CVE-2017-1555 in API Connect
Summary
by MITRE
IBM API Connect 5.0.0.0 through 5.0.7.2 could allow an authenticated user to generate an API token when not subscribed to the application plan. IBM X-Force ID: 131545.
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Analysis
by VulDB Data Team • 01/14/2021
This vulnerability resides within IBM API Connect version 5.0.0.0 through 5.0.7.2, representing a critical authorization flaw that undermines the platform's access control mechanisms. The vulnerability stems from insufficient validation of subscription status during API token generation processes, allowing authenticated users to bypass normal application plan subscription requirements. This represents a direct violation of the principle of least privilege and demonstrates a significant weakness in the identity and access management framework of the API gateway. The flaw specifically affects the token generation workflow where the system fails to properly verify whether a user has subscribed to the appropriate application plan before issuing access credentials, creating a path for unauthorized privilege escalation.
The technical implementation of this vulnerability involves the API Connect system's token issuance logic failing to enforce subscription-based access controls during authentication flows. When an authenticated user attempts to generate an API token, the system should validate against the user's subscription status and the target application plan's requirements. However, the flaw allows token generation to proceed regardless of subscription status, effectively granting elevated privileges to users who should be restricted. This issue manifests as a failure in the authorization decision point within the API gateway's security architecture, where proper access control checks are either missing or improperly implemented. The vulnerability can be categorized under CWE-284, which addresses improper access control, and specifically relates to weak authorization mechanisms in API management systems.
The operational impact of this vulnerability extends beyond simple unauthorized access, potentially enabling attackers to exploit the API ecosystem for malicious activities. An authenticated user who can generate tokens without proper subscription status may gain access to premium API features, increased rate limits, or sensitive endpoints that should be restricted to subscribed users. This could lead to resource exhaustion, data leakage, or unauthorized API usage that affects both the service provider and legitimate subscribers. The vulnerability particularly impacts organizations relying on API Connect for monetization and access control, as it undermines the business model's ability to enforce subscription-based pricing and usage limits. Attackers could leverage this flaw to consume excessive API resources, potentially leading to denial of service for legitimate users or unauthorized data access that violates compliance requirements.
Organizations should implement immediate mitigations including applying the vendor-provided security patches and updates for IBM API Connect versions 5.0.0.0 through 5.0.7.2. Additionally, security teams should conduct comprehensive audits of API access controls and subscription validation mechanisms to identify potential exploitation vectors. Network segmentation and monitoring of API token generation activities should be enhanced to detect anomalous behavior patterns that might indicate exploitation attempts. The vulnerability aligns with ATT&CK technique T1078 which covers valid accounts and privilege escalation through unauthorized access to system resources. Organizations should also review their API governance policies to ensure proper subscription enforcement and implement additional logging and alerting mechanisms around token generation events to detect and respond to potential exploitation attempts. Regular security assessments of API management platforms are essential to prevent similar authorization bypass vulnerabilities from compromising the security posture of enterprise API ecosystems.