CVE-2025-55000
📋 TL;DR
OpenBao's TOTP secrets engine in versions 0.1.0 through 2.3.1 allows TOTP codes to be reused multiple times due to normalization issues in the underlying library. This affects systems using OpenBao for TOTP-based authentication or secret management. Attackers with access to valid TOTP codes could potentially bypass one-time code protections.
💻 Affected Systems
- OpenBao
📦 What is this software?
Openbao by Openbao
⚠️ Risk & Real-World Impact
Worst Case
Attackers could reuse intercepted TOTP codes to gain unauthorized access to protected systems or secrets, potentially leading to privilege escalation or data breaches.
Likely Case
In environments with proper access controls, the impact is limited to systems where attackers can intercept or generate valid TOTP codes and have network access to OpenBao endpoints.
If Mitigated
With proper network segmentation and access controls limiting TOTP verification to trusted systems only, the impact is minimal as code interception becomes difficult.
🎯 Exploit Status
Exploitation requires access to valid TOTP codes and network access to OpenBao TOTP endpoints. The attacker needs to understand the normalization behavior to reuse codes.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.3.2 or later
Vendor Advisory: https://github.com/openbao/openbao/security/advisories/GHSA-f7c3-mhj2-9pvg
Restart Required: No
Instructions:
1. Upgrade OpenBao to version 2.3.2 or later. 2. No restart required - the fix is applied immediately upon upgrade. 3. Verify the fix by testing TOTP code verification.
🔧 Temporary Workarounds
Normalize TOTP codes before submission
allImplement client-side normalization of TOTP codes before sending them to OpenBao endpoints to prevent code reuse.
🧯 If You Can't Patch
- Restrict network access to OpenBao TOTP endpoints to only trusted systems
- Implement additional authentication factors alongside TOTP verification
🔍 How to Verify
Check if Vulnerable:
Check OpenBao version: if running 0.1.0 through 2.3.1 with TOTP engine enabled, the system is vulnerable.Check Version:
openbao versionVerify Fix Applied:
After upgrading to 2.3.2+, test TOTP code verification - valid codes should only work once.📡 Detection & Monitoring
Log Indicators:
- Multiple successful TOTP verifications with the same code
- Unusual TOTP verification patterns from single sources
Network Indicators:
- Repeated TOTP verification requests with identical payloads
- TOTP verification traffic from unexpected sources
SIEM Query:
source="openbao" AND (event="totp_verification" AND result="success") | stats count by code, source_ip | where count > 1