CVE-2018-18075 in Wikidforum
Summary
by MITRE
WikidForum 2.20 has SQL Injection via the rpc.php parent_post_id or num_records parameter, or the index.php?action=search select_sort parameter.
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Analysis
by VulDB Data Team • 04/01/2020
WikidForum 2.20 contains a critical sql injection vulnerability that affects multiple parameters across different script files, representing a significant security weakness in the application's input validation mechanisms. This vulnerability resides in the rpc.php script where the parent_post_id and num_records parameters are not properly sanitized before being incorporated into sql queries, and additionally in index.php where the action=search select_sort parameter lacks adequate input filtering. The flaw allows attackers to manipulate database queries through maliciously crafted input, potentially enabling unauthorized access to sensitive data, data manipulation, or even complete database compromise.
The technical implementation of this vulnerability stems from the application's failure to employ proper parameterized queries or input sanitization techniques when processing user-supplied data. When the rpc.php script processes the parent_post_id or num_records parameters, it directly incorporates these values into sql statements without proper escaping or validation, creating an entry point for malicious sql commands. Similarly, the index.php script's handling of the select_sort parameter during search operations demonstrates a lack of proper input validation that allows attackers to inject sql syntax. This type of vulnerability falls under the common weakness enumeration CWE-89 which specifically addresses sql injection flaws, and aligns with attack patterns documented in the attack tree framework where adversaries exploit insufficient input validation to execute unauthorized database operations.
The operational impact of this vulnerability extends beyond simple data theft to encompass potential system compromise and data integrity violations. An attacker could exploit these parameters to extract confidential information from the database including user credentials, personal data, or application configuration details. The vulnerability's scope is particularly concerning as it affects core forum functionality parameters that are frequently accessed during normal user operations, making exploitation relatively straightforward. Additionally, the attack surface is broadened by the presence of the vulnerability in multiple files, increasing the likelihood of successful exploitation across different user interaction scenarios.
Security mitigation strategies for this vulnerability should prioritize immediate implementation of proper input validation and parameterized query usage throughout the application codebase. The recommended approach involves enforcing strict input sanitization on all user-supplied parameters, implementing proper prepared statements with parameter binding, and establishing comprehensive input validation routines that reject or sanitize malicious input patterns. Organizations should also consider implementing web application firewalls to detect and block sql injection attempts, while maintaining regular security assessments to identify similar vulnerabilities in other application components. The remediation process must address all affected parameters across both rpc.php and index.php files, ensuring that the fix aligns with secure coding practices established by industry standards such as the owasp top ten and the iso/iec 27001 information security framework.