CVE-2021-43700 in ApiManager
Summary
by MITRE • 03/24/2022
An issue was discovered in ApiManager 1.1. there is sql injection vulnerability that can use in /index.php?act=api&tag=8.
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Analysis
by VulDB Data Team • 03/27/2022
The vulnerability identified as CVE-2021-43700 represents a critical sql injection flaw within ApiManager version 1.1 that specifically affects the application's handling of user input through the /index.php?act=api&tag=8 endpoint. This vulnerability stems from insufficient input validation and improper parameter handling within the application's api module, creating a pathway for malicious actors to execute arbitrary sql commands against the underlying database. The issue manifests when the application processes the tag parameter without adequate sanitization, allowing attackers to manipulate the sql query execution flow through crafted input sequences.
The technical exploitation of this vulnerability occurs through the targeted endpoint where the tag parameter is directly incorporated into sql query construction without proper escaping or parameterization. This design flaw aligns with CWE-89 which specifically addresses sql injection vulnerabilities resulting from inadequate input validation and improper query construction practices. Attackers can leverage this weakness to perform unauthorized database operations including data extraction, modification, or deletion, potentially leading to complete system compromise. The vulnerability's impact is amplified by the fact that it operates through a publicly accessible api endpoint, making it readily exploitable without requiring elevated privileges or specialized access.
From an operational standpoint, this sql injection vulnerability presents significant risks to organizations relying on ApiManager 1.1 for their api management needs. The exposure of sensitive data through unauthorized database access could result in data breaches, regulatory compliance violations, and substantial financial losses. The attack surface extends beyond simple data theft to include potential system lateral movement and privilege escalation opportunities. Security frameworks such as ATT&CK's T1071.004 technique for application layer protocol manipulation further support the classification of this vulnerability as a critical entry point for advanced persistent threats.
Mitigation strategies for CVE-2021-43700 should prioritize immediate implementation of parameterized queries and input validation mechanisms throughout the api module. Organizations must ensure that all user-supplied parameters, particularly those used in sql query construction, undergo rigorous sanitization and validation processes. The recommended approach involves transitioning from dynamic sql query building to prepared statements with parameter binding, which directly addresses the root cause identified in CWE-89. Additionally, implementing proper access controls and input filtering at the application level, along with regular security audits of api endpoints, will significantly reduce the risk of exploitation. Organizations should also consider network-level protections such as web application firewalls and intrusion detection systems to monitor and block suspicious sql injection attempts targeting the affected endpoint.