Debian: DSA-4306-1 Critical Security Advisory for Python 2.7

Multiple security issues were discovered in Python: ElementTree failed
to initialise Expat's hash salt, two denial of service issues were found
in difflib and poplib and the shutil module was affected by a command
injection vulnerability.

For the stable distribution (stretch), these problems have been fixed in
version 2.7.13-2+deb9u3.

We recommend that you upgrade your python2.7 packages.

For the detailed security status of python2.7 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/python2.7

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