Alerts This Week
Warning Icon 1 640
Alerts This Week
Warning Icon 1 640

Ubuntu 23.10 USN-6565-1 critical: OpenSSH access threats

ubuntu
Calendar Grey January 3, 2024
Dist Ubuntu Esm H88
Fedora stable releases have patched various OpenSSH security flaws, enhancing protected access from afar. Upgrade promptly for protection.
Several security issues were fixed in OpenSSH.

Summary

Several security issues were fixed in OpenSSH.

Software Description:

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

Details:

It was discovered that OpenSSH incorrectly handled supplemental groups when

running helper programs for AuthorizedKeysCommand and

AuthorizedPrincipalsCommand as a different user. An attacker could possibly

use this issue to escalate privileges. This issue only affected Ubuntu

20.04 LTS. (CVE-2021-41617)

It was discovered that OpenSSH incorrectly added destination constraints

when PKCS#11 token keys were added to ssh-agent, contrary to expectations.

This issue only affected Ubuntu 22.04 LTS, and Ubuntu 23.04.

(CVE-2023-51384)

It was discovered that OpenSSH incorrectly handled user names or host names

with shell metacharacters. An attacker could possibly use this issue to

perform OS command injection. (CVE-2023-51385)

Topics%20covered

Topics Covered

security advisory critical issue remote access openssh ubuntu access threat

Update Instructions

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

Ubuntu 23.10:
   openssh-client                  1:9.3p1-1ubuntu3.2
   openssh-server                  1:9.3p1-1ubuntu3.2

Ubuntu 23.04:
   openssh-client                  1:9.0p1-1ubuntu8.7
   openssh-server                  1:9.0p1-1ubuntu8.7

Ubuntu 22.04 LTS:
   openssh-client                  1:8.9p1-3ubuntu0.6
   openssh-server                  1:8.9p1-3ubuntu0.6

Ubuntu 20.04 LTS:
   openssh-client                  1:8.2p1-4ubuntu0.11
   openssh-server                  1:8.2p1-4ubuntu0.11

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

References

https://ubuntu.com/security/notices/USN-6565-1

CVE-2021-41617, CVE-2023-51384, CVE-2023-51385

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6565-1

Topics%20covered

Topics Covered

security advisory critical issue remote access openssh ubuntu access threat

Package Information

https://launchpad.net/ubuntu/+source/openssh/1:9.3p1-1ubuntu3.2
https://launchpad.net/ubuntu/+source/openssh/1:8.2p1-4ubuntu0.11

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Your message here