A libssh security update has been released for Ubuntu Linux 20.04 LTS and 21.04.
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Ubuntu Security Notice USN-5053-1
August 26, 2021
libssh vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 21.04
- Ubuntu 20.04 LTS
Summary:
libssh could be made to crash or run programs if it received specially
crafted network traffic.
Software Description:
- 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.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 21.04:
libssh-4 0.9.5-1ubuntu0.1
Ubuntu 20.04 LTS:
libssh-4 0.9.3-2ubuntu2.2
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-5053-1
CVE-2021-3634
Package Information:
https://launchpad.net/ubuntu/+source/libssh/0.9.5-1ubuntu0.1
https://launchpad.net/ubuntu/+source/libssh/0.9.3-2ubuntu2.2
