CVE-2016-9463

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Summary

CVECVE-2016-9463
StatePUBLISHED
Assignerhackerone
Source PriorityCVE Program / NVD first with legacy fallback
Published2017-03-28 02:59:00 UTC
Updated2025-04-20 01:37:25 UTC
DescriptionNextcloud 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.

Risk And Classification

Primary CVSS: v3.0 8.1 HIGH from [email protected]

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-303 | CWE-287 | CWE-303 Incorrect Implementation of Authentication Algorithms (CWE-303)

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary8.1HIGHCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary6.8AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:N/AC:M/Au:N/C:P/I:P/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Nextcloud Nextcloud Server All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na 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 affected 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 Not specified

References

ReferenceSourceLinkTags
#148151 SMB User Authentication Bypass and Persistence - HackerOne af854a3a-2127-422b-91ae-364da2661108 hackerone.com Exploit, Third Party Advisory
[stable8.2] Merge pull request #2198 from owncloud/smb-auth-fix · owncloud/apps@a0e07b7 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Issue Tracking, Patch, Third Party Advisory
Double verify the SMB response · nextcloud/apps@b85ace6 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Issue Tracking, Patch, Third Party Advisory
Double verify the SMB response · nextcloud/apps@decb91f · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Issue Tracking, Patch, Third Party Advisory
advisory – Nextcloud af854a3a-2127-422b-91ae-364da2661108 nextcloud.com Patch, Vendor Advisory
[stable9] Merge pull request #2198 from owncloud/smb-auth-fix · owncloud/apps@16cbccf · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Issue Tracking, Patch, Third Party Advisory
Operation OwnedCloud: Exploitation and Post-exploitation Persistence - Rhino Security Labs af854a3a-2127-422b-91ae-364da2661108 rhinosecuritylabs.com Exploit, Technical Description, Third Party Advisory
Merge pull request #2198 from owncloud/smb-auth-fix · owncloud/apps@5d47e7b · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Issue Tracking, Patch, Third Party Advisory
Security Advisories – ownCloud af854a3a-2127-422b-91ae-364da2661108 owncloud.org Patch, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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