CVE-2013-3536 in Group Pay
Summary
by MITRE
SQL injection vulnerability in the gp_LoadUserFromHash function in functions_hash.php in the Group Pay module 1.5 and earlier for WHMCS allows remote attackers to execute arbitrary SQL commands via the hash parameter.
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Analysis
by VulDB Data Team • 03/01/2025
The CVE-2013-3536 vulnerability represents a critical sql injection flaw within the Group Pay module for WHMCS version 1.5 and earlier. This vulnerability specifically targets the gp_LoadUserFromHash function located in the functions_hash.php file, creating a significant security risk for affected systems. The flaw enables remote attackers to manipulate the hash parameter and execute arbitrary sql commands against the underlying database, potentially compromising the entire system infrastructure.
The technical implementation of this vulnerability stems from inadequate input validation and sanitization within the gp_LoadUserFromHash function. When the hash parameter is processed, the application fails to properly escape or filter user-supplied input before incorporating it into sql queries. This allows malicious actors to inject sql payload through the hash parameter, bypassing normal authentication mechanisms and gaining unauthorized access to database resources. The vulnerability operates at the application layer and can be exploited remotely without requiring authentication, making it particularly dangerous for web-based hosting management platforms.
The operational impact of this vulnerability extends beyond simple data theft, as it can enable complete system compromise. Attackers can leverage this sql injection to extract sensitive user information, modify database records, escalate privileges, or even execute system commands on the underlying server. In the context of WHMCS, which manages hosting services and billing information, this vulnerability could result in unauthorized access to customer billing data, service accounts, and potentially the entire hosting infrastructure. The Group Pay module's integration with core WHMCS functionality amplifies the potential damage, as successful exploitation could affect multiple system components.
Organizations affected by this vulnerability should immediately implement mitigations including input validation, parameterized queries, and access controls. The recommended approach involves updating to WHMCS version 1.5 or later where this vulnerability has been patched, implementing proper input sanitization for all user-supplied parameters, and applying web application firewalls to monitor and block suspicious sql injection attempts. From a cybersecurity perspective, this vulnerability aligns with CWE-89 sql injection and follows ATT&CK technique T1190 for exploitation of remote services, demonstrating how poorly secured authentication modules can serve as entry points for broader system compromise. The vulnerability also highlights the importance of regular security assessments and timely patch management in preventing exploitation of known security flaws.