Improper Authentication Affecting pam-himmelblau package, versions <2.3.9+git0.a9fd29b-150700.3.15.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-SLES157-PAMHIMMELBLAU-16090606
- published16 Apr 2026
- disclosed15 Apr 2026
Introduced: 15 Apr 2026
CVE-2025-53013 (opens in a new tab)How to fix?
Upgrade SLES:15.7 pam-himmelblau to version 2.3.9+git0.a9fd29b-150700.3.15.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream pam-himmelblau package and not the pam-himmelblau package as distributed by SLES.
See How to fix? for SLES:15.7 relevant fixed versions and status.
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.
References
- https://www.suse.com/security/cve/CVE-2025-53013.html
- https://bugzilla.suse.com/1245437
- https://github.com/himmelblau-idm/himmelblau/commit/64b03739f1d5ee472b1cff3ed20ed9af1c65a6f8
- https://github.com/himmelblau-idm/himmelblau/commit/78477d684df710d57c10091c87b92665cfac98ae
- https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-j93j-pwm6-p97j
- https://www.vicarius.io/vsociety/posts/cve-2025-53013-detect-himmelblau-vulnerable-configuration
- https://www.vicarius.io/vsociety/posts/cve-2025-53013-mitigate-himmelblau-vulnerable-configuration