1. Ubuntu Security Notices
  2. USN-5053-1

USN-5053-1: libssh vulnerability

Publication date

26 August 2021

Overview

libssh could be made to crash or run programs if it received specially crafted network traffic.

Releases

Packages

  • libssh - A tiny C SSH library

Details

It was discovered that libssh incorrectly handled rekeying. A remote
attacker could use this issue to cause libssh to crash, resulting in a
denial of service, or possibly execute arbitrary code.

It was discovered that libssh incorrectly handled rekeying. A remote
attacker could use this issue to cause libssh to crash, resulting in a
denial of service, or possibly execute arbitrary code.

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
21.04 hirsute libssh-4 –  0.9.5-1ubuntu0.1
20.04 focal libssh-4 –  0.9.3-2ubuntu2.2

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.

Get Ubuntu Pro

References

Have additional questions?

Talk to a member of the team ›