A php7.0 security update has been released for Debian GNU/Linux 9 LTS to address an issue where an attacker can forge a cookie.

DLA 2397-1: php7.0 security update

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Debian LTS Advisory DLA-2397-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Roberto C. Sánchez
October 06, 2020   https://wiki.debian.org/LTS
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Package : php7.0
Version : 7.0.33-0+deb9u10
CVE ID : CVE-2020-7070

A vulnerability was discovered in PHP, a server-side, HTML-embedded
scripting language. When PHP is processing incoming HTTP cookie values,
the cookie names are url-decoded. This may lead to cookies with prefixes
like __Host confused with cookies that decode to such prefix, thus
leading to an attacker being able to forge a cookie which is supposed to
be secure.

For Debian 9 stretch, this problem has been fixed in version
7.0.33-0+deb9u10.

We recommend that you upgrade your php7.0 packages.

For the detailed security status of php7.0 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/php7.0

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