CVE-2000-0483 in Zope
Summary
by MITRE
The DocumentTemplate package in Zope 2.2 and earlier allows a remote attacker to modify DTMLDocuments or DTMLMethods without authorization.
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Analysis
by VulDB Data Team • 05/05/2019
The vulnerability identified as CVE-2000-0483 represents a critical authorization bypass flaw within the DocumentTemplate package of Zope 2.2 and earlier versions. This vulnerability specifically affects DTMLDocuments and DTMLMethods which are fundamental components of the Zope content management system used for creating dynamic web applications. The flaw enables remote attackers to manipulate these document objects without proper authentication or authorization, fundamentally compromising the security model of the application server.
The technical implementation of this vulnerability stems from inadequate access control mechanisms within the DocumentTemplate package. DTML (Dynamic Template Markup Language) documents and methods in Zope serve as the primary means for generating dynamic content, making them critical attack vectors when unauthorized modifications are possible. The flaw occurs at the object-level access control, where the system fails to properly validate user permissions before allowing modifications to DTML content. This type of vulnerability maps directly to CWE-284 Access Control Issues, specifically addressing insufficient authorization checks that allow unauthorized users to perform privileged operations.
The operational impact of CVE-2000-0483 extends far beyond simple data modification, as it provides attackers with the ability to alter the core functionality and content of web applications built on Zope. An attacker could potentially inject malicious code into DTML methods, modify existing templates to redirect users to phishing sites, or completely rewrite application logic. This vulnerability effectively undermines the entire security architecture of Zope applications, as DTML objects are often used to implement business logic and user interface components. The remote nature of the attack means that adversaries can exploit this flaw from anywhere on the internet without requiring physical access to the server or prior authentication credentials.
From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1059.007 Command and Scripting Interpreter: Python, as DTML methods often contain Python code execution elements that can be manipulated by attackers. The vulnerability also relates to T1566 Impair Defenses by potentially allowing attackers to modify security-related DTML content or disable protective measures. Organizations running affected Zope versions face significant risk of data compromise, service disruption, and potential complete system takeover. The attack surface is particularly concerning given that Zope was widely used for enterprise web applications, making this vulnerability a prime target for malicious actors seeking to exploit critical business applications.
Mitigation strategies for CVE-2000-0483 require immediate patching of affected Zope installations to versions 2.3 and later where proper authorization controls have been implemented. System administrators should also implement network-level controls such as firewalls to restrict access to Zope administration interfaces, deploy intrusion detection systems to monitor for unauthorized access attempts, and conduct thorough security audits of existing DTML content to identify any potential compromise. Additionally, organizations should consider implementing role-based access controls and regularly review access permissions for DTML objects to ensure that only authorized personnel can modify critical application components. The vulnerability demonstrates the critical importance of proper access control implementation in web application frameworks and serves as a reminder of the potential consequences when authorization mechanisms fail.