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Gentoo Linux Security Advisory                           GLSA 202107-19
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                                           https://security.gentoo.org/
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 Severity: Low
    Title: Jinja: Denial of service
     Date: July 08, 2021
     Bugs: #768300
       ID: 202107-19

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Synopsis
========

An inefficient regular expression could be exploited to cause a Denial
of Service condition.

Background
==========

Jinja is a template engine written in pure Python.

Affected packages
=================

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  dev-python/jinja             < 2.11.3                  >= 2.11.3 

Description
===========

The 'urlize' filter in Jinja utilized an inefficient regular expression
that could be exploited to consume excess CPU.

Impact
======

An attacker could cause a Denial of Service condition via crafted input
to the 'urlize' Jinja filter.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Jinja users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=dev-python/jinja-2.11.3"

References
==========

[ 1 ] CVE-2020-28493
      https://nvd.nist.gov/vuln/detail/CVE-2020-28493

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

 https://security.gentoo.org/glsa/202107-19

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
[email protected] or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2021 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5