CVE-2023-49097
📋 TL;DR
ZITADEL identity infrastructure systems are vulnerable to account takeover via password reset email manipulation. Attackers can inject malicious Forwarded or X-Forwarded-Host headers to redirect password reset links to their own servers, capturing secret codes and resetting user passwords. This affects all ZITADEL users without MFA or passwordless authentication enabled.
💻 Affected Systems
- ZITADEL
📦 What is this software?
Zitadel by Zitadel
Zitadel by Zitadel
Zitadel by Zitadel
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover for all users without MFA/passwordless, potentially leading to full system compromise if admin accounts are affected.
Likely Case
Targeted account takeover of specific users through phishing-style attacks, leading to unauthorized access and potential data breaches.
If Mitigated
No impact for users with MFA or passwordless authentication enabled; limited impact with proper header validation and monitoring.
🎯 Exploit Status
Exploitation requires ability to manipulate HTTP headers in requests to ZITADEL, which can be done through various proxy configurations or direct request manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.41.6, 2.40.10, or 2.39.9
Vendor Advisory: https://github.com/zitadel/zitadel/security/advisories/GHSA-2wmj-46rj-qm2w
Restart Required: Yes
Instructions:
1. Identify your ZITADEL version. 2. Upgrade to 2.41.6, 2.40.10, or 2.39.9 based on your current version track. 3. Restart ZITADEL services. 4. Verify the patch is applied.
🔧 Temporary Workarounds
Enable MFA/Passwordless Authentication
allRequire multi-factor authentication or passwordless authentication for all users, which prevents exploitation of this vulnerability.
Header Validation at Proxy
allConfigure reverse proxies or load balancers to strip or validate Forwarded and X-Forwarded-Host headers before they reach ZITADEL.
🧯 If You Can't Patch
- Enable MFA or passwordless authentication for all user accounts immediately
- Implement strict header validation at network perimeter devices to block malicious Forwarded/X-Forwarded-Host headers
🔍 How to Verify
Check if Vulnerable:
Check ZITADEL version; if below 2.41.6, 2.40.10, or 2.39.9, the system is vulnerable.Check Version:
Check ZITADEL admin interface or deployment configuration for version informationVerify Fix Applied:
Verify ZITADEL version is 2.41.6, 2.40.10, or 2.39.9 or higher, and test password reset functionality with manipulated headers.📡 Detection & Monitoring
Log Indicators:
- Unusual Forwarded or X-Forwarded-Host header values in HTTP logs
- Multiple failed password reset attempts from same source
- Password reset requests with external domains in headers
Network Indicators:
- HTTP requests with manipulated Forwarded/X-Forwarded-Host headers
- Traffic to unexpected domains following password reset requests
SIEM Query:
source="zitadel" AND (header="Forwarded" OR header="X-Forwarded-Host") AND value NOT IN [allowed_domains]