A python-pip security update has been released for Debian GNU/Linux 9 LTS to address a directory traversal attack.

DLA 2370-1: python-pip security update

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Debian LTS Advisory DLA-2370-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
September 11, 2020   https://wiki.debian.org/LTS
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Package : python-pip
Version : 9.0.1-2+deb9u2
CVE ID : CVE-2019-20916

It was discovered that there was a directory traversal attack in pip,
the Python package installer.

When an URL was given in an install command, as a Content-Disposition
header was permitted to have "../" components in their filename,
arbitrary local files (eg. /root/.ssh/authorized_keys) could be
overidden.

For Debian 9 "Stretch", this problem has been fixed in version
9.0.1-2+deb9u2.

We recommend that you upgrade your python-pip packages.

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

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