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CVE-2017-2339 : Exploit Details and Defense Strategies

Learn about CVE-2017-2339, a high-severity vulnerability in Juniper Networks' ScreenOS Firewall allowing unauthorized users to execute commands with administrator privileges. Find mitigation steps and update information here.

A security vulnerability in the NetScreen WebUI of Juniper Networks' Juniper NetScreen Firewall+VPN running ScreenOS allows unauthorized users to inject HTML/JavaScript content into the management session, potentially executing commands with administrator permissions.

Understanding CVE-2017-2339

This CVE involves a persistent cross-site scripting vulnerability in ScreenOS Firewall.

What is CVE-2017-2339?

This vulnerability in Juniper Networks' ScreenOS allows users with the 'security' role to manipulate the management session, posing a risk of unauthorized command execution with elevated privileges.

The Impact of CVE-2017-2339

        CVSS Base Score: 8.4 (High Severity)
        Attack Vector: Network
        Confidentiality, Integrity, and Availability Impact: High
        Privileges Required: High
        User Interaction: Required
        Scope: Changed
        Exploitation: No known malicious exploitation reported

Technical Details of CVE-2017-2339

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The vulnerability allows users with lower privileges to inject malicious content into the management session, potentially executing commands with administrator permissions.

Affected Systems and Versions

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

Exploitation Mechanism

The vulnerability can be exploited by users with the 'security' role to inject harmful HTML/JavaScript content into the management session, compromising system integrity.

Mitigation and Prevention

Protect your systems from CVE-2017-2339 with the following measures:

Immediate Steps to Take

        Implement access lists or firewall filters to restrict WebUI access to trusted hosts.

Long-Term Security Practices

        Regularly monitor and update security configurations.
        Conduct security training to educate users on safe practices.

Patching and Updates

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

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