CVE-2017-2338 : Security Advisory and Response

A persistent cross-site scripting vulnerability in the NetScreen WebUI of Juniper Networks Juniper NetScreen Firewall+VPN running ScreenOS allows unauthorized users to execute commands with administrator permissions.

Understanding CVE-2017-2338

This CVE involves a persistent cross-site scripting vulnerability in Juniper Networks' ScreenOS, impacting specific versions and platforms.

What is CVE-2017-2338?

This vulnerability enables a user with the 'security' role to inject malicious HTML/JavaScript content into the management session of other users, including administrators, potentially leading to unauthorized command execution.

The Impact of CVE-2017-2338

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-2017-2338

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The vulnerability allows users with lower privileges to execute commands as administrators by injecting malicious content into the WebUI.

Affected Systems and Versions

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

Exploitation Mechanism

The vulnerability can be exploited by users with the 'security' role to manipulate the WebUI and execute unauthorized commands.

Mitigation and Prevention

Protect your systems from CVE-2017-2338 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 information on fixed vulnerabilities in different releases.