CVE-2006-0861 in Guestbox
Summary
by MITRE
Michael Salzer Guestbox 0.6, and other versoins before 0.8, allows remote attackers to obtain the source IP addresses of guestbook entries via a direct request to /gb/gblog.
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Analysis
by VulDB Data Team • 07/19/2018
The vulnerability identified as CVE-2006-0861 affects Michael Salzer Guestbook version 0.6 and earlier versions before 0.8, representing a significant information disclosure flaw that exposes source IP addresses of guestbook entries to remote attackers. This vulnerability stems from inadequate input validation and improper access controls within the guestbook application's implementation. The flaw specifically manifests when attackers can directly request the /gb/gblog endpoint, which bypasses normal access controls and reveals sensitive information that should remain protected from unauthorized access.
The technical implementation of this vulnerability involves a lack of proper authentication checks and access control mechanisms within the guestbook application. When a remote attacker sends a direct request to the /gb/gblog path, the application fails to verify whether the requester has legitimate authorization to access the guestbook entries. This represents a classic case of insufficient access control as classified under CWE-284, where improper access control allows unauthorized users to access restricted resources. The vulnerability demonstrates poor input sanitization and validation practices, as the application does not properly filter or validate incoming requests before processing them.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with valuable reconnaissance data including source IP addresses of users who have submitted entries. This information can be leveraged for further attacks including targeted social engineering, network mapping, or coordinated attacks against specific users. The exposure of IP addresses creates potential for attackers to identify patterns in user behavior, target specific geographic regions, or conduct more sophisticated attacks such as IP-based enumeration or scanning. From an attacker's perspective, this vulnerability aligns with ATT&CK technique T1083 (File and Directory Discovery) and T1592 (Inventory of Vulnerable Targets) as it enables systematic reconnaissance of the application's user base.
The security implications of this vulnerability are particularly concerning in environments where guestbook applications serve as public-facing interfaces. Attackers can exploit this flaw to build comprehensive profiles of users interacting with the guestbook, potentially identifying high-value targets or creating attack vectors for more sophisticated compromises. The vulnerability also demonstrates poor security architecture principles, as it fails to implement proper request validation and access control mechanisms that would normally be expected in secure web applications. Organizations running affected versions should immediately implement mitigations including access control restrictions, input validation enhancements, and application-level security hardening measures. The vulnerability serves as a reminder of the critical importance of proper access control implementation and input validation in preventing information disclosure attacks that can significantly compromise system security posture.