CVE-2020-4352 in IBM
Summary
by MITRE
IBM MQ on HPE NonStop 8.0.4 and 8.1.0 is vulnerable to a privilege escalation attack when running in restricted mode. IBM X-Force ID: 178427.
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Analysis
by VulDB Data Team • 10/21/2020
IBM MQ running on HPE NonStop systems presents a critical privilege escalation vulnerability in versions 8.0.4 and 8.1.0 when operating in restricted mode. This flaw allows authenticated attackers to elevate their privileges from standard user level to administrative access within the messaging infrastructure. The vulnerability stems from insufficient access controls and improper privilege management within the restricted execution environment, creating an attack vector that bypasses intended security boundaries. The restricted mode configuration is designed to limit system access and prevent unauthorized operations, yet this weakness enables malicious actors to circumvent these protective measures.
The technical implementation of this vulnerability involves the manipulation of system call interfaces and process execution contexts within the IBM MQ runtime environment. Attackers can exploit the privilege escalation mechanism by leveraging specific command sequences or API calls that should be restricted in the limited execution environment. This flaw operates at the system kernel level where process privileges are managed, allowing unauthorized code execution with elevated permissions. The vulnerability manifests through improper validation of user credentials and insufficient enforcement of privilege boundaries during system operations.
Operational impact of this vulnerability extends beyond immediate privilege compromise to encompass potential system-wide data breaches and service disruption. An attacker who successfully exploits this vulnerability can access sensitive messaging queues, modify message flows, intercept confidential communications, and potentially cause denial of service conditions. The restricted mode environment is specifically designed to protect against such attacks, making this vulnerability particularly concerning as it undermines fundamental security assumptions. Organizations relying on IBM MQ for mission-critical messaging may face significant operational risks including data loss, regulatory compliance violations, and reputational damage.
Mitigation strategies should focus on immediate patch application from IBM as the primary remediation approach, alongside comprehensive system hardening measures. Organizations must implement strict access controls and monitor for unauthorized privilege escalation attempts through security information and event management systems. The vulnerability aligns with CWE-276 which addresses improper privilege management, and maps to ATT&CK technique T1068 related to exploit for privilege escalation. Network segmentation and privilege separation should be enhanced to minimize potential attack surface, while regular security audits should verify proper enforcement of restricted execution modes. Additionally, implementing multi-factor authentication and continuous monitoring of system access logs will help detect anomalous privilege usage patterns that may indicate exploitation attempts.