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Ubuntu 21.04 & 20.04 LTS USN-5053-1 Severe Denial of Service

ubuntu
Calendar Grey August 26, 2021
Dist Ubuntu Esm H88
A vulnerability in libssh can lead to system crashes or arbitrary code execution from manipulated input. Update your Ubuntu 20.04 LTS and 21.04 installations promptly to fix this
libssh could be made to crash or run programs if it received specially crafted network traffic.

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.

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu remote execution libssh

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

Severity
critical
Lowest
Low
Medium
High
Critical

August 26, 2021

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu remote execution libssh

Package Information

https://launchpad.net/ubuntu/+source/libssh/0.9.5-1ubuntu0.1
https://launchpad.net/ubuntu/+source/libssh/0.9.3-2ubuntu2.2

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