CVE-2006-4592 in Simple Blog
Summary
by MITRE
Incomplete blacklist vulnerability in default.asp in 8pixel.net Simple Blog 2.3 and earlier allows remote attackers to conduct SQL injection attacks via ">" characters in the id parameter, which are not filtered by the protection mechanism.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 07/17/2024
The vulnerability identified as CVE-2006-4592 represents a critical security flaw in the 8pixel.net Simple Blog version 2.3 and earlier, specifically within the default.asp script. This issue stems from an incomplete blacklist implementation that fails to properly filter certain characters, creating a significant attack vector for malicious actors. The vulnerability manifests when the application processes user input through the id parameter, where the presence of ">" characters is not adequately sanitized or blocked by the existing protection mechanisms.
This incomplete blacklist vulnerability falls under the CWE-94 category of Code Injection, more specifically CWE-917 which addresses Improper Neutralization of Special Elements used in an SQL Command. The flaw occurs because the application's input validation logic does not account for all potentially dangerous characters that could be used to manipulate SQL queries. The ">" character serves as a crucial bypass mechanism in this case, allowing attackers to craft SQL injection payloads that would otherwise be blocked by more comprehensive filtering systems. The vulnerability demonstrates a fundamental weakness in the application's security architecture where the protection mechanism is not robust enough to handle all possible injection vectors.
The operational impact of this vulnerability is severe as it enables remote attackers to execute arbitrary SQL commands against the underlying database system. Attackers can leverage this weakness to extract sensitive information, modify database records, or even gain unauthorized access to the entire database infrastructure. The vulnerability's exploitation requires minimal effort since the attacker only needs to include the ">" character in the id parameter to bypass the filtering mechanism. This makes the vulnerability particularly dangerous as it can be exploited by attackers with basic technical knowledge and does not require complex payload construction or advanced exploitation techniques.
The security implications extend beyond simple data theft, as this vulnerability could enable full system compromise through database-level attacks. An attacker could potentially escalate privileges, access administrative functions, or even use the compromised database as a staging ground for further attacks within the network. The vulnerability's presence in a widely used blogging platform increases its potential impact, as many organizations rely on such systems for content management and user interaction. The attack vector is particularly concerning because it operates through standard HTTP GET requests, making detection more difficult and allowing for automated exploitation tools to target vulnerable systems.
Mitigation strategies should focus on implementing comprehensive input validation and output encoding mechanisms. Organizations should employ allowlists rather than incomplete blacklists for character filtering, ensuring that only expected and safe input patterns are accepted. The implementation of proper parameterized queries and prepared statements would eliminate the possibility of SQL injection regardless of input filtering failures. Additionally, regular security audits and penetration testing should be conducted to identify similar vulnerabilities in legacy applications. The use of web application firewalls and intrusion detection systems can provide additional layers of protection, though these should not be relied upon as the sole defense mechanism. This vulnerability underscores the importance of following secure coding practices and the necessity of comprehensive security testing throughout the software development lifecycle to prevent such critical flaws from reaching production environments.