CVE-2001-0568 in Zope
Summary
by MITRE
Digital Creations Zope 2.3.1 b1 and earlier allows a local attacker (Zope user) with through-the-web scripting capabilities to alter ZClasses class attributes.
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Analysis
by VulDB Data Team • 05/31/2019
The vulnerability identified as CVE-2001-0568 represents a critical security flaw in Digital Creations Zope 2.3.1 beta 1 and earlier versions that exposes the application to unauthorized modification of class attributes through web-based scripting interfaces. This vulnerability specifically targets the Zope Object Database (ZODB) architecture and exploits the insufficient access controls that govern how ZClasses are managed within the system. The issue stems from the fact that authenticated Zope users who possess through-the-web scripting capabilities can manipulate the underlying class definitions, potentially compromising the integrity and security posture of the entire Zope application environment. This represents a significant privilege escalation vulnerability that allows local attackers to modify core application components that should remain protected from user modifications.
The technical flaw manifests in the inadequate validation and access control mechanisms within the Zope web interface that govern class attribute modifications. When users with scripting capabilities access the Zope management interface through web-based tools, they can exploit a weakness in the attribute modification process that permits them to alter ZClasses class attributes directly. This vulnerability operates at the application layer and specifically affects the Zope object model where class definitions are stored and managed. The flaw essentially allows attackers to bypass normal access controls that should prevent modification of core class definitions, enabling them to alter class attributes in ways that could compromise application functionality, data integrity, or security policies. This vulnerability is categorized under CWE-284 Access Control Issues, specifically representing insufficient access control mechanisms that permit unauthorized modifications to protected application components.
The operational impact of this vulnerability extends beyond simple privilege escalation to potentially enable more severe security compromises within Zope environments. An attacker who successfully exploits this vulnerability can modify core class attributes to inject malicious code, alter security policies, or manipulate application behavior in ways that could lead to complete system compromise. The vulnerability particularly affects web applications built on Zope that rely on dynamic class definitions and object management, as it undermines the fundamental security model that should protect class-level modifications from user interference. This could result in persistent backdoors, data corruption, or unauthorized access to sensitive information within applications that depend on Zope's object database architecture. The impact is particularly severe in environments where multiple users have scripting privileges, as the vulnerability could be exploited to compromise the entire application infrastructure.
Mitigation strategies for CVE-2001-0568 should prioritize immediate patching of affected Zope installations to version 2.3.1 final or later, which contains the necessary access control fixes. Organizations should implement strict user privilege management, ensuring that only trusted administrators have through-the-web scripting capabilities, and should regularly audit user permissions within Zope environments. The implementation of proper access control lists and mandatory access controls within the Zope application framework can help prevent unauthorized modifications to class attributes. Additionally, security monitoring should be enhanced to detect unusual modifications to class definitions, and application-level logging should be configured to track all attribute modification activities. Organizations should also consider implementing network segmentation and firewall rules to limit access to Zope management interfaces, particularly those that allow through-the-web scripting capabilities. This vulnerability aligns with ATT&CK technique T1068 Privilege Escalation through unauthorized access control mechanisms, and organizations should ensure their incident response procedures include specific checks for unauthorized class attribute modifications. Regular security assessments and penetration testing of Zope environments should be conducted to identify similar access control weaknesses that could be exploited for similar privilege escalation attacks.