advisories/nc-sa-2020-024.php


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    <h1>Security Advisory</h1>
    <a href="/security/advisories/">Back to advisories</a>
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        <h2>Limit contacts photo uploading to images (NC-SA-2020-024)</h2>
        <p>16th April 2020</p>
        <p>Risk level: <strong>Low</strong></p>
        <p>CVSS v3 Base Score: 2.6 (<a href="https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N">AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N</a>)</p>
        <p>CWE: <a href="https://cwe.mitre.org/data/definitions/840.html">Business Logic Errors (CWE-840)</a></p>
        <p>HackerOne report: <a href="https://hackerone.com/reports/808287">808287</a></p>
        <h3>Description</h3>
        <p>A missing file type check in Nextcloud Contacts 3.2.0 allowed a malicious user to upload any file as avatars.</p>
        <h3>Affected Software</h3>
        <ul>
            <li>Nextcloud Contacts &lt; <strong>3.3.0</strong> (CVE-2020-8181)</li>

        </ul>
        <h3>Action Taken</h3>
        <p>The error has been fixed.</p>
        <h3>Resolution</h3>
        <p>It is recommended that the Nextcloud Contacts is upgraded to 3.3.0.</p>
        <h3>Acknowledgements</h3>
        <p>The Nextcloud team thanks the following people for their research and responsible disclosure of the above advisory:</p>
        <ul>
            <li>Tommy Suriel - Vulnerability discovery and disclosure.</li>
        </ul>
        <br/>
        <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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