An adminer security update has been released for Debian GNU/Linux 9 LTS to address an Arbitrary File Read.

DLA 3002-1: adminer security update

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Debian LTS Advisory DLA-3002-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
May 13, 2022   https://wiki.debian.org/LTS
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Package : adminer
Version : 4.2.5-3+deb9u3
CVE ID : CVE-2021-43008

It was discovered that there was an issue in the web-based database
tool Adminer whereby an attacker could have performed an Arbitrary
File Read on the remote server by requesting Adminer connect to a
crafted remote MySQL database.

For Debian 9 "Stretch", this problem has been fixed in version
4.2.5-3+deb9u3.

We recommend that you upgrade your adminer packages.

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

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