CVE-2018-20306 in Virtual Traffic Manager
Summary
by MITRE
A stored cross-site scripting (XSS) vulnerability in the web administration user interface of Pulse Secure Virtual Traffic Manager may allow a remote authenticated attacker to inject web script or HTML via a crafted website and steal sensitive data and credentials. Affected releases are Pulse Secure Virtual Traffic Manager 9.9 versions prior to 9.9r2 and 10.4r1.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 04/22/2020
The vulnerability identified as CVE-2018-20306 represents a critical stored cross-site scripting flaw within the Pulse Secure Virtual Traffic Manager administration interface. This security weakness exists in the web-based management console that administrators use to configure and monitor network traffic policies. The vulnerability affects specific versions of the Pulse Secure Virtual Traffic Manager platform, particularly those in the 9.9 release series prior to 9.9r2 and the 10.4 release series prior to 10.4r1. The affected system operates as a virtual traffic management solution that handles network traffic routing and security policies, making it a prime target for attackers seeking to compromise network infrastructure.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding within the web administration interface. When authenticated users interact with the management console to create or modify configuration elements, maliciously crafted data can be stored within the application's database or configuration files. This stored data is then subsequently rendered in the user interface without proper sanitization, creating an environment where attacker-controlled scripts can execute in the context of other authenticated users. The flaw specifically manifests when the application fails to properly escape or encode user-supplied content before displaying it in web pages, allowing attackers to inject malicious javascript code that persists across user sessions.
The operational impact of this vulnerability extends beyond simple data theft, as it provides attackers with the capability to execute arbitrary code within the context of the victim's browser session. An authenticated attacker with access to the administration interface can craft malicious payloads that, when viewed by other administrators or users with access to the management console, execute scripts to steal session cookies, credentials, and other sensitive information. This vulnerability enables attackers to potentially escalate privileges, access confidential network configurations, and manipulate traffic routing policies. The stored nature of the vulnerability means that the malicious code persists even after the initial injection, allowing for prolonged access and data exfiltration without requiring continuous interaction from the attacker.
Mitigation strategies for CVE-2018-20306 should prioritize immediate patching of affected systems to the latest available releases that contain the necessary security fixes. Organizations should implement network segmentation to limit access to the administration interface, requiring strong authentication mechanisms including multi-factor authentication and implementing role-based access controls to minimize the attack surface. The vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws, and the attack pattern follows typical XSS exploitation techniques documented in the MITRE ATT&CK framework under the T1059.007 technique for scripting languages and T1566 for social engineering attacks that leverage user trust. Regular security audits of web applications and input validation testing should be conducted to identify similar vulnerabilities, while implementing content security policies and proper output encoding practices can provide additional defense-in-depth measures against similar attacks.