Description
Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. Prior to 3.1.0 and 2.3.8, the himmelblaud-tasks daemon, running as root, writes Kerberos cache files under /tmp/krb5cc_<uid> without symlink protections. Since commit 87a51ee, PrivateTmp is explicitly removed from the tasks daemon's systemd hardening, exposing it to the host /tmp. A local user can exploit this via symlink attacks to chown or overwrite arbitrary files, achieving local privilege escalation. This vulnerability is fixed in 3.1.0 and 2.3.8.
References (1)
Core 1
Core References
Vendor Advisory x_refsource_confirm
https://github.com/himmelblau-idm/himmelblau/security/advisories/GHSA-44wm-q286-ghq3
Scores
CVSS v3
8.8
EPSS
0.0020
EPSS Percentile
9.4%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
total
Details
CWE
CWE-59
Status
published
Products (1)
himmelblau-idm/himmelblau
1.0.0 - 2.3.8
Published
Mar 11, 2026
Tracked Since
Mar 12, 2026