An apache2 security update has been released for Debian GNU/Linux 9 LTS to address two vulnerabilities.

DLA 2907-1: apache2 security update

- -------------------------------------------------------------------------
Debian LTS Advisory DLA-2907-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Anton Gladky
February 01, 2022   https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package : apache2
Version : 2.4.25-3+deb9u12
CVE ID : CVE-2021-44224 CVE-2021-44790

Two vulnerabilities have been discovered in the Apache HTTP server:

CVE-2021-44224

When operating as a forward proxy, Apache was depending on the setup
suspectable to denial of service or Server Side Request forgery.

CVE-2021-44790

A buffer overflow in mod_lua may result in denial of service or potentially
the execution of arbitrary code.

For Debian 9 stretch, these problems have been fixed in version
2.4.25-3+deb9u12.

We recommend that you upgrade your apache2 packages.

For the detailed security status of apache2 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/apache2

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