- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 202107-19
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                           https://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

 Severity: Low
    Title: Jinja: Denial of service
     Date: July 08, 2021
     Bugs: #768300
       ID: 202107-19

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

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
security@gentoo.org 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/