CVE-2009-2034 in Yogurt
Summary
by MITRE
SQL injection vulnerability in writemessage.php in Yogurt 0.3, when register_globals is enabled, allows remote authenticated users to execute arbitrary SQL commands via the original parameter.
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Analysis
by VulDB Data Team • 12/01/2024
The vulnerability identified as CVE-2009-2034 represents a critical SQL injection flaw within the Yogurt 0.3 web application, specifically in the writemessage.php component. This vulnerability manifests when the PHP configuration parameter register_globals is enabled, creating a dangerous condition where user-supplied input can directly influence the execution of database queries. The affected parameter named original in the writemessage.php script becomes a vector for malicious input manipulation, allowing authenticated users to craft SQL commands that bypass normal application security measures and execute arbitrary database operations. This type of vulnerability falls under the CWE-89 category, which specifically addresses SQL injection vulnerabilities where untrusted data is incorporated into SQL query construction without proper sanitization or parameterization.
The operational impact of this vulnerability extends beyond simple data theft or modification, as it provides attackers with the ability to perform complete database compromise operations. Authenticated users can leverage this flaw to execute unauthorized database commands including but not limited to data extraction, insertion, update, or deletion operations. The vulnerability is particularly concerning because it operates within the context of an already authenticated session, meaning attackers do not need to perform additional authentication attempts to exploit the flaw. This characteristic aligns with the ATT&CK technique T1078 which covers valid accounts as a means of gaining access, and T1046 which involves remote service exploitation. The use of register_globals creates a dangerous precedent where application developers must assume that all GET, POST, and COOKIE parameters are directly accessible within the global namespace, fundamentally undermining proper input validation practices.
The technical exploitation of this vulnerability requires an attacker to be authenticated to the Yogurt application, which reduces the initial attack surface but does not eliminate the severity of the flaw. When register_globals is enabled, any parameter passed to the script becomes automatically available as a global variable, eliminating the need for explicit variable assignment and creating numerous opportunities for injection attacks. The original parameter in writemessage.php becomes particularly dangerous as it likely represents user-generated content that should be properly sanitized before database insertion. This vulnerability demonstrates the critical importance of proper input validation and the dangers of legacy PHP configurations that enable potentially hazardous features. Organizations should note that this vulnerability is particularly relevant in environments where older PHP versions or legacy configurations are maintained, as register_globals was deprecated in PHP 4.2.0 and removed entirely in PHP 5.4.0, making such configurations increasingly rare but still present in legacy systems.
Mitigation strategies for CVE-2009-2034 must address both the immediate exploitation vector and the underlying architectural issues that enable such vulnerabilities. The primary recommendation involves disabling register_globals in all PHP configurations, which immediately eliminates the root cause of the vulnerability. Additionally, implementing proper parameterized queries or prepared statements in the writemessage.php script ensures that user input cannot influence SQL command structure regardless of global variable exposure. Input validation and sanitization should be implemented at multiple layers, including application-level filtering and database-level protection mechanisms. The implementation of proper access controls and least privilege principles can help limit the potential damage from successful exploitation. Security monitoring should include detection of unusual database query patterns and unauthorized data manipulation activities, which could indicate exploitation attempts. Organizations should also conduct comprehensive code reviews to identify similar vulnerabilities in other components and ensure that all database interactions follow secure coding practices. This vulnerability highlights the importance of maintaining up-to-date security configurations and avoiding deprecated PHP features that create inherent security risks. The remediation process should include thorough testing to ensure that the application functions correctly after implementing these security measures while maintaining all intended functionality.