CVE-2023-0010 in PAN-OS
Summary
by MITRE • 06/14/2023
A reflected cross-site scripting (XSS) vulnerability in the Captive Portal feature of Palo Alto Networks PAN-OS software can allow a JavaScript payload to be executed in the context of an authenticated Captive Portal user’s browser when they click on a specifically crafted link.
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Analysis
by VulDB Data Team • 07/13/2023
The vulnerability identified as CVE-2023-0010 represents a critical reflected cross-site scripting flaw within the Captive Portal functionality of Palo Alto Networks PAN-OS software. This security weakness resides in the web interface handling of user input parameters, specifically affecting the authentication and session management processes that occur when users interact with captive portals. The vulnerability is particularly concerning because it operates at the intersection of network security infrastructure and user browser execution contexts, creating a potential attack vector that could compromise authenticated sessions within enterprise environments.
The technical implementation of this XSS vulnerability stems from insufficient input validation and output sanitization within the captive portal's web interface components. When a user clicks on a maliciously crafted link that contains specially formatted JavaScript code, the vulnerable PAN-OS software fails to properly escape or filter the input before rendering it in the user's browser context. This reflected behavior occurs because the application directly incorporates user-supplied parameters into web responses without adequate sanitization measures, allowing attacker-controlled code to execute within the security context of an authenticated user session. The flaw is classified as CWE-79 - Improper Neutralization of Input During Web Page Generation, which directly maps to the common patterns of XSS vulnerabilities in web applications.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to hijack authenticated user sessions, access sensitive network resources, and potentially escalate privileges within the network infrastructure. An attacker who successfully exploits this vulnerability can execute arbitrary JavaScript code in the victim's browser, which may include session theft mechanisms, credential harvesting, or redirection to malicious sites. The attack requires user interaction through a specifically crafted link, making it a server-side request forgery or phishing vector that leverages social engineering tactics. This vulnerability directly aligns with ATT&CK technique T1566.001 - Phishing: Spearphishing Attachment, as it relies on user engagement with malicious links to deliver the exploit payload.
Organizations running affected PAN-OS versions face significant risk exposure, particularly in environments where captive portals are used for guest access, employee authentication, or network access control. The vulnerability's exploitation potential increases when users have elevated privileges or access to sensitive network resources through the captive portal functionality. Network security teams must consider that successful exploitation could lead to complete compromise of the affected network infrastructure, as the authenticated context provides access to network policies, user management functions, and potentially sensitive operational data. The vulnerability demonstrates the critical importance of input validation and output encoding in web applications, particularly within security infrastructure components that handle user authentication and session management. Mitigation strategies should include immediate software patching, network segmentation to limit access to captive portal functions, and enhanced monitoring for suspicious user behavior or access patterns that may indicate exploitation attempts.