CVE-2025-59990
📋 TL;DR
This Cross-site Scripting (XSS) vulnerability in Juniper Networks Junos Space allows attackers to inject malicious scripts into template creation pages. When other users (including administrators) view these pages, the attacker can execute commands with the victim's permissions. All Junos Space versions before 24.1R4 are affected.
💻 Affected Systems
- Juniper Networks Junos Space
📦 What is this software?
Junos Space by Juniper
Junos Space by Juniper
Junos Space by Juniper
Junos Space by Juniper
⚠️ Risk & Real-World Impact
Worst Case
An attacker could gain administrative access to Junos Space, potentially compromising the entire network management system, modifying configurations, accessing sensitive network data, or pivoting to other systems.
Likely Case
Attackers could steal administrator session cookies, perform actions as authenticated users, or deface web interface pages.
If Mitigated
With proper input validation and output encoding, the attack would fail to execute malicious scripts.
🎯 Exploit Status
Requires attacker to have access to create or modify templates, then lure victims to view those templates. The CVSS score of 6.1 indicates medium attack complexity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 24.1R4 or later
Vendor Advisory: https://supportportal.juniper.net/JSA103140
Restart Required: No
Instructions:
1. Download Junos Space 24.1R4 or later from Juniper support portal. 2. Backup current configuration. 3. Apply the update through the Junos Space web interface or CLI. 4. Verify the update completed successfully.
🔧 Temporary Workarounds
Restrict template creation access
allLimit user permissions to only trusted administrators for template creation and modification functions
Configure role-based access control in Junos Space to restrict template management
Implement Content Security Policy
allAdd CSP headers to restrict script execution from untrusted sources
Add 'Content-Security-Policy' header with appropriate directives for Junos Space web interface
🧯 If You Can't Patch
- Isolate Junos Space management interface to trusted networks only
- Implement strict input validation and output encoding at the application layer if custom templates are used
🔍 How to Verify
Check if Vulnerable:
Check Junos Space version via web interface (Admin > System > About) or CLI command 'show version'Check Version:
show version | match SpaceVerify Fix Applied:
Verify version is 24.1R4 or later and test template creation pages for script injection attempts📡 Detection & Monitoring
Log Indicators:
- Unusual template creation/modification activity
- Multiple failed login attempts followed by template access
- Script tags or JavaScript in template content logs
Network Indicators:
- HTTP requests with script injection patterns to template endpoints
- Unusual outbound connections from Junos Space after template viewing
SIEM Query:
source="junos-space" AND (uri_path="/template" OR uri_path="/api/templates") AND (http_method="POST" OR http_method="PUT") AND (content CONTAINS "<script>" OR content CONTAINS "javascript:")