CVE-2020-4499 in Security Access Manager
Summary
by MITRE • 10/15/2020
IBM Security Access Manager 9.0.7 and IBM Security Verify Access 10.0.0 could allow an unauthorized public Oauth client to bypass some or all of the authentication checks and gain access to applications. IBM X-Force ID: 182216.
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Analysis
by VulDB Data Team • 11/20/2020
The vulnerability identified as CVE-2020-4499 affects IBM Security Access Manager version 9.0.7 and IBM Security Verify Access version 10.0.0, representing a critical authentication bypass flaw that could enable unauthorized access to protected applications. This vulnerability specifically targets the OAuth client configuration mechanisms within these security platforms, creating a pathway for malicious actors to circumvent authentication controls and gain unauthorized access to enterprise applications. The flaw resides in how the systems handle public OAuth clients, which are typically designed to operate without client secrets, making them inherently more vulnerable to exploitation when proper validation mechanisms are absent.
The technical implementation of this vulnerability stems from insufficient validation of OAuth client configurations within the IBM Security Access Manager and Verify Access platforms. When public OAuth clients are improperly configured or validated, the systems fail to properly enforce authentication requirements that should normally be mandatory for access control. This represents a failure in the principle of least privilege and authentication enforcement, where the platform should validate all client requests regardless of whether they originate from public or confidential clients. The vulnerability allows attackers to exploit the absence of proper validation checks that should occur during the OAuth authorization process, specifically during the client registration and validation phases.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it potentially enables attackers to bypass multiple layers of security controls that should normally be enforced by the access management platform. An attacker who successfully exploits this vulnerability could gain access to sensitive applications and data without proper authentication, potentially leading to data breaches, privilege escalation, and further lateral movement within the network. The implications are particularly severe given that these platforms are designed to serve as primary security gateways for enterprise applications, making this vulnerability a significant threat to organizational security posture and compliance requirements.
Organizations utilizing these IBM security platforms should implement immediate mitigations including updating to the latest available patches from IBM, reviewing and hardening OAuth client configurations, and implementing additional monitoring controls to detect unauthorized client registrations. The vulnerability aligns with CWE-287, which addresses improper authentication, and relates to ATT&CK technique T1078.004 for valid accounts, as attackers could potentially use this flaw to gain access to legitimate accounts through bypassed authentication mechanisms. Security teams should also consider implementing network segmentation, additional access controls, and enhanced logging to detect anomalous OAuth client behavior that might indicate exploitation attempts.