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      <title>CVE-2026-34397 — himmelblau: NSS fake-primary group lookup reintroduces name collision risk</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-34397</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; himmelblau-idm himmelblau&lt;/p&gt;
&lt;p&gt;Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. From versions 2.0.0-alpha to before 2.3.9 and 3.0.0-alpha to before 3.1.1, there is a conditional local privilege escalation vulnerability in an edge-case naming collision. Only authenticated himmelblau users whose mapped CN/short name exactly matches a privileged local group name (e.g., &amp;#34;sudo&amp;#34;, &amp;#34;wheel&amp;#34;, &amp;#34;docker&amp;#34;, &amp;#34;adm&amp;#34;) can cause the NSS module to resolve that group name to their fake primary group. If the system uses NSS results for group-based authorization decisions (sudo, polkit, etc.), this can grant the attacker the privileges of that group. This issue has been patched in versions 2.3.9 and 3.1.1.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; himmelblau-idm himmelblau&lt;/p&gt;
&lt;p&gt;Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. From versions 2.0.0-alpha to before 2.3.9 and 3.0.0-alpha to before 3.1.1, there is a conditional local privilege escalation vulnerability in an edge-case naming collision. Only authenticated himmelblau users whose mapped CN/short name exactly matches a privileged local group name (e.g., &amp;#34;sudo&amp;#34;, &amp;#34;wheel&amp;#34;, &amp;#34;docker&amp;#34;, &amp;#34;adm&amp;#34;) can cause the NSS module to resolve that group name to their fake primary group. If the system uses NSS results for group-based authorization decisions (sudo, polkit, etc.), this can grant the attacker the privileges of that group. This issue has been patched in versions 2.3.9 and 3.1.1.&lt;/p&gt;</content:encoded>
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