CVE-2019-4036 in Security Access Manager Appliance
Summary
by MITRE
IBM Security Access Manager Appliance could allow unauthenticated attacker to cause a denial of service in the reverse proxy component. IBM X-Force ID: 156159.
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Analysis
by VulDB Data Team • 01/29/2024
The vulnerability identified as CVE-2019-4036 affects the IBM Security Access Manager Appliance, specifically targeting its reverse proxy component. This issue represents a significant security weakness that could be exploited by unauthenticated attackers to disrupt service availability. The reverse proxy functionality serves as a critical intermediary layer in the appliance's architecture, handling incoming requests and forwarding them to appropriate backend services while maintaining security policies and access controls.
The technical flaw manifests as a denial of service condition within the reverse proxy module where an attacker can craft specific requests that cause the component to become unresponsive or crash entirely. This vulnerability stems from inadequate input validation and error handling mechanisms within the reverse proxy implementation. The flaw allows an attacker to exploit the system through crafted HTTP requests that trigger resource exhaustion or internal state corruption, effectively rendering the reverse proxy component inoperable. The vulnerability is particularly concerning because it requires no authentication credentials to exploit, making it accessible to any external party with network access to the appliance.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise the overall security posture of organizations relying on IBM Security Access Manager. When the reverse proxy component fails, legitimate users experience complete loss of access to protected services through the appliance, creating significant business continuity issues. The denial of service can be sustained through repeated exploitation attempts, potentially leading to prolonged service outages that affect multiple applications and users simultaneously. Organizations may face regulatory compliance challenges if such disruptions occur in environments governed by security standards requiring high availability and continuous service delivery.
Mitigation strategies for CVE-2019-4036 should include immediate deployment of IBM security patches and updates released for the affected appliance versions. Network segmentation and firewall rules can help limit exposure by restricting direct access to the appliance from untrusted networks. Implementing rate limiting and request filtering mechanisms can help detect and prevent exploitation attempts by monitoring for anomalous traffic patterns that match the vulnerability characteristics. Organizations should also consider deploying intrusion detection systems capable of identifying the specific attack signatures associated with this vulnerability. The vulnerability aligns with CWE-400, which addresses "Uncontrolled Resource Consumption" and maps to ATT&CK technique T1499.004 for "Endpoint Denial of Service" in the context of maintaining service availability and system integrity. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in the appliance's configuration and ensure comprehensive protection against related attack vectors.