CVE-2024-10318
📋 TL;DR
A session fixation vulnerability in NGINX OpenID Connect reference implementation allows attackers to bind a victim's session to an attacker-controlled account by exploiting missing nonce validation during login. This affects systems using NGINX OpenID Connect reference implementation for authentication. Although attackers cannot directly impersonate victims, they can hijack sessions to access resources under attacker-controlled accounts.
💻 Affected Systems
- NGINX OpenID Connect Reference Implementation
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Victim sessions are permanently associated with attacker-controlled accounts, allowing attackers to monitor victim activity, access resources the victim accesses through the compromised session, and potentially escalate privileges if victim has higher permissions.
Likely Case
Attackers fix sessions to monitor victim activity and access resources available to the attacker-controlled account, potentially leading to data leakage or unauthorized actions.
If Mitigated
With proper session management and monitoring, impact is limited to temporary session hijacking that can be detected and terminated.
🎯 Exploit Status
Exploitation requires the attacker to have an account in the system and the ability to initiate authentication requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check F5 advisory for specific patched versions
Vendor Advisory: https://my.f5.com/manage/s/article/K000148232
Restart Required: Yes
Instructions:
1. Review F5 advisory K000148232. 2. Update NGINX OpenID Connect reference implementation to patched version. 3. Restart NGINX service. 4. Verify nonce validation is enforced.
🔧 Temporary Workarounds
Implement Session Regeneration
allRegenerate session IDs after successful authentication to prevent session fixation
# Configure NGINX to regenerate session IDs
proxy_set_header X-Session-New "true";
Add Nonce Validation
linuxManually implement nonce validation in authentication flow
# Add nonce validation in OpenID Connect configuration
auth_request_set $nonce $upstream_http_x_nonce;
if ($nonce != $cookie_nonce) { return 403; }
🧯 If You Can't Patch
- Implement additional session validation checks in application layer
- Monitor authentication logs for suspicious session binding patterns
🔍 How to Verify
Check if Vulnerable:
Check if NGINX OpenID Connect implementation validates nonce parameter during authentication by reviewing configuration files and testing authentication flow.Check Version:
nginx -v 2>&1 | grep -i openidVerify Fix Applied:
Test authentication flow to ensure nonce validation occurs and session IDs change after successful login.📡 Detection & Monitoring
Log Indicators:
- Multiple authentication attempts with same session ID
- Session IDs not changing after successful login
- Nonce parameter missing or mismatched in authentication logs
Network Indicators:
- Repeated authentication requests from same source with different accounts
- Suspicious redirect patterns during OAuth/OpenID Connect flow
SIEM Query:
source="nginx" AND (event="authentication" OR event="session") AND (nonce="" OR session_id_reuse=true)