ESB-2020.2669 – [Ubuntu] libssh: Denial of service – Remote/unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.2669
                     USN-4447-1: libssh vulnerability
                               5 August 2020

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           libssh
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-16135  

Reference:         ESB-2020.2629

Original Bulletin: 
   https://usn.ubuntu.com/4447-1/

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USN-4447-1: libssh vulnerability
04 August 2020

libssh could be made to crash if it received a specially crafted request.
Releases

  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS

Packages

  o libssh - None

Details

It was discovered that libssh incorrectly handled certain requests.
An attacker could possibly use this issue to cause a denial of service.

Update instructions

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

Ubuntu 20.04

  o libssh-4 - 0.9.3-2ubuntu2.1

Ubuntu 18.04

  o libssh-4 - 0.8.0~20170825.94fa1e38-1ubuntu0.7

Ubuntu 16.04

  o libssh-4 - 0.6.3-4.3ubuntu0.6

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

References

  o CVE-2020-16135

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