CVE-2012-5951 in Tivoli Netview
Summary
by MITRE
Unspecified vulnerability in IBM Tivoli NetView 1.4, 5.1 through 5.4, and 6.1 on z/OS allows local users to gain privileges by leveraging access to the normal Unix System Services (USS) security level.
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Analysis
by VulDB Data Team • 04/20/2021
The vulnerability described in CVE-2012-5951 represents a privilege escalation issue within IBM Tivoli NetView versions 1.4, 5.1 through 5.4, and 6.1 running on the z/OS operating system platform. This security flaw exists at the intersection of system-level security controls and Unix System Services integration, creating a pathway for local attackers to elevate their privileges from standard user levels to higher administrative permissions. The vulnerability specifically leverages the existing access controls within the USS security framework, which governs how processes and users interact with system resources on IBM's mainframe platforms.
The technical mechanism behind this vulnerability stems from insufficient privilege validation within the Tivoli NetView application's interaction with the underlying z/OS Unix System Services environment. When users with normal USS security clearance attempt to execute certain operations within the NetView framework, the system fails to properly validate whether these operations should be permitted at the elevated privilege level required for system-level modifications. This weakness manifests in the application's failure to enforce proper access controls when transitioning between different security contexts, allowing local users to exploit the existing USS security model to gain unauthorized access to privileged system functions. The vulnerability operates at the system call level where applications interface with the operating system kernel, making it particularly dangerous as it bypasses traditional application-level security measures.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it fundamentally undermines the security model of the z/OS platform and the Tivoli NetView monitoring solution. Local attackers who can access the USS environment can potentially compromise the integrity of network monitoring data, modify system configurations, or gain access to sensitive operational information that would normally be restricted to authorized administrators. This vulnerability is particularly concerning in enterprise environments where Tivoli NetView is used for critical network monitoring and management, as it provides a pathway for malicious insiders or compromised accounts to escalate their privileges without requiring external attack vectors. The impact is amplified by the fact that z/OS systems often house critical business data and infrastructure, making such privilege escalation attacks potentially devastating to organizational security posture.
Mitigation strategies for CVE-2012-5951 should focus on implementing proper access control enforcement within the Tivoli NetView application and ensuring that all system interactions are properly validated against the current security context. Organizations should consider applying the official IBM security patches and updates that address the privilege escalation flaw in affected versions of Tivoli NetView. System administrators should also implement additional monitoring of system calls and privilege transitions within the USS environment to detect anomalous behavior that might indicate exploitation attempts. The vulnerability aligns with CWE-276, which describes improper privilege management, and represents a classic example of how insufficient access control validation can lead to privilege escalation attacks. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques where adversaries leverage existing legitimate credentials and system access to gain higher-level permissions, specifically targeting the T1068 privilege escalation technique. Organizations should also consider implementing principle of least privilege policies and regular security audits of system configurations to minimize the potential impact of such vulnerabilities.