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How the CVE Works
The vulnerability in OpenBao’s MFA system stems from improper normalization of TOTP tokens. The underlying library accepts whitespace characters within TOTP codes, which bypasses rate-limiting checks. Attackers can reuse valid tokens by injecting whitespace, allowing repeated authentication attempts without triggering security throttling. This flaw enables brute-force attacks against MFA-protected accounts despite rate-limiting defenses.
DailyCVE Form
Platform: OpenBao
Version: <2.3.2
Vulnerability: TOTP bypass
Severity: Critical
Date: 2025-08-08
Prediction: Patch by 2025-08-15
What Undercode Say
curl -X POST 'https://openbao/api/auth/login' -d '{"token":"valid_token "}'
def exploit_totp(token): return token + " " Whitespace injection
How Exploit
1. Capture valid TOTP token
2. Append whitespace to token
3. Reuse modified token repeatedly
4. Bypass rate-limiting
Protection from this CVE
1. Upgrade to OpenBao 2.3.2
2. Enforce rate-limiting quotas
3. Monitor auth logs
Impact
- MFA bypass
- Account takeover
- Brute-force escalation
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Sources:
Reported By: github.com
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