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Red Hat: RHSA-2022-0158-02 Important: Telnet Remote Code Execution

red hat
Calendar Grey January 18, 2022
Dist Redhat Esm H88
A security patch has been issued for Red Hat Enterprise Linux addressing critical vulnerabilities in telnet that could allow unauthorized remote execution.
An update for telnet is now available for Red Hat Enterprise Linux 7.7 Advanced Update Support, Red Hat Enterprise Linux 7.7 Telco Extended Update Support, and Red Hat Enterprise L...

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

Summary

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.

Topics%20covered

Topics Covered

security advisory software update remote code execution Red Hat Enterprise Linux important telnet user access

References

https://access.redhat.com/security/cve/CVE-2020-10188 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux Server AUS (v. 7.7):
Source: telnet-0.17-65.el7_7.src.rpm
x86_64: telnet-0.17-65.el7_7.x86_64.rpm telnet-debuginfo-0.17-65.el7_7.x86_64.rpm telnet-server-0.17-65.el7_7.x86_64.rpm
Red Hat Enterprise Linux Server E4S (v. 7.7):
Source: telnet-0.17-65.el7_7.src.rpm
ppc64le: telnet-0.17-65.el7_7.ppc64le.rpm telnet-debuginfo-0.17-65.el7_7.ppc64le.rpm telnet-server-0.17-65.el7_7.ppc64le.rpm
x86_64: telnet-0.17-65.el7_7.x86_64.rpm telnet-debuginfo-0.17-65.el7_7.x86_64.rpm telnet-server-0.17-65.el7_7.x86_64.rpm
Red Hat Enterprise Linux Server TUS (v. 7.7):
Source: telnet-0.17-65.el7_7.src.rpm
x86_64: telnet-0.17-65.el7_7.x86_64.rpm telnet-debuginfo-0.17-65.el7_7.x86_64.rpm telnet-server-0.17-65.el7_7.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/


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2022:0158-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2022:0158
Issue date: 2022-01-18

Topic

An update for telnet is now available for Red Hat Enterprise Linux 7.7Advanced Update Support, Red Hat Enterprise Linux 7.7 Telco Extended UpdateSupport, and Red Hat Enterprise Linux 7.7 Update Services for SAPSolutions.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory software update remote code execution Red Hat Enterprise Linux important telnet user access

Relevant Releases Architectures

Red Hat Enterprise Linux Server AUS (v. 7.7) - x86_64

Red Hat Enterprise Linux Server E4S (v. 7.7) - ppc64le, x86_64

Red Hat Enterprise Linux Server TUS (v. 7.7) - x86_64

Bugs Fixed

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

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