CVE-2022-27311
📋 TL;DR
CVE-2022-27311 is a Server-Side Request Forgery (SSRF) vulnerability in Gibbon v3.4.4 and earlier that allows attackers to make unauthorized requests from the vulnerable server to internal or external systems. Attackers can exploit this by crafting malicious URLs, potentially accessing sensitive internal services or conducting further attacks. All users running affected Gibbon versions are vulnerable.
💻 Affected Systems
- Gibbon
📦 What is this software?
Gibbon by Gibbon Project
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of internal network services, data exfiltration, lateral movement to other systems, or using the server as a proxy for attacks against external targets.
Likely Case
Unauthorized access to internal services, information disclosure from internal APIs or systems, and potential credential theft from metadata services.
If Mitigated
Limited impact with proper network segmentation, egress filtering, and input validation controls in place.
🎯 Exploit Status
SSRF vulnerabilities are commonly exploited and weaponized due to their impact potential.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after commit b2eb99ed304d7491a6d348a5bbdc83a008fc6e0b
Vendor Advisory: https://github.com/amro/gibbon/commit/b2eb99ed304d7491a6d348a5bbdc83a008fc6e0b
Restart Required: No
Instructions:
1. Update Gibbon to the latest version. 2. Apply the security patches from the GitHub commits. 3. Verify the fix by testing SSRF attempts.
🔧 Temporary Workarounds
Input Validation Filter
allImplement strict URL validation to block SSRF attempts
Implement whitelist-based URL validation in application code
Network Egress Filtering
linuxRestrict outbound connections from the server
iptables -A OUTPUT -p tcp --dport 80 -j DROP
iptables -A OUTPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the Gibbon server from sensitive internal systems
- Deploy a web application firewall (WAF) with SSRF protection rules
🔍 How to Verify
Check if Vulnerable:
Check if Gibbon version is 3.4.4 or earlier and test with SSRF payloads to internal servicesCheck Version:
Check Gibbon version in admin panel or configuration filesVerify Fix Applied:
Test with SSRF payloads after patching to confirm they are blocked📡 Detection & Monitoring
Log Indicators:
- Unusual outbound HTTP requests from the server
- Requests to internal IP addresses or metadata services
Network Indicators:
- Unexpected outbound connections from the Gibbon server to internal services
SIEM Query:
source="gibbon" AND (dest_ip=169.254.169.254 OR dest_ip=10.* OR dest_ip=192.168.* OR dest_ip=172.16.*)🔗 References
- https://github.com/amro/gibbon/commit/b2eb99ed304d7491a6d348a5bbdc83a008fc6e0b
- https://github.com/amro/gibbon/commit/cade20ca2438cd1b182dad70cbb77fb895779d10
- https://github.com/amro/gibbon/pull/321
- https://github.com/amro/gibbon/commit/b2eb99ed304d7491a6d348a5bbdc83a008fc6e0b
- https://github.com/amro/gibbon/commit/cade20ca2438cd1b182dad70cbb77fb895779d10
- https://github.com/amro/gibbon/pull/321
