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             AUSCERT External Security Bulletin Redistribution

                              ESB-2019.1576.2
                      USN-3968: Sudo vulnerabilities
                                30 May 2019

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

Product:           sudo
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Root Compromise -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-1000368 CVE-2016-7076 

Reference:         ESB-2017.1676
                   ESB-2017.1577
                   ESB-2017.1546.2
                   ESB-2016.2862

Original Bulletin: 
   https://usn.ubuntu.com/3968-1/
   https://usn.ubuntu.com/3968-2/

Comment: This bulletin contains two (2) Ubuntu security advisories.

Revision History:  May 30 2019: Added USN-3968-2
                   May  7 2019: Initial Release

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USN-3968-1: Sudo vulnerabilities
6 May 2019

sudo vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:

  o Ubuntu 16.04 LTS

Summary

Several security issues were fixed in Sudo.

Software Description

  o sudo - Provide limited super user privileges to specific users

Details

Florian Weimer discovered that Sudo incorrectly handled the noexec restriction
when used with certain applications. A local attacker could possibly use this
issue to bypass configured restrictions and execute arbitrary commands.
(CVE-2016-7076)

It was discovered that Sudo did not properly parse the contents of /proc/[pid]/
stat when attempting to determine its controlling tty. A local attacker in some
configurations could possibly use this to overwrite any file on the filesystem,
bypassing intended permissions. (CVE-2017-1000368)

Update instructions

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

Ubuntu 16.04 LTS
    sudo - 1.8.16-0ubuntu1.6
    sudo-ldap - 1.8.16-0ubuntu1.6

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-2016-7076
  o CVE-2017-1000368

- -------------------------------------------------------------------------------

USN-3968-2: Sudo vulnerability
29 May 2019

sudo vulnerability
A security issue affects these releases of Ubuntu and its derivatives:

  o Ubuntu 14.04 ESM

Summary

Sudo could be made to overwrite files if it received a specially crafted input.

Software Description

  o sudo - Provide limited super user privileges to specific users

Details

USN-3968-1 fixed a vulnerability in Sudo. This update provides the
corresponding update for Ubuntu 14.04 ESM.

Original advisory details:

It was discovered that Sudo did not properly parse the contents of /proc/[pid]/
stat when attempting to determine its controlling tty. A local attacker in some
configurations could possibly use this to overwrite any file on the filesystem,
bypassing intended permissions. (CVE-2017-1000368)

Update instructions

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

Ubuntu 14.04 ESM
    sudo - 1.8.9p5-1ubuntu1.5+esm1
    sudo-ldap - 1.8.9p5-1ubuntu1.5+esm1

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 USN-3968-1
  o CVE-2017-1000368

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