[RHSA-2021:4161-02] Moderate: python-jinja2 security update

[Security announcements for all Red Hat products and services.]

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                   Red Hat Security Advisory

Synopsis:          Moderate: python-jinja2 security update
Advisory ID:       RHSA-2021:4161-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:4161
Issue date:        2021-11-09
CVE Names:         CVE-2020-28493 
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1. Summary:

An update for python-jinja2 is now available for Red Hat Enterprise Linux
8.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AppStream (v. 8) - noarch

3. Description:

The python-jinja2 package contains Jinja2, a template engine written in
pure Python. Jinja2 provides a Django inspired non-XML syntax but supports
inline expressions and an optional sandboxed environment. 

Security Fix(es):

* python-jinja2: ReDoS vulnerability due to the sub-pattern
(CVE-2020-28493)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 8.5 Release Notes linked from the References section.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

For the update to take effect, all applications using Jinja2 must be
restarted.

5. Bugs fixed (https://bugzilla.redhat.com/):

1928707 - CVE-2020-28493 python-jinja2: ReDoS vulnerability in the urlize filter

6. Package List:

Red Hat Enterprise Linux AppStream (v. 8):

Source:
python-jinja2-2.10.1-3.el8.src.rpm

noarch:
python3-jinja2-2.10.1-3.el8.noarch.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2020-28493
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.5_release_notes/

8. Contact:

The Red Hat security contact is <secalert at redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2021 Red Hat, Inc.
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