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Red Hat Security Advisory 2020-1335-01

Red Hat Security Advisory 2020-1335-01
Posted Apr 6, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-1335-01 - Telnet is a popular protocol for logging in to remote systems over the Internet. The telnet-server packages include a telnet service that supports remote logins into the host machine. The telnet service is disabled by default. An arbitrary code execution vulnerability was addressed.

tags | advisory, remote, arbitrary, code execution, protocol
systems | linux, redhat
advisories | CVE-2020-10188
SHA-256 | daffcb8a8a981a2595f69a4544cfb3ea934971af45e409786b6a746d3888420a

Red Hat Security Advisory 2020-1335-01

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

Synopsis: Important: telnet security update
Advisory ID: RHSA-2020:1335-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2020:1335
Issue date: 2020-04-06
CVE Names: CVE-2020-10188
=====================================================================

1. Summary:

An update for telnet is now available for Red Hat Enterprise Linux 6.

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 Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

Telnet is a popular protocol for logging in to remote systems over the
Internet. The telnet-server packages include a telnet service that supports
remote logins into the host machine. The telnet service is disabled by
default.

Security Fix(es):

* telnet-server: no bounds checks in nextitem() function allows to remotely
execute arbitrary code (CVE-2020-10188)

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/):

1811673 - CVE-2020-10188 telnet-server: no bounds checks in nextitem() function allows to remotely execute arbitrary code

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
telnet-0.17-49.el6_10.src.rpm

i386:
telnet-0.17-49.el6_10.i686.rpm
telnet-debuginfo-0.17-49.el6_10.i686.rpm
telnet-server-0.17-49.el6_10.i686.rpm

x86_64:
telnet-0.17-49.el6_10.x86_64.rpm
telnet-debuginfo-0.17-49.el6_10.x86_64.rpm
telnet-server-0.17-49.el6_10.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
telnet-0.17-49.el6_10.src.rpm

x86_64:
telnet-0.17-49.el6_10.x86_64.rpm
telnet-debuginfo-0.17-49.el6_10.x86_64.rpm
telnet-server-0.17-49.el6_10.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
telnet-0.17-49.el6_10.src.rpm

i386:
telnet-0.17-49.el6_10.i686.rpm
telnet-debuginfo-0.17-49.el6_10.i686.rpm
telnet-server-0.17-49.el6_10.i686.rpm

ppc64:
telnet-0.17-49.el6_10.ppc64.rpm
telnet-debuginfo-0.17-49.el6_10.ppc64.rpm
telnet-server-0.17-49.el6_10.ppc64.rpm

s390x:
telnet-0.17-49.el6_10.s390x.rpm
telnet-debuginfo-0.17-49.el6_10.s390x.rpm
telnet-server-0.17-49.el6_10.s390x.rpm

x86_64:
telnet-0.17-49.el6_10.x86_64.rpm
telnet-debuginfo-0.17-49.el6_10.x86_64.rpm
telnet-server-0.17-49.el6_10.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
telnet-0.17-49.el6_10.src.rpm

i386:
telnet-0.17-49.el6_10.i686.rpm
telnet-debuginfo-0.17-49.el6_10.i686.rpm
telnet-server-0.17-49.el6_10.i686.rpm

x86_64:
telnet-0.17-49.el6_10.x86_64.rpm
telnet-debuginfo-0.17-49.el6_10.x86_64.rpm
telnet-server-0.17-49.el6_10.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-2020-10188
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 2020 Red Hat, Inc.
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