CVE-2007-2093 in Guestbook
Summary
by MITRE
Direct static code injection vulnerability in index.php in Limesoft Guestbook (LS Simple Guestbook) 1.0 allows remote attackers to inject arbitrary PHP code into posts.txt via the message parameter.
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Analysis
by VulDB Data Team • 09/05/2024
The CVE-2007-2093 vulnerability represents a critical direct static code injection flaw within the Limesoft Guestbook version 1.0, specifically affecting the index.php script. This vulnerability arises from inadequate input validation and sanitization mechanisms that fail to properly filter user-supplied data before processing. The flaw exists in the message parameter handling where the application directly incorporates user input into the posts.txt file without appropriate security measures, creating an environment where malicious actors can execute arbitrary PHP code through guestbook entries.
This vulnerability falls under the CWE-94 category of "Improper Control of Generation of Code" and more specifically maps to CWE-95 which addresses "Improper Neutralization of Directives in Dynamically-Generated Code." The attack vector enables remote code execution through a simple injection technique where an attacker crafts malicious PHP code within the message parameter and submits it through the guestbook interface. When the vulnerable application processes this input and writes it to the posts.txt file, the injected code becomes executable within the web server context.
The operational impact of this vulnerability is severe as it provides attackers with full control over the affected web server running the vulnerable guestbook application. An attacker can execute arbitrary commands, upload additional malware, steal sensitive data, or use the compromised system as a pivot point for further attacks within the network infrastructure. The vulnerability affects the confidentiality, integrity, and availability of the web application and underlying system resources, potentially leading to complete system compromise and data breaches. The attack requires no special privileges beyond basic web access and can be executed through standard web browser interactions.
Security mitigations for this vulnerability include immediate implementation of input validation and sanitization measures that filter or escape all user-supplied data before processing. The application should employ proper output encoding techniques to prevent code injection attacks, implement whitelisting of acceptable characters, and utilize secure coding practices that avoid direct code generation from user input. Organizations should also consider implementing web application firewalls to detect and block suspicious input patterns, conduct regular security audits of web applications, and ensure all software components are updated to the latest secure versions. The vulnerability demonstrates the critical importance of following secure coding guidelines and implementing defense-in-depth strategies as outlined in the MITRE ATT&CK framework under the technique T1059.007 for "Command and Scripting Interpreter: PowerShell" and similar execution techniques that leverage code injection vulnerabilities.