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Ubuntu 18.04 LTS USN-6242-2 Critical OpenSSH Remote Threat

ubuntu
Calendar Grey July 31, 2023
Dist Ubuntu Esm H88
A security vulnerability in OpenSSH enables command execution as logged-in users via ssh-agent forwarding. Enhance Ubuntu security with key measures like disabling agent forwarding
OpenSSH could be made to run programs as your login when using ssh-agent forwarding.

Summary

OpenSSH could be made to run programs as your login when using ssh-agent

forwarding.

Software Description:

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

Details:

USN-6242-1 fixed a vulnerability in OpenSSH. This update provides

the corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS,

and Ubuntu 18.04 LTS.

Original advisory details:

It was discovered that OpenSSH incorrectly handled loading certain PKCS#11

providers. If a user forwarded their ssh-agent to an untrusted system, a

remote attacker could possibly use this issue to load arbitrary libraries

from the user's system and execute arbitrary code.

Topics%20covered

Topics Covered

security advisory Ubuntu vulnerability critical threat remote code OpenSSH ssh-agent

Update Instructions

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
  openssh-client                  1:7.6p1-4ubuntu0.7+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
  openssh-client                  1:7.2p2-4ubuntu2.10+esm3

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
  openssh-client                  1:6.6p1-2ubuntu2.13+esm1

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

References

https://ubuntu.com/security/notices/USN-6242-2

https://ubuntu.com/security/notices/USN-6242-1

CVE-2023-38408

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6242-2

Topics%20covered

Topics Covered

security advisory Ubuntu vulnerability critical threat remote code OpenSSH ssh-agent

Package Information

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