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Disclosure</p><p>Severity: High</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="versions-affected">Versions Affected:<a href="#versions-affected" class="hash-link" aria-label="Direct link to Versions Affected:" title="Direct link to Versions Affected:"></a></h2><p>Apache Pulsar < 2.7.1</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="description">Description:<a href="#description" class="hash-link" aria-label="Direct link to Description:" title="Direct link to Description:"></a></h2><p>If Apache Pulsar is configured to authenticate clients using tokens |
| based on JSON Web Tokens (JWT), the signature of the token is not |
| validated if the algorithm of the presented token is set to "none". |
| This allows an attacker to connect to Pulsar instances as any user |
| (incl. admins).</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="mitigation">Mitigation:<a href="#mitigation" class="hash-link" aria-label="Direct link to Mitigation:" title="Direct link to Mitigation:"></a></h2><p>Users of the affected versions should apply one of the following |
| mitigations: |
| Upgrade to Apache Pulsar 2.7.1 or later</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="credit">Credit:<a href="#credit" class="hash-link" aria-label="Direct link to Credit:" title="Direct link to Credit:"></a></h2><p>This issue was identified by Peter Stöckli</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="related-links">RELATED LINKS:<a href="#related-links" class="hash-link" aria-label="Direct link to RELATED LINKS:" title="Direct link to RELATED LINKS:"></a></h2><ul><li><a href="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22160" target="_blank" rel="noopener noreferrer">CVE-2021-22160 at cve.mitre.org</a></li><li><a href="https://lists.apache.org/thread/c92qg26o2859jv7m7nrv74ydyrjgzql0" target="_blank" rel="noopener noreferrer">https://lists.apache.org/thread/c92qg26o2859jv7m7nrv74ydyrjgzql0</a></li></ul><p><a href="/security/">Security Advisories</a></p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages 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