CVE-2006-5640 in Techno Dreams Guest Book
Summary
by MITRE
SQL injection vulnerability in guestbookview.asp in Techno Dreams Guest Book 1.0 earlier allows remote attackers to execute arbitrary SQL commands via the key parameter.
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Analysis
by VulDB Data Team • 04/26/2026
The vulnerability identified as CVE-2006-5640 represents a critical sql injection flaw in the guestbookview.asp component of Techno Dreams Guest Book version 1.0 and earlier. This vulnerability resides within the parameter handling mechanism where the key parameter is directly incorporated into sql query construction without proper sanitization or input validation. The flaw stems from the application's failure to implement proper input filtering techniques, allowing malicious actors to inject sql commands through crafted input values that are subsequently executed by the database engine. This type of vulnerability falls under the common weakness enumeration category CWE-89, which specifically addresses improper neutralization of special elements used in sql commands.
The operational impact of this vulnerability extends far beyond simple data theft, as remote attackers can leverage the sql injection to execute arbitrary commands on the underlying database system. Successful exploitation enables attackers to retrieve sensitive information, modify or delete database records, and potentially escalate privileges within the database environment. The vulnerability is particularly dangerous because it allows for complete database compromise without requiring authentication, making it an attractive target for automated exploitation tools. Attackers can construct malicious payloads that bypass authentication mechanisms, access confidential user data, and even gain shell access to the underlying server if the database is configured with appropriate privileges.
The technical exploitation of this vulnerability demonstrates a classic sql injection attack vector where the key parameter in guestbookview.asp serves as the primary entry point for malicious input. When an attacker submits a crafted value for the key parameter, the application concatenates this input directly into a sql query string without proper escaping or parameterization. This behavior creates an environment where sql commands can be injected and executed with the privileges of the database user account under which the application operates. The vulnerability aligns with attack techniques documented in the attack pattern taxonomy under the category of sql injection, where attackers manipulate input fields to alter the intended behavior of sql queries.
Mitigation strategies for this vulnerability require immediate implementation of proper input validation and parameterized queries throughout the application codebase. The most effective approach involves replacing direct string concatenation with prepared statements or parameterized queries that separate sql command structure from data values. Organizations should implement input sanitization routines that filter out or escape special sql characters and implement proper access controls to limit database privileges. Additionally, regular security code reviews and penetration testing should be conducted to identify similar vulnerabilities in other components. The remediation process must also include updating the Techno Dreams Guest Book application to a patched version if available, or migrating to a more secure alternative that follows modern security standards and practices.