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.