CVE-2016-9461
First published: Tue Mar 28 2017(Updated: )
Nextcloud Server before 9.0.52 & ownCloud Server before 9.0.4 are not properly verifying edit check permissions on WebDAV copy actions. The WebDAV endpoint was not properly checking the permission on a WebDAV COPY action. This allowed an authenticated attacker with access to a read-only share to put new files in there. It was not possible to modify existing files.
Credit: support@hackerone.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Nextcloud Server | <9.0.52 | |
| ownCloud | <9.0.4 |
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Reference Links
- http://www.securityfocus.com/bid/97276
- https://github.com/nextcloud/server/commit/3491400261c1454a9a30d3ec96969573330120cc
- https://github.com/owncloud/core/commit/0622e635d97cb17c5e1363e370bb8268cc3d2547
- https://github.com/owncloud/core/commit/121a3304a0c37ccda0e1b63ddc528cba9121a36e
- https://github.com/owncloud/core/commit/acbbadb71ceee7f01da347f7dcd519beda78cc47
- https://github.com/owncloud/core/commit/c0a4b7b3f38ad2eaf506484b3b92ec678cb021c9
- https://hackerone.com/reports/145950
- https://nextcloud.com/security/advisory/?id=nc-sa-2016-004
- https://owncloud.org/security/advisory/?id=oc-sa-2016-014
Frequently Asked Questions
What is the severity of CVE-2016-9461?
CVE-2016-9461 is classified as a medium severity vulnerability due to improper permission checks.
How do I fix CVE-2016-9461?
To fix CVE-2016-9461, upgrade to Nextcloud Server version 9.0.52 or later, or ownCloud Server version 9.0.4 or later.
Who is affected by CVE-2016-9461?
CVE-2016-9461 affects users of Nextcloud Server versions prior to 9.0.52 and ownCloud Server versions prior to 9.0.4.
What is the main issue with CVE-2016-9461?
The main issue with CVE-2016-9461 is that WebDAV copy actions do not properly verify edit check permissions.
Can CVE-2016-9461 be exploited by attackers?
Yes, an authenticated attacker with access to a read-only share can exploit CVE-2016-9461 to perform unauthorized copy actions.
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