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CVE-2025-53013— Himmelblau offline auth permits authentication with invalid Hello PIN

Quick assessment

Affected
himmelblau-idm himmelblau
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Himmelblau是Himmelblau开源的一个 Azure Entra ID 身份验证模块。 Himmelblau 0.9.10至0.9.16版本存在授权问题漏洞，该漏洞源于离线状态下可使用无效Linux Hello PIN认证。

CVSS 5.2 · Medium EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2025-53013

Vulnerability Information
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Vulnerability Title
Himmelblau offline auth permits authentication with invalid Hello PIN
Source: CVE Program / CVE List V5
Vulnerability Description
Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. A vulnerability present in versions 0.9.10 through 0.9.16 allows a user to authenticate to a Linux host via Himmelblau using an *invalid* Linux Hello PIN, provided the host is offline. While the user gains access to the local system, Single Sign-On (SSO) fails due to the network being down and the inability to issue tokens (due to a failure to unlock the Hello key). The core issue lies in an incorrect assumption within the `acquire_token_by_hello_for_business_key` function: it was expected to return a `TPMFail` error for an invalid Hello key when offline, but instead, a preceding nonce request resulted in a `RequestFailed` error, leading the system to erroneously transition to an offline success state without validating the Hello key unlock. This impacts systems using Himmelblau for authentication when operating in an offline state with Hello PIN authentication enabled. Rocky Linux 8 (and variants) are not affected by this vulnerability. The problem is resolved in Himmelblau version 0.9.17. A workaround is available for users who cannot immediately upgrade. Disabling Hello PIN authentication by setting `enable_hello = false` in `/etc/himmelblau/himmelblau.conf` will mitigate the vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Himmelblau 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Himmelblau是Himmelblau开源的一个 Azure Entra ID 身份验证模块。 Himmelblau 0.9.10至0.9.16版本存在授权问题漏洞，该漏洞源于离线状态下可使用无效Linux Hello PIN认证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
himmelblau-idm himmelblau >= 0.9.10, < 0.9.17 -

II. Public POCs for CVE-2025-53013

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III. Intelligence Information for CVE-2025-53013

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Patches & Fixes for CVE-2025-53013 (1)

IV. Related Vulnerabilities

Same product: himmelblau
Same vendor: himmelblau-idm
Same weakness: CWE-287

V. Comments for CVE-2025-53013

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