CVE-2006-3799 in DeluxeBB
Summary
by MITRE
DeluxeBB 1.07 and earlier allows remote attackers to bypass SQL injection protection mechanisms via the login variable and certain other variables, by using lowercase "union select" or possibly other statements that do not match the uppercase "UNION SELECT."
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Analysis
by VulDB Data Team • 08/01/2018
The vulnerability described in CVE-2006-3799 represents a critical security flaw in DeluxeBB version 1.07 and earlier systems that undermines fundamental database security protections. This issue affects web applications that implement SQL injection prevention measures, specifically targeting the effectiveness of input sanitization mechanisms. The vulnerability exploits a fundamental weakness in the validation logic that relies on case-sensitive matching to detect and block malicious SQL injection attempts, creating a significant bypass mechanism for attackers seeking to compromise database integrity.
The technical flaw stems from the implementation of SQL injection protection that employs a simple string matching approach against uppercase "UNION SELECT" patterns. This protection mechanism fails to account for case variations in SQL keywords, allowing attackers to craft malicious payloads using lowercase "union select" syntax that successfully evades detection. The vulnerability specifically targets the login variable and other input parameters, demonstrating how incomplete input validation can create exploitable gaps in security architecture. This type of flaw falls under the category of CWE-1004 which describes insecure coding practices related to insufficient input validation and improper sanitization mechanisms.
The operational impact of this vulnerability extends beyond simple data theft, as it provides attackers with potential access to sensitive user information, session data, and database contents. Successful exploitation could enable unauthorized database access, data manipulation, and potentially full system compromise depending on the database permissions and underlying infrastructure. Attackers can leverage this vulnerability to perform unauthorized database queries, extract user credentials, and potentially escalate privileges within the affected system. The bypass mechanism specifically targets the application's attempt to filter malicious SQL syntax, effectively neutralizing the intended protection measures.
Organizations should implement comprehensive input validation that accounts for case variations and employs more robust sanitization techniques to prevent such bypasses. The recommended mitigation strategies include implementing case-insensitive pattern matching, employing parameterized queries, and utilizing more sophisticated input filtering mechanisms that do not rely on simple string matching approaches. Security measures should also incorporate regular security testing and code reviews to identify similar vulnerabilities in input validation logic. This vulnerability demonstrates the importance of considering all possible variations of malicious input patterns and highlights the need for comprehensive security testing that includes case sensitivity analysis. The issue aligns with ATT&CK technique T1071.004 which covers application layer protocol manipulation, and specifically addresses the weakness in input validation controls that allows for protocol-level attacks against database systems.