CVE-2017-2337 : Vulnerability Insights and Analysis

ScreenOS: XSS vulnerability in ScreenOS Firewall

Understanding CVE-2017-2337

This CVE involves a persistent cross-site scripting vulnerability in the Juniper Networks Juniper NetScreen Firewall+VPN, affecting the NetScreen WebUI component.

What is CVE-2017-2337?

The vulnerability allows a user with the 'security' role to inject HTML/JavaScript code into the management session of other users, including the administrator. This enables the user with lower privileges to execute commands as if they were the administrator.

The Impact of CVE-2017-2337

CVSS Base Score: 8.4 (High)
Attack Vector: Network
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High
Privileges Required: High
User Interaction: Required
Scope: Changed

Technical Details of CVE-2017-2337

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The persistent cross-site scripting vulnerability in the NetScreen WebUI of Juniper Networks Juniper NetScreen Firewall+VPN running ScreenOS allows unauthorized code injection.

Affected Systems and Versions

Affected Platforms: SSG Series
Affected Product: ScreenOS
Affected Versions: 6.3.0 prior to 6.3.0r24

Exploitation Mechanism

The vulnerability can be exploited by a user with the 'security' role to manipulate the management session of other users, leading to unauthorized command execution.

Mitigation and Prevention

Protect your systems from CVE-2017-2337 with the following measures:

Immediate Steps to Take

Use access lists or firewall filters to restrict access to the firewall's WebUI to trusted hosts.

Long-Term Security Practices

Regularly monitor and update security configurations.
Educate users on safe browsing practices and security awareness.

Patching and Updates

Update to ScreenOS 6.3.0r24 or later to address this vulnerability.
Refer to KB16765 for information on fixed vulnerabilities in different software releases.