CVE-2025-59044
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-09

Last updated on: 2025-09-11

Assigner: GitHub, Inc.

Description
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.
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Meta Information
Published
2025-09-09
Last Modified
2025-09-11
Generated
2026-06-16
AI Q&A
2025-09-10
EPSS Evaluated
2026-06-15
NVD
CVE-2025-59044
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
himmelblau himmelblau 0.9.22
himmelblau himmelblau 1.0.0
himmelblau himmelblau 0.9.0
himmelblau himmelblau 0.9.23
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-1188 The product initializes or sets a resource with a default that is intended to be changed by the product's installer, administrator, or maintainer, but the default is not secure.
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Executive Summary

This vulnerability occurs in Himmelblau versions 0.9.0 through 0.9.22, where numeric GIDs for Microsoft Entra ID groups are derived from the group display name by default. Since Entra ID allows multiple groups to have the same display name, different groups can end up with the same numeric GID on Linux. This causes distinct directory groups to collapse into one GID, potentially allowing unauthorized access to resources that enforce authorization by numeric GID.

Impact Analysis

If you use Himmelblau versions 0.9.0 through 0.9.22, any resource or service on a Himmelblau-joined host that enforces authorization by numeric GID (such as files or directories) can be unintentionally accessible to a user who creates or joins a different Entra/O365 group with the same display name as a privileged security group. This can lead to unauthorized access to sensitive resources.

Detection Guidance

You can detect this vulnerability by checking if your system is running Himmelblau versions 0.9.0 through 0.9.22 and if the configuration file himmelblau.conf has the setting 'id_attr_map = name'. Additionally, verify if any Entra ID groups share the same displayName, which could cause GID collisions. Specific commands are not provided in the available information.

Mitigation Strategies

Immediate mitigation steps include upgrading Himmelblau to version 0.9.23 or 1.0.0 or later, where the group to GID mapping uses Entra ID object IDs (GUIDs) to avoid collisions. As a workaround until all hosts are patched, apply tenant policy hardening to restrict arbitrary group creation.

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