CVE-2021-29754 in WebSphere Application Server
Summary
by MITRE • 06/11/2021
IBM WebSphere Application Server 7.0, 8.0, 8.5, and 9.0 is vulnerable to a privilege escalation vulnerability when using the SAML Web Inbound Trust Association Interceptor (TAI). IBM X-Force ID: 202006.
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Analysis
by VulDB Data Team • 06/13/2021
The vulnerability identified as CVE-2021-29754 affects IBM WebSphere Application Server versions 7.0, 8.0, 8.5, and 9.0, specifically when utilizing the SAML Web Inbound Trust Association Interceptor component. This privilege escalation flaw represents a critical security weakness that could allow unauthorized users to gain elevated system privileges within the application server environment. The vulnerability resides within the authentication and authorization processing mechanisms of the WebSphere platform, particularly when handling SAML-based single sign-on scenarios. The SAML Web Inbound TAI component is responsible for validating SAML assertions and establishing trust relationships between the application server and identity providers, making it a prime target for attackers seeking to exploit authentication bypasses.
The technical implementation of this vulnerability stems from insufficient validation of SAML assertion attributes and insufficient access controls within the Trust Association Interceptor framework. When processing SAML assertions, the affected WebSphere versions fail to properly validate the identity claims and privilege levels contained within the assertion metadata. This weakness allows an attacker who can manipulate or forge SAML assertions to escalate their privileges within the application server, potentially gaining access to administrative functions or elevated user permissions that should be restricted to authorized personnel only. The flaw operates at the authentication layer, specifically targeting the trust association process that occurs during user authentication when SAML assertions are processed, creating a pathway for unauthorized privilege elevation through manipulated authentication tokens.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can enable attackers to perform a wide range of malicious activities within the compromised WebSphere environment. An attacker could potentially access sensitive application data, modify system configurations, deploy malicious code, or establish persistent access to the application server infrastructure. The vulnerability affects organizations that rely on SAML-based authentication for their WebSphere applications, particularly those implementing federated identity solutions or integrating with external identity providers. Given that WebSphere Application Server is widely used in enterprise environments for hosting critical business applications, the potential for widespread impact is significant, especially when the affected systems handle sensitive data or provide access to mission-critical services.
Organizations should immediately implement mitigations including applying the relevant IBM security patches and updates that address this privilege escalation vulnerability. The mitigation strategy should also include implementing additional access controls and monitoring mechanisms to detect suspicious authentication activities, particularly around SAML assertion processing. Network segmentation and firewall rules should be reviewed to limit access to the WebSphere application server components, especially those handling SAML authentication. Security monitoring should be enhanced to detect anomalies in authentication patterns and privilege elevation attempts. Additionally, organizations should conduct thorough security assessments of their SAML implementation, review trust association configurations, and ensure proper attribute validation is in place. This vulnerability aligns with CWE-284 which addresses improper access control, and represents a significant concern for ATT&CK technique T1078 related to valid accounts and privilege escalation. Regular security testing and vulnerability assessments should be conducted to ensure the effectiveness of implemented controls and to identify any additional weaknesses in the authentication and authorization frameworks.