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AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
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CVSS VectorNVD
Lifecycle Timeline
5DescriptionCVE.org
In Canonical LXD versions 4.12 through 6.7, the doCertificateUpdate function in lxd/certificates.go does not validate the Type field when handling PUT/PATCH requests to /1.0/certificates/{fingerprint} for restricted TLS certificate users, allowing a remote authenticated attacker to escalate privileges to cluster admin.
AnalysisAI
Privilege escalation in Canonical LXD 4.12 through 6.7 enables remote authenticated restricted TLS certificate users to gain cluster admin privileges. Exploitation requires high-privilege authentication (PR:H) but no user interaction. The vulnerability stems from missing Type field validation in doCertificateUpdate function when processing PUT/PATCH requests to the certificates API endpoint. Attack scope is changed (S:C), allowing attackers to break containment and achieve full cluster compromise with high impact to confidentiality, integrity, and availability. No public exploit identified at time of analysis.
Technical ContextAI
The doCertificateUpdate function in lxd/certificates.go fails to validate the Type field during certificate modification operations. This CWE-915 (improperly controlled modification of dynamically-determined object attributes) flaw allows authenticated restricted certificate users to manipulate certificate properties via PUT/PATCH to /1.0/certificates/{fingerprint}, bypassing intended access controls and elevating to cluster administrator role. Network-accessible (AV:N), low complexity (AC:L), requiring high privileges (PR:H).
RemediationAI
Vendor-released patch: upstream fix available via GitHub pull request (https://github.com/canonical/lxd/pull/17936); released patched version not independently confirmed at time of analysis. Organizations should monitor Canonical's official security advisory (https://github.com/canonical/lxd/security/advisories/GHSA-c3h3-89qf-jqm5) for release announcements and apply updates immediately upon availability. As an interim mitigation, restrict network access to the LXD API endpoint /1.0/certificates/* to trusted networks only, implement additional authentication layers for certificate management operations, audit existing TLS certificate users for appropriate privilege levels, and revoke restricted certificates if cluster admin escalation risk is unacceptable. Enable comprehensive API request logging to detect unauthorized certificate modification attempts.
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Same technique Privilege Escalation
View allVendor StatusVendor
SUSE
Severity: CriticalShare
External POC / Exploit Code
Leaving vuln.today
EUVD-2026-20876
GHSA-c3h3-89qf-jqm5