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Ubuntu 18.04 LTS USN-3809-2 Critical OpenSSH Regression Issue

ubuntu
Calendar Grey August 12, 2021
Dist Ubuntu Esm H88
Investigate the OpenSSH flaw highlighted in Ubuntu's security patch USN-3809-2 and its corrective measures for previous security weaknesses.
USN-3809-1 introduced a regression in OpenSSH.

Summary

USN-3809-1 introduced a regression in OpenSSH.

Software Description:

- openssh: secure shell (SSH) for secure access to remote machines

Details:

USN-3809-1 fixed vulnerabilities in OpenSSH. The update for CVE-2018-15473

was incomplete and could introduce a regression in certain environments.

This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Robert Swiecki discovered that OpenSSH incorrectly handled certain messages.

An attacker could possibly use this issue to cause a denial of service.

This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.

(CVE-2016-10708)

It was discovered that OpenSSH incorrectly handled certain requests.

An attacker could possibly use this issue to access sensitive information.

(CVE-2018-15473)

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu OpenSSH regression issue

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS:
  openssh-server                  1:7.6p1-4ubuntu0.5

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-3809-2

https://ubuntu.com/security/notices/USN-3809-1

https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1934501

Severity
critical
Lowest
Low
Medium
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Critical

August 12, 2021

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu OpenSSH regression issue

Package Information

https://launchpad.net/ubuntu/+source/openssh/1:7.6p1-4ubuntu0.5

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