CVE-2006-1683 in Chipmunk Guestbook
Summary
by MITRE
SQL injection vulnerability in admin/login.php in Chipmunk Guestbook allows remote attackers to execute arbitrary SQL commands and bypass login authentication via the User name.
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Analysis
by VulDB Data Team • 08/17/2025
The vulnerability described in CVE-2006-1683 represents a critical sql injection flaw in the Chipmunk Guestbook application's administrative login component. This vulnerability exists in the admin/login.php file where user input validation is insufficient, allowing malicious actors to manipulate the authentication process through crafted sql commands. The specific vector involves the username parameter which is directly incorporated into sql queries without proper sanitization or parameterization. This type of vulnerability falls under the CWE-89 category of sql injection, which is classified as a high-risk security flaw that can lead to complete system compromise. The vulnerability enables remote attackers to bypass authentication mechanisms entirely, providing them with administrative access to the guestbook system.
The technical implementation of this vulnerability stems from the application's failure to properly validate and sanitize user input before incorporating it into database queries. When a user attempts to log in through the admin interface, the username parameter is directly concatenated into sql statements without appropriate escaping or parameter binding mechanisms. This creates an exploitable condition where an attacker can inject malicious sql code through the username field, potentially executing arbitrary commands on the underlying database server. The vulnerability is particularly dangerous because it allows for authentication bypass, meaning attackers can gain administrative privileges without knowing valid credentials, which represents a fundamental breakdown in the application's security architecture.
The operational impact of this vulnerability is severe and multifaceted, as it provides attackers with complete administrative control over the Chipmunk Guestbook system. Once authenticated, attackers can manipulate all guestbook entries, delete content, modify user accounts, and potentially access sensitive data stored within the database. The vulnerability also enables data exfiltration, where attackers can extract confidential information from the database through sql injection techniques. Additionally, the compromised system can be used as a launching point for further attacks within the network, making this vulnerability particularly attractive to threat actors. This type of vulnerability directly maps to attack techniques described in the attack pattern taxonomy under the MITRE ATT&CK framework, specifically relating to credential access and privilege escalation tactics.
Mitigation strategies for this vulnerability require immediate implementation of proper input validation and parameterized queries throughout the application codebase. The most effective remediation involves replacing direct sql query concatenation with prepared statements or parameterized queries that separate user input from sql command structure. Additionally, implementing proper input sanitization techniques, including character escaping and whitelist validation for username fields, would prevent malicious sql code from being executed. Network-level protections such as web application firewalls and intrusion detection systems can provide additional defense in depth, though they should not be considered a replacement for proper code-level fixes. Regular security auditing and code reviews should be implemented to identify similar vulnerabilities in other parts of the application. The remediation process should also include proper error handling that does not expose database information to end users, as this can aid attackers in further exploitation attempts. Organizations should also consider implementing multi-factor authentication and account lockout mechanisms to reduce the effectiveness of brute force attacks targeting this vulnerability.