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<h1>Security Advisory</h1>
<a href="/security/advisories/">Back to advisories</a>
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<h2>Creation of folders in read-only folders despite lacking permissions (NC-SA-2017-002)</h2>
<p>5th February 2017</p>
<p>Risk level: <strong>Low</strong></p>
<p>CVSS v3 Base Score: 4.1 (<a href="https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N">AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N</a>)</p>
<p>CWE: <a href="https://cwe.mitre.org/data/definitions/275.html">Permission Issues (CWE-275)</a></p>
<p>HackerOne report: <a href="https://hackerone.com/reports/169680">169680</a></p>
<h3>Description</h3>
<p><p>Due to a logical error in the file caching layer an authenticated adversary is able to create empty folders inside a shared folder.</p>
<p>Note that this only affects folders and files that the adversary has at least read-only permissions for.</p>
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<h3>Affected Software</h3>
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<li>Nextcloud Server < <strong>10.0.2</strong> (CVE-2017-0884)</li>
<li>Nextcloud Server < <strong>9.0.55</strong> (CVE-2017-0884)</li>
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<h3>Action Taken</h3>
<p><p>The file cache operation is now only performed if the file system operation succeeded.</p>
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<h3>Acknowledgements</h3>
<p>The Nextcloud team thanks the following people for their research and responsible disclosure of the above advisory:</p>
<ul>
<li><a href="https://secator.com/" target="_blank" rel="noreferrer">secator - Vulnerability discovery and disclosure.</a></li>
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<small style="color:grey">This advisory is licensed <a href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.</small>
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