CVE-2016-9463
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
- Exploit odds
- 4.1% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 4.1% in the next 30 days (EPSS).
- Severity: 8.1 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 4.1% · EPSS, next 30 days
- Weakness
- CWE-303
- Record status
- Modified
Affected
- Nextcloud Server < 9.0.54
- Nextcloud Server < 10.0.1
- Owncloud < 8.2.9
- Owncloud < 9.0.4
- Owncloud < 9.1.2
Attack profile CVSS 3.0 · 8.1
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Raw vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2016-9463.md and follow it. Check whether this project is affected by CVE-2016-9463. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- 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://nextcloud.com/security/advisory/?id=nc-sa-2016-006
- https://owncloud.org/security/advisory/?id=oc-sa-2016-017
- https://github.com/nextcloud/apps/commit/b85ace6840b8a6704641086bc3b8eb8e81cb2274
- https://github.com/nextcloud/apps/commit/decb91fd31f4ffab191cbf09ce4e5c55c67a4087
- https://github.com/owncloud/apps/commit/16cbccfc946c8711721fa684d78135ca1fb64791
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/