CVE-2016-20018 in knex.js
Summary
by MITRE • 12/19/2022
Knex Knex.js through 2.3.0 has a limited SQL injection vulnerability that can be exploited to ignore the WHERE clause of a SQL query.
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Analysis
by VulDB Data Team • 01/15/2023
The vulnerability identified as CVE-2016-20018 affects Knex.js version 2.3.0 and earlier, representing a significant security flaw that undermines database query integrity. This issue stems from insufficient input validation within the query building functionality of the popular JavaScript SQL query builder library. The vulnerability specifically allows attackers to bypass WHERE clause restrictions in SQL queries, effectively undermining the intended access controls and data filtering mechanisms that developers rely upon when constructing database operations through the Knex.js framework.
The technical exploitation of this vulnerability occurs through improper handling of user-supplied input within query construction methods, particularly when developers pass dynamic values into query builders without adequate sanitization. The flaw enables attackers to manipulate SQL query execution paths by injecting malicious input that alters the query structure in ways that circumvent the intended filtering logic. This type of vulnerability falls under the CWE-89 category of SQL Injection, specifically manifesting as a limited variant that targets query construction rather than raw SQL string concatenation. The vulnerability demonstrates how modern ORM and query builder libraries can inadvertently expose applications to injection attacks when they fail to properly validate or escape dynamic parameters.
The operational impact of CVE-2016-20018 extends beyond simple data retrieval manipulation, potentially enabling unauthorized data access, modification, or deletion within affected applications. When exploited, this vulnerability allows attackers to bypass access controls that should restrict query results to specific data sets, potentially exposing sensitive information or enabling privilege escalation attacks. The limited nature of the vulnerability means it primarily affects WHERE clause functionality rather than complete query structure manipulation, but this still represents a substantial security risk in applications that depend on proper query filtering for data protection. Organizations using Knex.js versions prior to 2.3.1 should consider this vulnerability as potentially enabling data breaches through unauthorized query execution paths.
Mitigation strategies for this vulnerability require immediate application updates to Knex.js version 2.3.1 or later, which contains the necessary patches to address the input validation issues. Security teams should also implement comprehensive code reviews focusing on query building patterns to identify potential improper parameter handling within their applications. The remediation process should include thorough testing of all database query operations, particularly those involving dynamic inputs, to ensure that WHERE clause functionality operates as intended. Additionally, organizations should consider implementing additional security controls such as database activity monitoring and query auditing to detect potential exploitation attempts. The vulnerability highlights the importance of proper input validation in modern web application frameworks and demonstrates how even seemingly minor flaws in query builders can have significant security implications. This issue aligns with ATT&CK technique T1071.004 for application layer protocol, specifically targeting database communication channels where improper parameter handling creates attack vectors for data manipulation.