CVE-2026-79806 in ClearPass Policy Manager
Summary
by MITRE • 10/06/2026
A privilege escalation vulnerability in the ClearPass Policy Manager OnGuard Linux agent could allow malicious users on a Linux instance to elevate their user privileges. A successful exploit allows a malicious user to escalate to root privileges on the affected Linux client.
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Analysis
by VulDB Data Team • 10/07/2026
The identified security flaw resides within the ClearPass Policy Manager OnGuard Linux agent, specifically affecting its privilege management mechanisms during local execution. This vulnerability represents a critical failure in access control enforcement, allowing an authenticated but unprivileged user on the target Linux instance to bypass standard permission restrictions and execute commands with elevated privileges. The core technical issue stems from improper handling of system calls or configuration files by the OnGuard agent, which fails to validate the authority of the invoking process before granting administrative rights. This type of flaw is characteristic of CWE-269, Improper Privilege Management, where the software does not properly restrict the actions of privileged users in terms of their ability to perform operations that only authorized administrators should be able to execute. The vulnerability likely involves a misconfiguration or code error within the agent's daemon processes that listen for local requests without sufficiently verifying the identity and permissions of the calling user context.
From an operational perspective, this privilege escalation vector poses a severe risk to endpoint security posture. An attacker who gains access to a Linux workstation or server with low-level privileges can leverage this flaw to obtain root access effectively immediately after initial compromise. This capability transforms a limited foothold into full system control, enabling the installation of persistent backdoors, modification of critical system configurations, and exfiltration of sensitive data stored on the host. The impact extends beyond the individual machine because ClearPass Policy Manager is often deployed in enterprise environments to enforce network access policies based on endpoint health status. If an attacker can escalate privileges locally, they may also manipulate the OnGuard agent's reporting mechanisms or configuration files to evade detection by the central management console, thereby maintaining stealth while conducting further lateral movement within the corporate network.
The exploitation of this vulnerability aligns with several tactics defined in the MITRE ATT&CK framework for enterprise environments. Specifically, it corresponds to T1068 Exploitation for Privilege Escalation, where adversaries leverage software vulnerabilities or misconfigurations to gain higher-level permissions. Furthermore, depending on the specific method used to trigger the escalation, such as exploiting a setuid binary or abusing sudo configurations managed by the agent, it may also relate to T1548 Abuse Elevation Control Mechanism. The presence of this flaw undermines the integrity of the endpoint compliance checks that ClearPass relies upon for network segmentation and access control decisions. If an attacker can bypass these local security controls, they effectively neutralize a key layer of defense-in-depth strategy employed by many organizations to prevent unauthorized devices or compromised endpoints from accessing sensitive network resources.
To mitigate this risk, administrators must apply the latest software updates provided by Aruba Networks for ClearPass Policy Manager and its associated OnGuard agents immediately upon release. These patches typically address the underlying code flaws that allow unchecked privilege elevation. In addition to patching, organizations should review their Linux endpoint configurations to ensure that no unnecessary setuid bits are present on binaries related to network access control tools. Implementing strict file integrity monitoring can help detect unauthorized modifications to agent configuration files or executables that might indicate exploitation attempts. Furthermore, adopting the principle of least privilege across all endpoints ensures that even if a vulnerability is exploited, the potential blast radius remains contained by limiting the default permissions assigned to standard user accounts. Regular audits of sudo configurations and local group memberships are also recommended to minimize opportunities for unauthorized administrative access.