Arch Linux alert ASA-202102-19 (python-jinja)

From:
             
 
Remi Gacogne via arch-security <arch-security@lists.archlinux.org>
To:
             
 
arch-security@archlinux.org
Subject:
             
 
[ASA-202102-19] python-jinja: denial of service
Date:
             
 
Fri, 12 Feb 2021 08:11:39 +0100
Message-ID:
             
 
<218cb619-89f3-b9a4-573f-1a1b9b46ff83@archlinux.org>
Cc:
             
 
Remi Gacogne <rgacogne@archlinux.org>
Arch Linux Security Advisory ASA-202102-19
==========================================

Severity: Low
Date    : 2021-02-07
CVE-ID  : CVE-2020-28493
Package : python-jinja
Type    : denial of service
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1523

Summary
=======

The package python-jinja before version 2.11.3-1 is vulnerable to
denial of service.

Resolution
==========

Upgrade to 2.11.3-1.

# pacman -Syu "python-jinja>=2.11.3-1"

The problem has been fixed upstream in version 2.11.3.

Workaround
==========

None.

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

A security issue was found in python-jinja before version 2.11.3. The
regular expression denial of service vulnerability is mainly due to the
sub-pattern [a-zA-Z0-9._-]+.[a-zA-Z0-9._-]+ This issue can be mitigated
by Markdown to format user content instead of the urlize filter, or by
implementing request timeouts and limiting process memory.

Impact
======

A remote user might cause a huge CPU utilization via specially crafted
input.

References
==========

https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994
https://github.com/pallets/jinja/pull/1343
https://github.com/pallets/jinja/commit/ef658dc3b6389b091...
https://security.archlinux.org/CVE-2020-28493