Affected: Bitnami: openbao

OpenBao exists to provide a software solution to manage, store, and distribute sensitive data including secrets, certificates, and keys. In versions 2.3.1 and below, OpenBao allowed the assignment of policies and MFA attribution based upon entity aliases, chosen by the underlying auth method. When the username_as_alias=true parameter in the LDAP auth method was in use, the caller-supplied username was used verbatim without normalization, allowing an attacker to bypass alias-specific MFA requirements. This issue was fixed in version 2.3.2. To work around this, remove all usage of the username_as_alias=true parameter and update any entity aliases accordingly.

OpenBao exists to provide a software solution to manage, store, and distribute sensitive data including secrets, certificates, and keys. In versions 2.3.1 and below, OpenBao allowed the assignment of policies and MFA attribution based upon entity aliases, chosen by the underlying auth method. When the username_as_alias=true parameter in the LDAP auth method was in use, the caller-supplied username was used verbatim without normalization, allowing an attacker to bypass alias-specific MFA requirements. This issue was fixed in version 2.3.2. To work around this, remove all usage of the username_as_alias=true parameter and update any entity aliases accordingly.

Affected: Go: github.com/openbao/openbao

### Impact

OpenBao allows assignment of policies and MFA attribution based upon entity aliases, chosen by the underlying auth method. When using the `username_as_alias=true` parameter in the LDAP auth method, the caller-supplied username is used verbatim without normalization, allowing an attacker to bypass alias-specific MFA requirements.

### Patches

OpenBao v2.3.2 will patch this issue.

### Workarounds

LDAP methods are only vulnerable if using `username_as_alias=true`. Remove all usage of this parameter and update any entity aliases accordingly.

### References

This issue was disclosed to HashiCorp and is the OpenBao equivalent of the following tickets:

- https://discuss.hashicorp.com/t/hcsec-2025-20-vault-ldap-mfa-enforcement-bypass-when-using-username-as-alias/76092 - https://nvd.nist.gov/vuln/detail/CVE-2025-6013

govulncheck-vulndb-0.0.20250811T192933-1.1 on GA media

Ein entfernter, authentisierter oder anonymer Angreifer kann mehrere Schwachstellen in OpenBao ausnutzen, um beliebigen Code auszuführen, Root-Rechte zu erlangen, Sicherheitsmaßnahmen zu umgehen und vertrauliche Informationen offenzulegen.