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CVE-2016-9463

8.1 · HIGH

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 Mar 28, 2017CWE-303EPSS 4.09%

Overview

CVE-2016-9463 is a high-severity vulnerability. It was published on March 28, 2017 and has a CVSS 3.0 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.0 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/nextcloud/apps/commit/b85ace6840b8a6704641086bc3b8eb8e81cb2274GitHubgithub.com/nextcloud/apps/commit/decb91fd31f4ffab191cbf09ce4e5c55c67a4087GitHubgithub.com/owncloud/apps/commit/16cbccfc946c8711721fa684d78135ca1fb64791GitHubgithub.com/owncloud/apps/commit/5d47e7b52646cf79edadd78ce10c754290cbb732GitHubgithub.com/owncloud/apps/commit/a0e07b7ddd5a5fd850a6e07f8457d05b76a300b3Refhackerone.com/reports/148151Refnextcloud.com/security/advisory/?id=nc-sa-2016-006Refowncloud.org/security/advisory/?id=oc-sa-2016-017Refrhinosecuritylabs.com/2016/10/operation-ownedcloud-exploitation-post-exploitation-persistence/GitHubgithub.com/nextcloud/apps/commit/b85ace6840b8a6704641086bc3b8eb8e81cb2274

How CyberStrike helps

Frequently asked questions

What is CVE-2016-9463?

CVE-2016-9463 is a high-severity vulnerability. It was published on March 28, 2017 and has a CVSS 3.0 base score of 8.1 (HIGH).

How severe is CVE-2016-9463?

This vulnerability has a CVSS 3.0 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2016-9463?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2016-9463?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-9463 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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