advisories/nc-sa-2019-003.php


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

<div class="row page-content-header">
<div class="col-md-12">
    <h1>Security Advisory</h1>
    <a href="/security/advisories/">Back to advisories</a>
</div>
</div>
<div class="row">
    <div class="col-md-12">
        <h2>Improper share updates could result in extended data access (NC-SA-2019-003)</h2>
        <p>12th April 2019</p>
        <p>Risk level: <strong>Low</strong></p>
        <p>CVSS v3 Base Score: 9.6 (<a href="https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N">AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N</a>)</p>
        <p>CWE: <a href="https://cwe.mitre.org/data/definitions/284.html">Improper Access Control - Generic (CWE-284)</a></p>
        <p>HackerOne report: <a href="https://hackerone.com/reports/452854">452854</a></p>
        <h3>Description</h3>
        <p>A bug could expose more data in reshared link shares than intended by the sharer.</p>
        <h3>Affected Software</h3>
        <ul>
            <li>Nextcloud Server &lt; <strong>15.0.0</strong> (CVE-2020-8121)</li>
<li>Nextcloud Server &lt; <strong>14.0.5</strong> (CVE-2020-8121)</li>
<li>Nextcloud Server &lt; <strong>13.0.9</strong> (CVE-2020-8121)</li>

        </ul>
        <h3>Action Taken</h3>
        <p>The error has been fixed.</p>
        <h3>Resolution</h3>
        <p>It is recommended that all instances are upgraded to Nextcloud 15.0.0, 14.0.5 or 13.0.9.</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>Fabian Riechsteiner - recretix systems AG - 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>
    </div>
</div>