CVE-2019-8990 in ActiveMatrix BusinessWorks
Summary
by MITRE
The HTTP Connector component of TIBCO Software Inc.'s TIBCO ActiveMatrix BusinessWorks contains a vulnerability that theoretically allows unauthenticated HTTP requests to be processed by the BusinessWorks engine even when authentication is required. This possibility is restricted to circumstances where HTTP "Basic Authentication" policy is used in conjunction with an XML Authentication resource. The BusinessWorks engine might instead use credentials from a prior HTTP request for authorization purposes. Affected releases are TIBCO Software Inc. TIBCO ActiveMatrix BusinessWorks: versions up to and including 6.4.2.
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Analysis
by VulDB Data Team • 08/28/2023
The vulnerability identified as CVE-2019-8990 resides within the HTTP Connector component of TIBCO ActiveMatrix BusinessWorks, a middleware platform designed for enterprise application integration and business process automation. This security flaw represents a critical authorization bypass issue that fundamentally undermines the intended security controls of the system. The vulnerability specifically manifests when the BusinessWorks engine employs HTTP Basic Authentication policies in combination with XML Authentication resources, creating a scenario where the system's authentication mechanisms can be circumvented through improper credential handling. The flaw stems from the engine's tendency to reuse credentials from previous HTTP requests rather than properly validating authentication for each individual request, effectively allowing unauthorized access to protected resources.
The technical implementation of this vulnerability involves a flaw in the authentication processing logic where the BusinessWorks engine fails to properly isolate and validate authentication contexts between separate HTTP requests. When a client makes an initial authenticated request using HTTP Basic Authentication, the system should establish a fresh authentication context for subsequent requests. However, due to the flaw, the engine may inadvertently reuse authentication tokens or credentials from previous interactions, potentially allowing an attacker to exploit this behavior to gain access to resources that should require fresh authentication. This issue is particularly concerning because it operates at the HTTP protocol level within the application integration framework, affecting how the system handles security policies and credential validation across multiple request sessions. The vulnerability is classified under CWE-287, which deals with improper authentication scenarios, and aligns with ATT&CK technique T1078.101 for Valid Accounts: Default Accounts, as it potentially allows unauthorized access through credential reuse patterns.
The operational impact of CVE-2019-8990 extends beyond simple unauthorized access to encompass potential data breaches, privilege escalation, and system compromise within environments utilizing affected TIBCO ActiveMatrix BusinessWorks versions. Organizations relying on this middleware for business process automation and integration may experience unauthorized access to sensitive business data, process manipulation, or system disruption when attackers exploit this vulnerability. The risk is particularly elevated in environments where the affected software handles sensitive business transactions or integrates with critical enterprise systems. Attackers could leverage this vulnerability to perform unauthorized operations on business processes, access protected resources, or potentially escalate privileges within the integrated application ecosystem. The vulnerability affects all versions up to and including 6.4.2 of TIBCO ActiveMatrix BusinessWorks, representing a significant security gap in the platform's authentication handling capabilities that could be exploited by both internal and external threat actors.
Mitigation strategies for CVE-2019-8990 should prioritize immediate patching of affected systems with the vendor-provided security updates, as TIBCO has released fixes for this vulnerability. Organizations should also implement network-level restrictions to limit access to affected systems, particularly those handling sensitive business processes or data. Security monitoring should be enhanced to detect anomalous authentication patterns or credential reuse behaviors that might indicate exploitation attempts. Additionally, system administrators should review and tighten authentication policies, ensuring that authentication contexts are properly isolated between requests and that the system enforces fresh authentication for each transaction. The remediation process should include thorough testing of patched environments to ensure that the fix does not introduce regressions in legitimate business processes. Organizations should also consider implementing additional security controls such as intrusion detection systems, API gateways, or additional authentication layers to provide defense-in-depth against potential exploitation of this vulnerability. Regular security assessments and vulnerability scanning should be conducted to identify any other potential authentication bypass issues within the broader TIBCO ecosystem or related integration platforms.