CVE-2020-4202 in UrbanCode Deploy
Summary
by MITRE
IBM UrbanCode Deploy (UCD) 7.0.3.0 and 7.0.4.0 could allow an authenticated user to impersonate another user if the server is configured to enable Distributed Front End (DFE). IBM X-Force ID: 174955.
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Analysis
by VulDB Data Team • 06/02/2024
IBM UrbanCode Deploy versions 7.0.3.0 and 7.0.4.0 contain a critical authentication bypass vulnerability that enables authenticated users to impersonate other users when the Distributed Front End configuration is enabled. This vulnerability stems from insufficient session management and authorization controls within the application's user authentication framework. The flaw specifically affects systems where the Distributed Front End feature is activated, creating a path for privilege escalation through improper user context handling during distributed operations. The vulnerability manifests when legitimate authenticated users leverage the DFE configuration to manipulate session tokens or authentication headers, effectively gaining access to resources and functionalities reserved for other user accounts. This issue represents a significant security weakness in the application's access control mechanisms, particularly when dealing with distributed deployment scenarios where multiple front-end servers coordinate operations. The vulnerability directly maps to CWE-285: Improper Authorization, which addresses insufficient authorization checks in software applications, and aligns with ATT&CK technique T1078.004: Valid Accounts, as it exploits legitimate user credentials through flawed authorization controls. The impact extends beyond simple privilege escalation to potentially enable data theft, unauthorized system modifications, and complete compromise of the deployment environment's integrity. Organizations utilizing UCD in distributed front-end configurations face heightened risk of unauthorized access and potential lateral movement within their deployment infrastructure. The vulnerability demonstrates poor separation of concerns in the authentication architecture, where session boundaries are not properly enforced across distributed components, allowing for cross-user session manipulation.
The technical implementation of this vulnerability involves the manipulation of authentication tokens or headers that are passed between the distributed front-end components and the central server. When DFE is enabled, the system creates a communication channel that should maintain proper user context boundaries, but fails to validate that the user identity remains consistent throughout the distributed operation. This creates an opportunity for an authenticated user to inject or modify authentication parameters that would normally be validated by the system's security controls. The flaw essentially allows for session hijacking within the distributed architecture, where one user's session can be leveraged to access another user's privileges and resources. Attackers could exploit this by crafting specific requests that manipulate the user context in the distributed processing pipeline, effectively bypassing the normal authentication flow that should prevent such cross-user access. The vulnerability is particularly concerning because it requires only authentication to the system to exploit, meaning that once an attacker has valid credentials, they can potentially escalate their privileges without requiring additional exploitation techniques. This characteristic places the vulnerability in the category of low-effort, high-impact security flaws that can be easily weaponized in targeted attacks against deployment environments.
Organizations should immediately implement mitigation strategies that include disabling the Distributed Front End feature if it is not strictly required for their deployment operations, or applying the vendor-provided security patches that address this specific authorization flaw. The recommended approach involves comprehensive security auditing of all UCD installations to identify systems with DFE enabled and implementing proper access controls to prevent unauthorized impersonation. Security teams should also monitor for unusual authentication patterns or session activity that might indicate exploitation attempts. Additional mitigations include implementing network segmentation between front-end and backend components, enforcing strict access controls on distributed deployment components, and conducting regular security assessments of the deployment infrastructure. The vulnerability's impact on enterprise deployment environments is significant, as it can lead to complete compromise of application deployment workflows and potential access to sensitive production systems. Organizations should also consider implementing multi-factor authentication controls and enhanced monitoring for authentication-related events to detect potential exploitation attempts. The security implications extend to compliance requirements, as this vulnerability could potentially violate various regulatory frameworks that mandate proper access controls and user authentication mechanisms in enterprise environments. The flaw highlights the critical importance of proper session management in distributed applications and serves as a reminder of the inherent security risks when multiple system components share authentication contexts without proper validation controls.