CVE-2025-49012

Description

Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. Himmelblau versions 0.9.0 through 0.9.14 and 1.00-alpha are vulnerable to a privilege escalation issue when Entra ID group-based access restrictions are configured using group display names instead of object IDs. Starting in version 0.9.0, Himmelblau introduced support for specifying group names in the `pam_allow_groups` configuration option. However, Microsoft Entra ID permits the creation of multiple groups with the same `displayName` via the Microsoft Graph API—even by non-admin users, depending on tenant settings. As a result, a user could create a personal group with the same name as a legitimate access group (e.g., `"Allow-Linux-Login"`), add themselves to it, and be granted authentication or `sudo` rights by Himmelblau. Because affected Himmelblau versions compare group names by either `displayName` or by the immutable `objectId`, this allows bypassing access control mechanisms intended to restrict login to members of official, centrally-managed groups. This issue is fixed in Himmelblau version **0.9.15** and later. In these versions, group name matching in `pam_allow_groups` has been deprecated and removed, and only group `objectId`s (GUIDs) may be specified for secure group-based filtering. To mitigate the issue without upgrading, replace all entries in `pam_allow_groups` with the objectId of the target Entra ID group(s) and/or audit your tenant for groups with duplicate display names using the Microsoft Graph API.

Reserved 2025-05-29 | Published 2025-06-05 | Updated 2025-06-09 | Assigner GitHub_M

Problem types

CWE-287: Improper Authentication

Product status

>= 0.9.0, < 0.9.15
affected

= 1.0.0-alpha
affected

References

github.com/...elblau/security/advisories/GHSA-gcxr-m95v-qcf7

github.com/himmelblau-idm/himmelblau/issues/554

github.com/...ommit/918577f6a8392a71d9d3d67f20962c372a0c01c6

learn.microsoft.com/...-same-name-usi?utm_source=chatgpt.com

cve.org (CVE-2025-49012)

nvd.nist.gov (CVE-2025-49012)

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