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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.2164
                    USN-4400-1: nfs-utils vulnerability
                               23 June 2020

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

Product:           nfs-utils
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Root Compromise -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-3689  

Reference:         ESB-2019.3970
                   ESB-2019.3953
                   ESB-2019.3911

Original Bulletin: 
   https://usn.ubuntu.com/4400-1/

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USN-4400-1: nfs-utils vulnerability
22 June 2020

nfs-utils vulnerability
A security issue affects these releases of Ubuntu and its derivatives:

  o Ubuntu 20.04 LTS
  o Ubuntu 19.10
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS

Summary

nfs-utils could be made to overwrite files as the administrator.

Software Description

  o nfs-utils - None

Details

It was discovered that the nfs-utils package set incorrect permissions on the /
var/lib/nfs directory. An attacker could possibly use this issue to escalate
privileges.

Update instructions

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

Ubuntu 20.04 LTS
    nfs-common - 1:1.3.4-2.5ubuntu3.3
Ubuntu 19.10
    nfs-common - 1:1.3.4-2.5ubuntu2.1
Ubuntu 18.04 LTS
    nfs-common - 1:1.3.4-2.1ubuntu5.3
Ubuntu 16.04 LTS
    nfs-common - 1:1.2.8-9ubuntu12.3

To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .

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

References

  o CVE-2019-3689

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