CVE-2023-6789 in PAN-OS
Summary
by MITRE • 12/13/2023
A cross-site scripting (XSS) vulnerability in Palo Alto Networks PAN-OS software enables a malicious authenticated read-write administrator to store a JavaScript payload using the web interface. Then, when viewed by a properly authenticated administrator, the JavaScript payload executes and disguises all associated actions as performed by that unsuspecting authenticated administrator.
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Analysis
by VulDB Data Team • 01/10/2024
This vulnerability represents a critical cross-site scripting flaw in Palo Alto Networks PAN-OS software that exploits the web interface authentication mechanisms to enable persistent malicious code execution. The vulnerability specifically affects authenticated administrators with read-write privileges who can leverage the interface to store malicious JavaScript payloads within the system. This creates a sophisticated attack vector where the malicious code remains dormant until triggered by another authenticated administrator, who unknowingly executes the payload while performing legitimate administrative tasks. The security implications extend beyond simple code execution, as the vulnerability allows attackers to impersonate legitimate administrators and mask their malicious activities within the system logs and audit trails.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding within the PAN-OS web interface components. When authenticated administrators interact with the system through the graphical user interface, the application fails to properly sanitize user-supplied input before storing it in persistent system elements. This allows attackers to inject malicious JavaScript code that gets executed in the context of other administrators' browsers when they view the affected system elements. The vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws in web applications, where insufficient validation of user-supplied data leads to unauthorized code execution. The attack pattern follows the typical XSS exploitation methodology where a malicious actor stores malicious content and waits for victims to trigger its execution through normal system interactions.
The operational impact of this vulnerability is particularly severe as it enables attackers to escalate privileges and maintain persistent access to the network security infrastructure. An attacker who gains read-write access to the PAN-OS web interface can craft payloads that execute with the privileges of the targeted administrator, potentially allowing full control over firewall policies, network access controls, and security configurations. The disguise effect means that all malicious actions appear legitimate within the system's audit logs, making detection extremely difficult and enabling long-term persistence within the network environment. This vulnerability undermines the fundamental security assumptions of administrative authentication and privilege separation, creating a backdoor that can be used to manipulate security policies, monitor network traffic, and potentially exfiltrate sensitive data without detection.
Organizations should implement immediate mitigations including applying the latest PAN-OS patches provided by Palo Alto Networks to address the XSS vulnerability, implementing strict input validation policies for all administrative interfaces, and establishing monitoring protocols to detect anomalous administrative activities that might indicate exploitation attempts. Security teams should also consider implementing additional authentication controls such as multi-factor authentication for administrative accounts, regular security audits of administrative interfaces, and network segmentation to limit the potential impact of successful exploitation. The vulnerability demonstrates the importance of secure coding practices and proper input sanitization in web applications, particularly those handling privileged administrative functions. Organizations should also review their incident response procedures to ensure they can detect and respond to cases where administrative activities appear legitimate but may be masking malicious behavior, as outlined in the attack patterns documented within the MITRE ATT&CK framework under the privilege escalation and persistence domains.