USN-3795-3: libssh regression

Releases

• Ubuntu 18.10
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• libssh - A tiny C SSH library

Details

USN-3795-1 and USN-3795-2 fixed a vulnerability in libssh. The upstream
fix introduced a regression. This update fixes the problem.

Original advisory details:

Peter Winter-Smith discovered that libssh incorrectly handled
authentication when being used as a server. A remote attacker could use
this issue to bypass authentication without any credentials.

Update instructions

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

Ubuntu 18.10

• libssh-4 - 0.8.1-1ubuntu0.3

Ubuntu 18.04

• libssh-4 - 0.8.0~20170825.94fa1e38-1ubuntu0.2

Ubuntu 16.04

• libssh-4 - 0.6.3-4.3ubuntu0.2

Ubuntu 14.04

• libssh-4 - 0.6.1-0ubuntu3.5

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

• https://launchpad.net/bugs/1805348