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<h1>Security Advisory</h1>
<a href="/security/advisories/">Back to advisories</a>
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<h2>Error message discloses existence of file in write-only share (NC-SA-2017-003)</h2>
<p>5th February 2017</p>
<p>Risk level: <strong>Low</strong></p>
<p>CVSS v3 Base Score: 3.7 (<a href="https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:L">AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:L</a>)</p>
<p>CWE: <a href="https://cwe.mitre.org/data/definitions/209.html">Information Exposure Through an Error Message (CWE-209)</a></p>
<p>HackerOne report: <a href="https://hackerone.com/reports/174524">174524</a></p>
<h3>Description</h3>
<p><p>Due to an error in the application logic an adversary with access to a write-only share may enumerate the names of existing files and subfolders by comparing the exception messages.</p>
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<h3>Affected Software</h3>
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<li>Nextcloud Server < <strong>10.0.2</strong> (CVE-2017-0885)</li>
<li>Nextcloud Server < <strong>9.0.55</strong> (CVE-2017-0885)</li>
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<h3>Action Taken</h3>
<p><p>The error in the application logic has been addressed.</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>
</ul>
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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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