CVE-2006-1386 in TWiki
Summary
by MITRE
The (1) rdiff and (2) preview scripts in TWiki 4.0 and 4.0.1 ignore access control settings, which allows remote attackers to read restricted areas and access restricted content in TWiki topics.
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Analysis
by VulDB Data Team • 07/21/2018
The vulnerability identified as CVE-2006-1386 represents a critical access control bypass flaw in TWiki version 4.0 and 4.0.1. This security weakness affects two specific scripts within the TWiki web application framework namely the rdiff script responsible for displaying revision differences and the preview script used for content preview functionality. Both scripts fail to properly validate user permissions and authentication status before granting access to restricted content, creating a significant security gap that undermines the application's core access control mechanisms.
The technical implementation of this vulnerability stems from inadequate input validation and permission checking within the affected scripts. When users attempt to access restricted TWiki topics through either the rdiff or preview functionality, the scripts do not properly verify whether the requesting user possesses the necessary authorization levels to view the content. This flaw allows unauthenticated or unauthorized users to bypass the normal access control enforcement mechanisms that should prevent access to protected topics. The vulnerability manifests as a failure in the application's authorization logic where the scripts operate without proper context validation, effectively rendering the access control settings configurable through TWiki's security framework meaningless.
From an operational impact perspective, this vulnerability creates substantial risk for organizations relying on TWiki for collaborative content management and document sharing. Remote attackers can exploit this weakness to gain unauthorized access to confidential information stored within TWiki repositories, potentially including sensitive business documents, proprietary data, or personal information. The attack surface is particularly concerning because it affects core functionality scripts that are commonly accessed during normal user operations, making exploitation both feasible and difficult to detect. The vulnerability essentially allows for information disclosure at scale, as attackers can systematically access multiple restricted topics without requiring legitimate credentials.
This vulnerability aligns with CWE-284, which addresses improper access control issues in software applications. The flaw demonstrates a classic case of insufficient authorization checking where the application fails to properly enforce access restrictions. From an adversarial perspective, this vulnerability maps to ATT&CK technique T1213.002 which covers data from information repositories, as attackers can systematically extract restricted content from the TWiki system. The lack of proper access control validation creates a persistent security weakness that can be exploited repeatedly without requiring additional authentication credentials or complex attack vectors.
The recommended mitigation strategies for this vulnerability involve immediate implementation of security patches provided by TWiki developers, as well as comprehensive code review to ensure proper access control validation is implemented throughout the application. Organizations should also consider implementing network-level access controls and monitoring for unusual access patterns that might indicate exploitation attempts. Additionally, regular security assessments should verify that access control mechanisms function correctly and that no similar flaws exist in other application components. The vulnerability serves as a reminder of the critical importance of proper authorization checking in web applications and the potential consequences when such controls are inadequately implemented.