CVE-2017-11329 in GLPI
Summary
by MITRE
GLPI before 9.1.5 allows SQL injection via an ajax/getDropdownValue.php request with an entity_restrict parameter that is not a list of integers.
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Analysis
by VulDB Data Team • 12/12/2022
The vulnerability identified as CVE-2017-11329 affects GLPI versions prior to 9.1.5 and represents a critical SQL injection flaw within the ajax/getDropdownValue.php endpoint. This issue arises from inadequate input validation when processing the entity_restrict parameter, which should theoretically contain a list of integers representing entity identifiers within the GLPI system. The flaw allows malicious actors to inject arbitrary SQL commands through crafted requests that manipulate this parameter, potentially leading to unauthorized data access, modification, or deletion within the affected system.
The technical implementation of this vulnerability stems from the application's failure to properly sanitize user-supplied input before incorporating it into SQL query constructions. When the entity_restrict parameter is processed, the application does not validate that the input consists exclusively of integer values or properly escape special characters that could alter the intended SQL structure. This weakness falls under the Common Weakness Enumeration category CWE-89, which specifically addresses SQL injection vulnerabilities where untrusted data is directly embedded into SQL commands without proper sanitization or parameterization. The vulnerability is particularly dangerous because it occurs within an AJAX endpoint designed for dynamic data retrieval, making it accessible through normal web application interactions.
The operational impact of this vulnerability extends beyond simple data theft, as successful exploitation could enable attackers to gain deeper access to the GLPI infrastructure. An attacker could potentially extract sensitive information including user credentials, system configurations, and organizational data stored within the GLPI database. The vulnerability's accessibility through the ajax endpoint means that exploitation could occur through standard web browser interactions without requiring specialized tools or extensive network reconnaissance. This makes the attack surface significantly larger and the risk more pronounced for organizations relying on GLPI for IT asset management, help desk operations, and system administration tasks.
Organizations utilizing GLPI versions prior to 9.1.5 should implement immediate mitigations including updating to the patched version 9.1.5 or later, which includes proper input validation and sanitization for the entity_restrict parameter. Network-based mitigations such as web application firewalls can provide additional protection by filtering suspicious SQL injection patterns in incoming requests. The implementation of proper input validation techniques, including parameterized queries and strict type checking for integer parameters, should be enforced throughout the application codebase. Security monitoring should be enhanced to detect unusual patterns in AJAX endpoint usage that might indicate exploitation attempts, while regular security assessments should verify that similar input validation gaps do not exist in other parts of the GLPI application or related systems. This vulnerability demonstrates the critical importance of input validation in web applications and aligns with ATT&CK technique T1071.004 for application layer protocol manipulation, where adversaries exploit application-specific vulnerabilities to achieve unauthorized access.