CVE-2021-36722 in eNvoice
Summary
by MITRE • 12/29/2021
Emuse - eServices / eNvoice SQL injection can be used in various ways ranging from bypassing login authentication or dumping the whole database to full RCE on the affected endpoints. The SQLi caused by CWE-209: Generation of Error Message Containig Sensetive Information, showing parts of the aspx code and the webroot location , information an attacker can leverage to further compromise the host.
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Analysis
by VulDB Data Team • 12/31/2021
The vulnerability identified as CVE-2021-36722 affects the Emuse eServices and eNvoice platforms, representing a critical SQL injection flaw that exposes organizations to severe operational risks. This vulnerability stems from CWE-209, which specifically addresses the generation of error messages containing sensitive information, creating a dangerous feedback loop that empowers attackers to extract valuable system data. The flaw manifests when the application fails to properly sanitize user inputs before processing them in database queries, allowing malicious actors to inject SQL commands that can manipulate the underlying database structure.
The technical implementation of this vulnerability enables attackers to leverage multiple attack vectors ranging from simple authentication bypass to complete system compromise. When an attacker submits malicious input through the application's interface, the system processes this input without adequate sanitization, resulting in error messages that inadvertently disclose sensitive information including parts of the aspx code and the webroot location. This information disclosure represents a critical weakness that directly aligns with the ATT&CK framework's T1083 (File and Directory Discovery) and T1059 (Command and Scripting Interpreter) techniques, as attackers can use the exposed paths to navigate the file system and potentially execute commands.
The operational impact of this vulnerability extends far beyond simple data theft, as it provides attackers with a pathway to achieve full remote code execution on the affected endpoints. Once an attacker has obtained the webroot location and understands the application's code structure, they can craft sophisticated attack payloads that exploit the SQL injection to execute arbitrary code on the server. This progression from SQL injection to RCE demonstrates the severity of the flaw and its potential to cause complete system compromise, making it a prime target for advanced persistent threats. The vulnerability's ability to bypass authentication mechanisms further compounds the risk, as attackers can gain unauthorized access to sensitive business data and system resources without proper authorization.
Organizations affected by this vulnerability should implement immediate mitigations including comprehensive input validation, parameterized queries, and robust error handling that prevents sensitive information disclosure. The implementation of web application firewalls and regular security testing can help detect and prevent exploitation attempts. Additionally, following the principle of least privilege and implementing proper access controls will limit the potential damage from successful exploitation attempts. Security teams should also consider deploying intrusion detection systems that monitor for unusual database access patterns and error message generation that could indicate exploitation attempts. The vulnerability serves as a stark reminder of the importance of proper error handling and input validation in web applications, particularly those handling sensitive business data and financial transactions.