CVE-2007-1998 in Guest Book
Summary
by MITRE
Direct static code injection vulnerability in HIOX Guest Book (HGB) 4.0 allows remote attackers to inject arbitrary PHP code via the Email field, which results in code execution through a direct request to gb.php.
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Analysis
by VulDB Data Team • 09/04/2024
The CVE-2007-1998 vulnerability represents a critical direct static code injection flaw in HIOX Guest Book version 4.0, a web application designed for managing guest book entries. This vulnerability resides within the application's input validation mechanisms, specifically targeting the Email field parameter that is processed without proper sanitization or encoding. The flaw enables remote attackers to execute arbitrary PHP code on the target server by manipulating the Email field in guest book submissions, effectively bypassing the application's intended security controls. The vulnerability's classification as a direct static code injection aligns with CWE-94, which describes the improper execution of code due to the inclusion of untrusted data in executable code contexts.
The technical exploitation of this vulnerability occurs through a carefully crafted payload injected into the Email field of guest book entries. When the application processes this input and subsequently includes it in a PHP execution context within gb.php, the malicious code becomes executable within the web server's environment. This direct code execution capability stems from the application's failure to properly validate or sanitize user-supplied input before incorporating it into dynamic PHP code execution paths. The vulnerability demonstrates a classic lack of input sanitization and output encoding practices that are fundamental to preventing code injection attacks in web applications.
The operational impact of CVE-2007-1998 extends beyond simple code execution to encompass complete system compromise and potential data exfiltration. An attacker who successfully exploits this vulnerability can execute arbitrary commands on the web server, potentially leading to unauthorized access to sensitive data, modification of the guest book content, or even complete server takeover. The remote nature of the attack means that exploitation does not require physical access to the system, making it particularly dangerous for web applications that are publicly accessible. This vulnerability essentially transforms the guest book functionality into a backdoor mechanism for remote code execution, enabling attackers to establish persistent access and conduct further reconnaissance or malicious activities.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term architectural improvements to prevent similar issues. The primary fix involves implementing proper input validation and sanitization techniques, ensuring that all user-supplied data is properly escaped or encoded before being processed or stored in the application. This includes implementing proper output encoding when displaying user input and avoiding direct code execution of user-provided content. Organizations should also consider implementing web application firewalls and input validation rules to detect and block suspicious payloads. The vulnerability highlights the importance of following secure coding practices and adheres to ATT&CK technique T1059.007 for Command and Scripting Interpreter: PHP, emphasizing the need for proper code validation and input sanitization to prevent arbitrary code execution. Additionally, regular security assessments and code reviews should be conducted to identify similar vulnerabilities in other web applications and ensure compliance with security standards such as OWASP Top Ten and NIST Cybersecurity Framework.