CVE-2019-7726 in Nukeviet
Summary
by MITRE • 12/31/2020
modules/banners/funcs/click.php in NukeViet before 4.3.04 has a SQL INSERT statement with raw header data from an HTTP request (e.g., Referer and User-Agent).
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Analysis
by VulDB Data Team • 12/31/2020
The vulnerability exists within the NukeViet content management system where the file modules/banners/funcs/click.php processes HTTP request headers without proper sanitization or parameterization. This flaw allows attackers to inject malicious SQL commands through headers such as Referer and User-Agent that are directly incorporated into SQL INSERT statements. The vulnerability represents a classic sql injection weakness that can be exploited by remote attackers to manipulate database operations and potentially gain unauthorized access to sensitive information.
This vulnerability falls under the CWE-89 category of SQL Injection, specifically manifesting as an improper neutralization of special elements used in an SQL command. The attack vector leverages the fact that raw header data is directly concatenated into SQL queries without any form of input validation or escaping mechanisms. The lack of parameterized queries or prepared statements creates an environment where malicious actors can craft headers that contain SQL payload sequences designed to alter the intended database behavior.
The operational impact of this vulnerability extends beyond simple data manipulation as it can enable attackers to extract confidential information from the database, modify existing records, or even delete critical data. Since the vulnerability affects the banner click tracking functionality, an attacker could potentially use this to harvest user information, manipulate advertising metrics, or gain persistence within the system. The remote nature of the attack means that exploitation does not require local system access, making it particularly dangerous for publicly accessible web applications.
Security mitigations should focus on implementing proper input sanitization and parameterized queries throughout the affected codebase. All HTTP header data must be properly escaped or validated before being incorporated into database operations. The recommended approach involves using prepared statements with bound parameters, which separates the SQL command structure from the data being inserted. Additionally, implementing proper access controls and input validation at the application level can help prevent malicious header data from reaching the database layer. Organizations should also consider implementing web application firewalls and regular security scanning to detect and prevent exploitation attempts targeting this class of vulnerability.