CVE-2023-36679
📋 TL;DR
This Server-Side Request Forgery (SSRF) vulnerability in the Spectra WordPress plugin allows attackers to make unauthorized requests from the vulnerable server to internal or external systems. It affects WordPress sites using Spectra (formerly Ultimate Addons for Gutenberg) from all versions up to 2.6.6. Attackers could potentially access internal services, perform port scanning, or interact with cloud metadata services.
💻 Affected Systems
- WordPress Spectra plugin (formerly Ultimate Addons for Gutenberg)
📦 What is this software?
Spectra by Brainstormforce
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access internal services, cloud metadata (potentially obtaining credentials), perform port scanning, or use the server as a proxy for attacks against other systems.
Likely Case
Information disclosure from internal services, limited port scanning, or using the server to make requests to external systems that appear legitimate.
If Mitigated
Limited impact if network segmentation restricts outbound connections and internal services are properly secured with authentication.
🎯 Exploit Status
SSRF vulnerabilities are commonly exploited and weaponized. While no public PoC is confirmed, the vulnerability type suggests exploitation is straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.6.7 and later
Vendor Advisory: https://patchstack.com/database/vulnerability/ultimate-addons-for-gutenberg/wordpress-spectra-plugin-2-6-6-server-side-request-forgery-ssrf-vulnerability
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Spectra' plugin. 4. Click 'Update Now' if update is available. 5. Alternatively, download version 2.6.7+ from WordPress.org and manually update.
🔧 Temporary Workarounds
Disable Spectra Plugin
allTemporarily disable the vulnerable plugin until patching is possible
wp plugin deactivate ultimate-addons-for-gutenberg
Restrict Outbound Network Access
linuxUse firewall rules to limit the server's ability to make outbound requests to internal networks
iptables -A OUTPUT -p tcp --dport 80 -j DROP
iptables -A OUTPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Implement network segmentation to restrict the web server from accessing internal services
- Use a Web Application Firewall (WAF) with SSRF protection rules
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for Spectra version. If version is 2.6.6 or lower, you are vulnerable.Check Version:
wp plugin get ultimate-addons-for-gutenberg --field=versionVerify Fix Applied:
Verify Spectra plugin version is 2.6.7 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual outbound HTTP requests from web server to internal IPs
- Requests to cloud metadata endpoints (169.254.169.254, etc.)
- Multiple failed connection attempts to various ports
Network Indicators:
- Web server making unexpected outbound connections
- Requests to internal services from web server IP
SIEM Query:
source="web_server_logs" AND (dest_ip=169.254.169.254 OR dest_ip IN [RFC1918_ranges]) AND user_agent CONTAINS "WordPress"🔗 References
- https://patchstack.com/database/vulnerability/ultimate-addons-for-gutenberg/wordpress-spectra-plugin-2-6-6-server-side-request-forgery-ssrf-vulnerability?_s_id=cve
- https://patchstack.com/database/vulnerability/ultimate-addons-for-gutenberg/wordpress-spectra-plugin-2-6-6-server-side-request-forgery-ssrf-vulnerability?_s_id=cve
