A curl security update has been released for Debian GNU/Linux 9 LTS to address an issue where sensitive authentication data may leak to the server that is the target of the second HTTP request.

DLA 2664-1: curl security update

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Debian LTS Advisory DLA-2664-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Sylvain Beucler
May 17, 2021   https://wiki.debian.org/LTS
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Package : curl
Version : 7.52.1-5+deb9u14
CVE ID : CVE-2021-22876
Debian Bug : 986269

Viktor Szakats reported that libcurl, an URL transfer library, does
not strip off user credentials from the URL when automatically
populating the Referer HTTP request header field in outgoing HTTP
requests. Sensitive authentication data may leak to the server that is
the target of the second HTTP request.

For Debian 9 stretch, this problem has been fixed in version
7.52.1-5+deb9u14.

We recommend that you upgrade your curl packages.

For the detailed security status of curl please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/curl

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS