ESB-2018.3543.3 - UPDATE [Ubuntu] systemd: Multiple vulnerabilities 2018-11-28

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                              ESB-2018.3543.3
                          systemd vulnerabilities
                             28 November 2018

===========================================================================

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

Product:           systemd
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Root Compromise   -- Existing Account
                   Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-15687 CVE-2018-15686 CVE-2018-6954

Reference:         ESB-2018.3507

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3816-1
   http://www.ubuntu.com/usn/usn-3816-2
   http://www.ubuntu.com/usn/usn-3816-3

Revision History:  November 28 2018: Added USN-3816-3
                   November 20 2018: Added USN-3816-2
                   November 13 2018: Initial Release

- --------------------------BEGIN INCLUDED TEXT--------------------

==========================================================================
Ubuntu Security Notice USN-3816-1
November 12, 2018

systemd vulnerabilities
==========================================================================

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

- - Ubuntu 18.10
- - Ubuntu 18.04 LTS
- - Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in systemd.

Software Description:
- - systemd: system and service manager

Details:

Jann Horn discovered that unit_deserialize incorrectly handled status messages
above a certain length. A local attacker could potentially exploit this via
NotifyAccess to inject arbitrary state across re-execution and obtain root
privileges. (CVE-2018-15686)

Jann Horn discovered a race condition in chown_one(). A local attacker
could potentially exploit this by setting arbitrary permissions on certain
files to obtain root privileges. This issue only affected Ubuntu 18.04 LTS
and Ubuntu 18.10. (CVE-2018-15687)

It was discovered that systemd-tmpfiles mishandled symlinks in
non-terminal path components. A local attacker could potentially exploit
this by gaining ownership of certain files to obtain root privileges. This
issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-6954)

Update instructions:

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

Ubuntu 18.10:
  systemd                         239-7ubuntu10.3

Ubuntu 18.04 LTS:
  systemd                         237-3ubuntu10.6

Ubuntu 16.04 LTS:
  systemd                         229-4ubuntu21.8

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://usn.ubuntu.com/usn/usn-3816-1
  CVE-2018-15686, CVE-2018-15687, CVE-2018-6954

Package Information:
  https://launchpad.net/ubuntu/+source/systemd/239-7ubuntu10.3
  https://launchpad.net/ubuntu/+source/systemd/237-3ubuntu10.6
  https://launchpad.net/ubuntu/+source/systemd/229-4ubuntu21.8


==========================================================================
Ubuntu Security Notice USN-3816-2
19 November 2018

systemd vulnerability
==========================================================================

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

  o Ubuntu 18.10
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS

Summary

systemd-tmpfiles could be made to change ownership of arbitrary files.

Software Description

  o systemd - system and service manager

Details

USN-3816-1 fixed several vulnerabilities in systemd. However, the fix for
CVE-2018-6954 was not sufficient. This update provides the remaining fixes.

We apologize for the inconvenience.

Original advisory details:

Jann Horn discovered that unit_deserialize incorrectly handled status messages
above a certain length. A local attacker could potentially exploit this via
NotifyAccess to inject arbitrary state across re-execution and obtain root
privileges. (CVE-2018-15686)

Jann Horn discovered a race condition in chown_one(). A local attacker could
potentially exploit this by setting arbitrary permissions on certain files to
obtain root privileges. This issue only affected Ubuntu 18.04 LTS and Ubuntu
18.10. (CVE-2018-15687)

It was discovered that systemd-tmpfiles mishandled symlinks in non-terminal
path components. A local attacker could potentially exploit this by gaining
ownership of certain files to obtain root privileges. This issue only affected
Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-6954)

Update instructions

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

Ubuntu 18.10
    systemd - 239-7ubuntu10.4
Ubuntu 18.04 LTS
    systemd - 237-3ubuntu10.9
Ubuntu 16.04 LTS
    systemd - 229-4ubuntu21.9

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

After a standard system update you need to reboot your computer to make all the
necessary changes.

References

  o USN-3816-1
  o CVE-2018-6954

(C) 2017 Canonical Ltd. Ubuntu and Canonical are registered trademarks of
Canonical Ltd.

==========================================================================
Ubuntu Security Notice USN-3816-3
27 November 2018

systemd regression
==========================================================================

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

  o Ubuntu 16.04 LTS

Summary

USN-3816-1 caused a regression in systemd-tmpfiles.

Software Description

  o systemd - system and service manager

Details

USN-3816-1 fixed vulnerabilities in systemd. The fix for CVE-2018-6954 caused a
regression in systemd-tmpfiles when running Ubuntu inside a container on some
older kernels. This issue only affected Ubuntu 16.04 LTS. In order to continue
to support this configuration, the fixes for CVE-2018-6954 have been reverted.

We apologize for the inconvenience.

Original advisory details:

Jann Horn discovered that unit_deserialize incorrectly handled status messages
above a certain length. A local attacker could potentially exploit this via
NotifyAccess to inject arbitrary state across re-execution and obtain root
privileges. (CVE-2018-15686)

Jann Horn discovered a race condition in chown_one(). A local attacker could
potentially exploit this by setting arbitrary permissions on certain files to
obtain root privileges. This issue only affected Ubuntu 18.04 LTS and Ubuntu
18.10. (CVE-2018-15687)

It was discovered that systemd-tmpfiles mishandled symlinks in non-terminal
path components. A local attacker could potentially exploit this by gaining
ownership of certain files to obtain root privileges. This issue only affected
Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-6954)

Update instructions

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

Ubuntu 16.04 LTS
    systemd - 229-4ubuntu21.10

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

After a standard system update you need to reboot your computer to make all the
necessary changes.

References

  o USN-3816-1
  o LP: 1804847

(C) 2017 Canonical Ltd. Ubuntu and Canonical are registered trademarks of
Canonical Ltd.

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