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