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USN-6561-1: libssh vulnerability

19 December 2023

A security issue was fixed in libssh.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Releases

Packages

  • libssh - A tiny C SSH library

Details

Fabian Bäumer, Marcus Brinkmann, Jörg Schwenk discovered that the SSH
protocol was vulnerable to a prefix truncation attack. If a remote attacker
was able to intercept SSH communications, extension negotiation messages
could be truncated, possibly leading to certain algorithms and features
being downgraded. This issue is known as the Terrapin attack. This update
adds protocol extensions to mitigate this issue.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 23.10
Ubuntu 23.04
Ubuntu 22.04
Ubuntu 20.04

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

References

Related notices

  • USN-6560-1: openssh-client, openssh, openssh-sftp-server, ssh-askpass-gnome, openssh-tests, ssh, openssh-server
  • USN-6560-2: ssh-krb5, openssh-client, openssh, openssh-sftp-server, ssh-askpass-gnome, ssh, openssh-server, openssh-client-ssh1
  • USN-6585-1: libssh2-1, libssh2-1-dev, libssh2
  • USN-6589-1: filezilla, filezilla-common
  • USN-6598-1: paramiko-doc, paramiko, python3-paramiko
  • USN-6738-1: lxd, lxc2, lxd-client, golang-github-lxc-lxd-dev, lxd-tools