CVE-2017-12416 in PAN-OS
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the GlobalProtect internal and external gateway interface in Palo Alto Networks PAN-OS before 6.1.18, 7.0.x before 7.0.17, 7.1.x before 7.1.12, and 8.0.x before 8.0.3 allows remote attackers to inject arbitrary web script or HTML via vectors related to improper request parameter validation.
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Analysis
by VulDB Data Team • 01/10/2021
The CVE-2017-12416 vulnerability represents a critical cross-site scripting flaw affecting Palo Alto Networks PAN-OS versions prior to specific patch releases. This vulnerability exists within the GlobalProtect internal and external gateway interface components, which are essential for secure remote access and network protection services. The flaw stems from inadequate validation of request parameters, creating an avenue for malicious actors to execute arbitrary web scripts or HTML code within the context of affected systems. The vulnerability impacts multiple major PAN-OS version branches including 6.1.x, 7.0.x, 7.1.x, and 8.0.x, indicating a widespread exposure across the product line. Security researchers identified that the issue occurs when the system fails to properly sanitize user-supplied input parameters, allowing attackers to craft malicious requests that bypass validation mechanisms and execute unauthorized code in the victim's browser.
The technical exploitation of this vulnerability follows standard XSS attack patterns where attackers can manipulate input fields or URL parameters to inject malicious scripts. The improper request parameter validation means that user-controllable data flows directly into the application's output without adequate sanitization or encoding. This creates a persistent threat vector that can be leveraged for session hijacking, credential theft, or redirection to malicious sites. The vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and demonstrates how inadequate input validation creates fundamental security weaknesses. Attackers can exploit this by crafting specially formatted requests that, when processed by the vulnerable GlobalProtect interface, execute malicious JavaScript code in the context of authenticated users' browsers. The attack surface is particularly concerning given that GlobalProtect interfaces are typically accessible to remote users and may contain sensitive network information.
The operational impact of CVE-2017-12416 extends beyond simple script injection, as it can enable sophisticated attacks that compromise entire network security postures. Remote attackers can leverage this vulnerability to establish persistent access, steal session tokens, or redirect users to phishing sites that appear legitimate within the corporate network context. The vulnerability affects both internal and external gateway interfaces, meaning that attackers can potentially exploit it from various network positions, including from outside the corporate perimeter. This creates a significant risk for organizations relying on Palo Alto Networks firewalls for perimeter protection, as the vulnerability could allow attackers to bypass network security controls and establish footholds within protected environments. The impact is particularly severe when considering that GlobalProtect is commonly used for remote access, making the vulnerability exploitable from any location with internet connectivity and appropriate network access. Organizations may experience unauthorized data exfiltration, privilege escalation, or complete compromise of their remote access infrastructure.
Mitigation strategies for CVE-2017-12416 require immediate deployment of vendor-provided patches and updates to affected PAN-OS versions. Organizations should prioritize upgrading to PAN-OS versions 6.1.18, 7.0.17, 7.1.12, and 8.0.3 or later, which contain the necessary fixes for the improper request parameter validation. Network administrators should implement additional defensive measures including enhanced web application firewalls, input validation rules, and monitoring for suspicious traffic patterns that may indicate exploitation attempts. The vulnerability demonstrates the importance of robust input sanitization and parameter validation as outlined in the OWASP Top Ten security principles. Security teams should conduct comprehensive vulnerability assessments to identify any other potential XSS vulnerabilities within their network infrastructure and implement proper security monitoring to detect exploitation attempts. Regular security updates and patch management processes become critical defensive measures against such threats, as the vulnerability represents a fundamental flaw in how user input is processed within the GlobalProtect interface. Organizations should also consider implementing additional network segmentation and access controls to limit the potential impact of successful exploitation attempts, particularly for remote access services that are critical to business operations.