CVE-2018-5280 in SonicOS
Summary
by MITRE
SonicWall SonicOS on Network Security Appliance (NSA) 2016 Q4 devices has XSS via the Configure SSO screens.
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Analysis
by VulDB Data Team • 01/29/2021
The vulnerability CVE-2018-5280 represents a cross-site scripting flaw discovered in SonicWall SonicOS firmware versions released in the 2016 fourth quarter for Network Security Appliance devices. This vulnerability specifically affects the Configure SSO (Single Sign-On) screens within the SonicOS interface, exposing organizations to potential exploitation through malicious web-based attacks. The issue stems from insufficient input validation and output encoding mechanisms within the web application layer of the security appliance, creating an avenue for attackers to inject malicious scripts into the application's user interface. The affected devices operate under the SonicOS operating system which manages various network security functions including firewall capabilities, intrusion prevention, and secure remote access services.
The technical implementation of this cross-site scripting vulnerability occurs when user-supplied input data is not properly sanitized before being rendered in the SSO configuration screens. Attackers can craft malicious payloads that exploit this weakness by injecting JavaScript code into form fields or URL parameters within the SSO configuration interface. When legitimate users access these compromised pages, the malicious scripts execute within their browser context, potentially allowing attackers to steal session cookies, perform unauthorized actions on behalf of users, or redirect victims to malicious websites. This flaw falls under CWE-79 which categorizes cross-site scripting vulnerabilities as a critical web application security weakness. The vulnerability is particularly concerning because it affects the administrative interface of network security appliances, potentially providing attackers with elevated privileges or access to sensitive network configuration data.
The operational impact of CVE-2018-5280 extends beyond simple script execution, as it represents a significant risk to network security infrastructure. Organizations using affected SonicWall NSA devices may face unauthorized access to their security configurations, potentially leading to complete network compromise. The vulnerability could enable attackers to manipulate SSO settings, create backdoor access points, or modify authentication parameters that control network access. This threat is particularly dangerous in enterprise environments where these appliances serve as critical network security gateways, potentially allowing lateral movement within networks or providing attackers with persistent access to sensitive corporate resources. The vulnerability affects the core administrative functionality of the devices, making it a high-priority target for exploitation. According to ATT&CK framework, this vulnerability maps to T1059.007 for script injection techniques and T1566 for social engineering attacks that leverage web-based exploitation methods.
Mitigation strategies for CVE-2018-5280 should prioritize immediate firmware updates from SonicWall to address the identified XSS vulnerability. Organizations must ensure their SonicWall devices are running the latest firmware versions that include proper input validation and output encoding fixes. Network administrators should implement additional security measures including web application firewalls, strict input validation policies, and regular security assessments of network infrastructure components. Access controls should be strengthened through multi-factor authentication and role-based access restrictions on administrative interfaces. The vulnerability also highlights the importance of network segmentation and monitoring of administrative access to security appliances. Organizations should conduct comprehensive vulnerability assessments to identify any other potentially affected systems and implement network-wide security monitoring to detect suspicious activities that may indicate exploitation attempts. Regular patch management processes must be established to ensure timely deployment of security updates for all network security infrastructure components.