vulnwire
8.1high

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 Authentication Bypass.

Published 9 y ago · modified 4 mo ago · JSON

CVSS
8.1
v3.0 · NVD
CISA KEV
No
not known exploited
EPSS
4.1%
percentile 91%
Public exploits
0
none known

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.

Exploit prediction (EPSS)

4.09% probability of exploitation in the next 30 days, higher than 91% of all scored CVEs.

CVSS scores

Assigned byVersionScoreVector
NVD3.08.1CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD2.06.8AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • n/a Nextcloud Server & ownCloud Server Nextcloud Server before 9.0.54 and 10.0.1 & ownCloud Server before 9.1.2, 9.0.6, and 8.2.9

Classification

Weakness
  • CWE-303 Incorrect Implementation of Authentication Algorithm
  • CWE-287 Improper Authentication

References

  • github.com /nextcloud/apps/commit/b85ace6840b8a6704641086bc3b8eb8e81cb2274 · x_refsource_MISC, x_transferred
  • github.com /owncloud/apps/commit/16cbccfc946c8711721fa684d78135ca1fb64791 · x_refsource_MISC, x_transferred
  • rhinosecuritylabs.com /2016/10/operation-ownedcloud-exploitation-post-exploitation-persistence/ · x_refsource_MISC, x_transferred
  • github.com /owncloud/apps/commit/5d47e7b52646cf79edadd78ce10c754290cbb732 · x_refsource_MISC, x_transferred
  • github.com /owncloud/apps/commit/a0e07b7ddd5a5fd850a6e07f8457d05b76a300b3 · x_refsource_MISC, x_transferred
  • hackerone.com /reports/148151 · x_refsource_MISC, x_transferred
  • github.com /nextcloud/apps/commit/decb91fd31f4ffab191cbf09ce4e5c55c67a4087 · x_refsource_MISC, x_transferred
  • owncloud.org /security/advisory/?id=oc-sa-2016-017 · x_refsource_MISC, x_transferred
  • nextcloud.com /security/advisory/?id=nc-sa-2016-006 · x_refsource_MISC, x_transferred

Sources

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