CVE-2009-4805 in EZ-Blog
Summary
by MITRE
Multiple SQL injection vulnerabilities in EZ-Blog Beta 1, when magic_quotes_gpc is disabled, allow remote attackers to execute arbitrary SQL commands via (1) the storyid parameter to public/view.php or (2) the kill parameter to admin/remove.php.
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Analysis
by VulDB Data Team • 11/24/2024
The vulnerability identified as CVE-2009-4805 represents a critical security flaw in EZ-Blog Beta 1 software that stems from improper input validation and sanitization practices. This issue manifests as multiple SQL injection vulnerabilities that specifically target the blog's public and administrative interfaces, creating a pathway for remote attackers to manipulate the underlying database system. The vulnerability's exploitation potential is significantly amplified when the PHP configuration parameter magic_quotes_gpc is disabled, which removes the automatic escaping of special characters that would otherwise provide basic protection against such attacks. The affected components include the public/view.php script that handles storyid parameter inputs and the admin/remove.php script that processes kill parameter inputs, both of which fail to properly sanitize user-supplied data before incorporating it into SQL queries.
The technical implementation of this vulnerability follows the classic SQL injection pattern where attacker-controlled data is directly concatenated into SQL command strings without adequate validation or escaping mechanisms. When magic_quotes_gpc is disabled, the application becomes particularly susceptible because it no longer receives automatic protection against special SQL characters that could be used to alter the intended query structure. Attackers can manipulate the storyid parameter in public/view.php to inject malicious SQL code that executes within the database context, potentially allowing them to extract sensitive information, modify database records, or even gain elevated privileges within the system. Similarly, the kill parameter in admin/remove.php presents an administrative attack vector that could enable unauthorized users to delete content or perform other destructive operations through carefully crafted SQL injection payloads.
The operational impact of this vulnerability extends beyond simple data compromise, as it provides attackers with persistent access to the database backend that could be leveraged for extended attacks. The vulnerability affects both public-facing and administrative interfaces, creating a comprehensive attack surface that could allow an attacker to first gain read access to published content through the public interface and then potentially escalate privileges to administrative functions via the admin interface. This dual attack vector significantly increases the potential damage scope and makes the vulnerability particularly dangerous for blog administrators who may not immediately realize the extent of compromise possible through either interface. The vulnerability also demonstrates poor security hygiene in the application's architecture, as it fails to implement proper input validation and parameterized queries that would prevent such injection attacks regardless of PHP configuration settings.
Security mitigations for this vulnerability should focus on implementing proper input validation and sanitization mechanisms throughout the application code. The most effective immediate fix involves implementing parameterized queries or prepared statements that separate SQL command structure from user data, ensuring that even malformed inputs cannot alter the intended query execution. Additionally, the application should validate and sanitize all user inputs, particularly those used in database queries, using strict type checking and whitelisting approaches. The system should also enforce proper access controls and authentication mechanisms to limit administrative functions to authorized personnel only. Organizations should consider implementing web application firewalls that can detect and block common SQL injection patterns, though this should not replace proper code-level fixes. From a compliance perspective, this vulnerability aligns with CWE-89 which specifically addresses SQL injection flaws, and it maps to ATT&CK technique T1190 for exploitation of remote services and T1078 for valid accounts usage, highlighting the need for both defensive and detection measures to address the full attack surface.
The vulnerability serves as a critical reminder of the importance of secure coding practices and the dangers of relying on server configuration settings for security protection. Modern security frameworks emphasize that applications should be designed to be secure by default, regardless of environmental configurations, making this type of vulnerability particularly concerning for legacy systems. The issue also underscores the necessity of comprehensive security testing including dynamic and static analysis, as well as regular security audits to identify and remediate such flaws before they can be exploited by malicious actors in the wild.