.