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====================================================================                   
Red Hat Security Advisory

Synopsis:          Important: screen security update
Advisory ID:       RHSA-2021:0742-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:0742
Issue date:        2021-03-08
CVE Names:         CVE-2021-26937
====================================================================
1. Summary:

An update for screen is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Important. 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 Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64

3. Description:

The screen utility allows users to have multiple logins on a single
terminal.

Security Fix(es):

* screen: crash when processing combining chars (CVE-2021-26937)

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.

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

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

1927062 - CVE-2021-26937 screen: crash when processing combining chars

6. Package List:

Red Hat Enterprise Linux Client Optional (v. 7):

Source:
screen-4.1.0-0.27.20120314git3c2946.el7_9.src.rpm

x86_64:
screen-4.1.0-0.27.20120314git3c2946.el7_9.x86_64.rpm
screen-debuginfo-4.1.0-0.27.20120314git3c2946.el7_9.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
screen-4.1.0-0.27.20120314git3c2946.el7_9.src.rpm

x86_64:
screen-4.1.0-0.27.20120314git3c2946.el7_9.x86_64.rpm
screen-debuginfo-4.1.0-0.27.20120314git3c2946.el7_9.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
screen-4.1.0-0.27.20120314git3c2946.el7_9.src.rpm

ppc64:
screen-4.1.0-0.27.20120314git3c2946.el7_9.ppc64.rpm
screen-debuginfo-4.1.0-0.27.20120314git3c2946.el7_9.ppc64.rpm

ppc64le:
screen-4.1.0-0.27.20120314git3c2946.el7_9.ppc64le.rpm
screen-debuginfo-4.1.0-0.27.20120314git3c2946.el7_9.ppc64le.rpm

s390x:
screen-4.1.0-0.27.20120314git3c2946.el7_9.s390x.rpm
screen-debuginfo-4.1.0-0.27.20120314git3c2946.el7_9.s390x.rpm

x86_64:
screen-4.1.0-0.27.20120314git3c2946.el7_9.x86_64.rpm
screen-debuginfo-4.1.0-0.27.20120314git3c2946.el7_9.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
screen-4.1.0-0.27.20120314git3c2946.el7_9.src.rpm

x86_64:
screen-4.1.0-0.27.20120314git3c2946.el7_9.x86_64.rpm
screen-debuginfo-4.1.0-0.27.20120314git3c2946.el7_9.x86_64.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-2021-26937
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2021 Red Hat, Inc.
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