Home/CVE/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 Authenti
CVE

CVE-2016-9463

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 Authenti

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.

HIGH · CVSS 8.1 EPSS 0.03864
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-287Improper Authentication
CWE-303Incorrect Implementation of Authentication Algorithm
▤

Affected Products & Versions

5
nextcloud server< 9.0.54
nextcloud server>= 10.0.0 and < 10.0.1
owncloud>= 8.2.0 and < 8.2.9
owncloud>= 9.0.0 and < 9.0.4
owncloud>= 9.1.0 and < 9.1.2
⚠

Public Exploits & PoCs

2
pochackerone.com · 148151hackerone.com
pocrhinosecuritylabs.com · operation-ownedcloud-exploitation-post-exploitation-persi...rhinosecuritylabs.com
▣

Scoring & Timeline

8.1
HIGH · CVSS v3.0 · support@hackerone.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD28 Mar 2017 · 02:59 AM
CVSS VectorCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
🔗

References & Sources

7
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/nextcloud/apps/commit/b85ace6840b8a6704641086bc3b8eb8e81cb2274Issue TrackingPatchThird Party Advisory
https://github.com/nextcloud/apps/commit/decb91fd31f4ffab191cbf09ce4e5c55c67a4087Issue TrackingPatchThird Party Advisory
https://github.com/owncloud/apps/commit/16cbccfc946c8711721fa684d78135ca1fb64791Issue TrackingPatchThird Party Advisory
https://github.com/owncloud/apps/commit/5d47e7b52646cf79edadd78ce10c754290cbb732Issue TrackingPatchThird Party Advisory
https://github.com/owncloud/apps/commit/a0e07b7ddd5a5fd850a6e07f8457d05b76a300b3Issue TrackingPatchThird Party Advisory
https://nextcloud.com/security/advisory/?id=nc-sa-2016-006PatchVendor Advisory
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