CVE-2006-3852 in Micro GuestBook
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in index.php in Micro GuestBook allows remote attackers to execute arbitrary SQL commands via the (1) name or (2) comment ("text") fields.
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Analysis
by VulDB Data Team • 09/17/2017
The CVE-2006-3852 vulnerability represents a critical cross-site scripting flaw in the Micro GuestBook application's index.php script that enables remote attackers to execute arbitrary SQL commands through malicious input in the name or comment fields. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically targeting input validation and output encoding mechanisms within web applications. The flaw exists due to insufficient sanitization of user-supplied data before processing, creating an avenue for attackers to inject malicious code that can be executed in the context of other users' browsers.
The technical implementation of this vulnerability demonstrates a classic case of improper input handling where the application fails to properly escape or validate user input before incorporating it into dynamic SQL queries or HTML output. When an attacker submits malicious content in either the name or comment fields, the application processes this input without adequate sanitization measures, allowing SQL injection payloads to be executed against the underlying database. This dual nature of the vulnerability means that attackers can simultaneously exploit both the XSS vector for client-side code execution and the SQL injection component for database-level compromise.
From an operational perspective, this vulnerability poses significant risks to web application security and data integrity. The ability to execute arbitrary SQL commands through user input fields creates opportunities for attackers to extract sensitive information, modify database contents, or even escalate privileges within the application environment. The impact extends beyond simple data theft, as attackers could potentially gain persistent access to the database through this vulnerability, leading to comprehensive system compromise. The vulnerability affects the application's authentication and authorization mechanisms by allowing unauthorized access to backend database operations through seemingly benign user interaction points.
The exploitation of this vulnerability aligns with several ATT&CK techniques including T1059.008 for SQL injection and T1566 for credential access through web applications. Organizations should implement comprehensive input validation and output encoding strategies to prevent such vulnerabilities from being exploited in production environments. The recommended mitigations include implementing proper parameterized queries to prevent SQL injection, employing strict input validation with allowlists for all user-supplied data, and implementing Content Security Policy headers to mitigate XSS execution. Additionally, regular security assessments and code reviews should be conducted to identify similar vulnerabilities in legacy applications, as this flaw demonstrates the importance of proper input sanitization in web applications. The vulnerability also highlights the need for security awareness training for developers regarding secure coding practices and the implementation of automated security testing tools during the development lifecycle.