CVE Catalog

CVE-2025-59044

MediumCVSS 4.4
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.15%

3th percentile - higher than 3% of all known CVEs

Summary

Himmelblau 0.9.x derives numeric GIDs for Entra ID groups from the group display name when himmelblau.conf `id_attr_map = name` (the default configuration). Because Microsoft Entra ID allows multiple groups with the same displayName, distinct directory groups can collapse to the same numeric GID on Linux, potentially allowing unintentional access to resources or services that enforce authorization by numeric GID.

Risk Assessment

The vulnerability could allow unauthorized access to resources and services on a Himmelblau-joined host if a user creates or joins a group with the same displayName as a privileged group. This impacts confidentiality and integrity.

Recommendation

Upgrade Himmelblau to 0.9.23, or 1.0.0 or later. As a workaround, use tenant policy hardening to restrict arbitrary group creation until all hosts are patched.

Related vulnerabilities

Original NVD description (English source)

Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. Himmelblau 0.9.x derives numeric GIDs for Entra ID groups from the group display name when himmelblau.conf `id_attr_map = name` (the default configuration). Because Microsoft Entra ID allows multiple groups with the same `displayName` (including end-user–created personal/O365 groups, depending on tenant policy), distinct directory groups can collapse to the same numeric GID on Linux. This issue only applies to Himmelblau versions 0.9.0 through 0.9.22. Any resource or service on a Himmelblau-joined host that enforces authorization by numeric GID (files/dirs, etc.) can be unintentionally accessible to a user who creates or joins a different Entra/O365 group that happens to share the same `displayName` as a privileged security group. Users should upgrade to 0.9.23, or 1.0.0 or later, to receive a patch. Group to GID mapping now uses Entra ID object IDs (GUIDs) and does not collide on same-name groups. As a workaround, use tenant policy hardening to restrict arbitrary group creation until all hosts are patched.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS