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How the CVE Works:
OpenBao’s LDAP authentication with `username_as_alias=true` fails to normalize user-supplied usernames when assigning MFA requirements. Attackers can craft specially formatted usernames (like case variations or Unicode lookalikes) that bypass alias-based MFA enforcement while maintaining valid authentication. The system treats these manipulated usernames as distinct aliases from the properly configured ones, allowing access without required MFA checks despite matching the same underlying identity.
DailyCVE Form:
Platform: OpenBao
Version: <2.3.2
Vulnerability: MFA bypass
Severity: Critical
Date: 2025-08-08
Prediction: Patch by 2025-08-15
What Undercode Say:
$ ldapsearch -x -H ldap://openbao -b "dc=example"
Crafted auth request:
curl -X POST -d '{"username":"Admin\u200B"}'
vault.write('auth/ldap/login', {username: malicious})
How Exploit:
- Craft Unicode/whitespace usernames
- Reuse credentials sans MFA
- Bypass policy enforcement
Protection from this CVE:
- Upgrade to v2.3.2
- Disable username_as_alias
- Normalize aliases manually
Impact:
- MFA completely bypassed
- Policy enforcement failure
- Privilege escalation risk
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Sources:
Reported By: github.com
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