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Ubuntu 20.04 & 20.10: USN-5762-1 Serious OpenSSH Service Disruption

ubuntu
Calendar Grey March 10, 2021
Dist Ubuntu Esm H88
OpenSSH on Ubuntu can potentially fail when exposed to maliciously constructed packets, posing threats of service interruption or remote compromise. Ensure you update immediately!
OpenSSH could be made to crash or run programs if it received specially crafted network traffic.

Summary

OpenSSH could be made to crash or run programs if it received specially

crafted network traffic.

Software Description:

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

Details:

It was discovered that the OpenSSH ssh-agent incorrectly handled memory. A

remote attacker able to connect to the agent could use this issue to cause

it to crash, resulting in a denial of service, or possibly execute

arbitrary code.

Topics%20covered

Topics Covered

security advisory remote access openssh ubuntu deny of service

Update Instructions

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

Ubuntu 20.10:
  openssh-client                  1:8.3p1-1ubuntu0.1

Ubuntu 20.04 LTS:
  openssh-client                  1:8.2p1-4ubuntu0.2

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

References

https://ubuntu.com/security/notices/USN-4762-1

CVE-2021-28041

Severity
critical
Lowest
Low
Medium
High
Critical

March 10, 2021

Topics%20covered

Topics Covered

security advisory remote access openssh ubuntu deny of service

Package Information

https://launchpad.net/ubuntu/+source/openssh/1:8.3p1-1ubuntu0.1
https://launchpad.net/ubuntu/+source/openssh/1:8.2p1-4ubuntu0.2

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