CVE-2018-1778 in Connect
Summary
by MITRE
IBM LoopBack (IBM API Connect 2018.1, 2018.4.1, 5.0.8.0, and 5.0.8.4) could allow an attacker to bypass authentication if the AccessToken Model is exposed over a REST API, it is then possible for anyone to create an AccessToken for any User provided they know the userId and can hence get access to the other user’s data / access to their privileges (if the user happens to be an Admin for example). IBM X-Force ID: 148801.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 06/20/2023
The vulnerability identified as CVE-2018-1778 affects IBM LoopBack implementations within IBM API Connect versions 2018.1, 2018.4.1, 5.0.8.0, and 5.0.8.4, representing a critical authentication bypass flaw that undermines the security posture of applications leveraging these frameworks. This vulnerability stems from improper access control mechanisms within the AccessToken Model, which when exposed through REST APIs creates an exploitable condition that allows unauthorized actors to generate valid access tokens for arbitrary user accounts. The flaw specifically manifests when the AccessToken model is accessible via API endpoints, enabling attackers to manipulate the authentication system through predictable user identification patterns.
The technical implementation of this vulnerability resides in the lack of proper authorization checks within the LoopBack framework's token generation mechanisms. When the AccessToken model is exposed over REST interfaces, attackers can exploit the predictable structure of user identifiers to construct valid access tokens for target accounts without possessing legitimate credentials. This represents a classic authorization bypass vulnerability that aligns with CWE-285, which addresses improper authorization within software systems. The flaw essentially allows attackers to assume the identity of any user within the system by simply knowing the user identifier, creating a pathway for privilege escalation and unauthorized data access.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential data breaches, privilege abuse, and system compromise. An attacker could leverage this vulnerability to access sensitive user data, including administrative privileges if the target user holds elevated roles within the system. The implications are particularly severe given that IBM API Connect is designed for enterprise API management, meaning that successful exploitation could result in widespread data exposure across organizational systems. The vulnerability's exploitation requires minimal technical expertise and can be automated, making it particularly dangerous in production environments where user data integrity and access control are paramount.
Organizations affected by this vulnerability should implement immediate mitigations including restricting access to the AccessToken model through proper API endpoint controls and ensuring that authentication mechanisms are not exposed without adequate authorization checks. The implementation of proper input validation and access control enforcement is critical, as outlined in the OWASP Top Ten security principles and aligned with ATT&CK technique T1078 for valid accounts and T1566 for credential access. Regular security assessments and penetration testing should be conducted to identify similar exposure patterns within LoopBack applications, while implementing proper API gateway controls to prevent direct exposure of internal authentication models. Additionally, organizations should consider implementing additional authentication layers and monitoring mechanisms to detect anomalous token creation patterns that could indicate exploitation attempts.