CVE-2016-9463
Description
Nextcloud Server before 9.0.54 and 10.0.1 & ownCloud Server before 9.1.2, 9.0.6, and 8.2.9 suffer from SMB User Authentication Bypass. Nextcloud/ownCloud include an optional and not by default enabled SMB authentication component that allows authenticating users against an SMB server. This backend is implemented in a way that tries to connect to a SMB server and if that succeeded consider the user logged-in. The backend did not properly take into account SMB servers that have any kind of anonymous auth configured. This is the default on SMB servers nowadays and allows an unauthenticated attacker to gain access to an account without valid credentials. Note: The SMB backend is disabled by default and requires manual configuration in the Nextcloud/ownCloud config file. If you have not configured the SMB backend then you're not affected by this vulnerability.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| nextcloud | nextcloud_server | {"endExcluding":"9.0.54"} | 9.0.54 |
| owncloud | owncloud | {"startIncluding":"8.2.0","endExcluding":"8.2.9"} | 8.2.9 |
References
- https://github.com/nextcloud/apps/commit/b85ace6840b8a6704641086bc3b8eb8e81cb2274
- https://github.com/nextcloud/apps/commit/decb91fd31f4ffab191cbf09ce4e5c55c67a4087
- https://github.com/owncloud/apps/commit/16cbccfc946c8711721fa684d78135ca1fb64791
- https://github.com/owncloud/apps/commit/5d47e7b52646cf79edadd78ce10c754290cbb732
- https://github.com/owncloud/apps/commit/a0e07b7ddd5a5fd850a6e07f8457d05b76a300b3
- https://hackerone.com/reports/148151
- https://nextcloud.com/security/advisory/?id=nc-sa-2016-006
- https://owncloud.org/security/advisory/?id=oc-sa-2016-017
- https://rhinosecuritylabs.com/2016/10/operation-ownedcloud-exploitation-post-exploitation-persistence/
- https://github.com/nextcloud/apps/commit/b85ace6840b8a6704641086bc3b8eb8e81cb2274
- https://github.com/nextcloud/apps/commit/decb91fd31f4ffab191cbf09ce4e5c55c67a4087
- https://github.com/owncloud/apps/commit/16cbccfc946c8711721fa684d78135ca1fb64791
- https://github.com/owncloud/apps/commit/5d47e7b52646cf79edadd78ce10c754290cbb732
- https://github.com/owncloud/apps/commit/a0e07b7ddd5a5fd850a6e07f8457d05b76a300b3
- https://hackerone.com/reports/148151
- https://nextcloud.com/security/advisory/?id=nc-sa-2016-006
- https://owncloud.org/security/advisory/?id=oc-sa-2016-017
- https://rhinosecuritylabs.com/2016/10/operation-ownedcloud-exploitation-post-exploitation-persistence/
CWEs
CWE-303 CWE-287
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.