CVE-2022-0026 in Cortex XDR Agent
Summary
by MITRE • 05/11/2022
A local privilege escalation (PE) vulnerability exists in Palo Alto Networks Cortex XDR agent software on Windows that enables an authenticated local user with file creation privilege in the Windows root directory (such as C:\) to execute a program with elevated privileges. This issue impacts all versions of Cortex XDR agent without content update 330 or a later content update version.
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Analysis
by VulDB Data Team • 05/13/2022
The vulnerability CVE-2022-0026 represents a critical local privilege escalation flaw within Palo Alto Networks Cortex XDR agent software running on Windows platforms. This security weakness specifically targets the agent's handling of file operations in the Windows root directory, creating an avenue for authenticated local users to escalate their privileges from standard user level to administrator level. The vulnerability stems from improper privilege management and file system access controls within the agent's implementation, allowing malicious actors with minimal system access to potentially gain complete system control. The issue affects all versions of the Cortex XDR agent prior to content update 330, making it a widespread concern for organizations utilizing this security solution.
The technical exploitation mechanism relies on the authenticated local user's ability to create files in the Windows root directory, typically requiring only basic user privileges and write permissions to the system drive. When the Cortex XDR agent processes certain file operations or executes scheduled tasks, it inadvertently loads or executes malicious code placed in the root directory by the attacker. This occurs due to insufficient validation of file paths and lack of proper privilege separation during file operations. The flaw operates at the operating system level where the agent's execution context does not properly restrict file access to privileged locations, creating a path traversal or file injection vulnerability that directly enables privilege escalation. According to CWE classification, this vulnerability maps to CWE-276: Incorrect Permission Assignment for Critical Resource, as it involves improper access control mechanisms that allow unauthorized privilege elevation.
The operational impact of CVE-2022-0026 extends beyond simple privilege escalation, as it provides attackers with complete system compromise capabilities. Once elevated, an attacker can access all system resources, modify critical files, install additional malware, and potentially establish persistence mechanisms. The vulnerability is particularly concerning because it requires minimal prerequisites for exploitation, typically just local user access and basic file creation capabilities. Organizations running affected Cortex XDR agent versions face significant risk as this vulnerability can be exploited by malware or insider threats without requiring network access or advanced attack techniques. The impact is amplified in enterprise environments where the XDR agent is deployed across multiple endpoints, potentially allowing attackers to compromise entire networks through a single vulnerable endpoint.
Mitigation strategies for CVE-2022-0026 primarily focus on immediate patching and operational security enhancements. Organizations must immediately upgrade their Cortex XDR agents to content update 330 or later versions that contain the necessary security fixes. System administrators should also implement additional monitoring and access controls to detect unauthorized file creation in the Windows root directory. The ATT&CK framework categorizes this vulnerability under T1068: Exploitation for Privilege Escalation, emphasizing the need for endpoint protection and behavioral monitoring. Additional mitigations include implementing least privilege principles for local user accounts, restricting write permissions to system directories, and deploying endpoint detection and response solutions that can identify suspicious file creation patterns. Regular security assessments and vulnerability scanning should be conducted to ensure all endpoints are properly updated and protected against similar privilege escalation vectors.