.. _CVE-2021-3524:

CVE-2021-3524: HTTP header injects via CORS in RGW
==================================================

* `NIST information page <https://nvd.nist.gov/vuln/detail/CVE-2021-3524>`_

A flaw was found in the radosgw.  The vulnerability is related to the
injection of HTTP headers via a CORS ExposeHeader tag. The \r
character in the ExposeHeader tag in the CORS configuration file
generates a header injection in the response when the CORS request is
made.

Fixed versions
--------------

* Pacific v16.2.4 (and later)
* Octopus v15.2.12 (and later)
* Nautilus v14.2.21 (and later)

Recommendations
---------------

All users of Ceph object storage (RGW) should upgrade.

Acknowledgements
----------------

Red Hat would like to thank Sergey Bobrov (Kaspersky) for reporting this issue.

