Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2019.1959.2
USN-4001: libseccomp vulnerability
3 June 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: libseccomp
Publisher: Ubuntu
Operating System: Ubuntu
Linux variants
Impact/Access: Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-9893
Original Bulletin:
https://usn.ubuntu.com/4001-1/
https://usn.ubuntu.com/4001-2/
Comment: This bulletin contains two (2) Ubuntu security advisories.
This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running libseccomp check for an updated version of the software for
their operating system.
Revision History: June 3 2019: Added USN-4001-2
May 31 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
USN-4001-1: libseccomp vulnerability
30 May 2019
libseccomp vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 19.04
o Ubuntu 18.10
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Summary
libseccomp could allow unintended access to system calls.
Software Description
o libseccomp - library for working with the Linux seccomp filter
Details
Jann Horn discovered that libseccomp did not correctly generate 64-bit syscall
argument comparisons with arithmetic operators (LT, GT, LE, GE). An attacker
could use this to bypass intended access restrictions for argument-filtered
system calls.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 19.04
libseccomp2 - 2.4.1-0ubuntu0.19.04.3
Ubuntu 18.10
libseccomp2 - 2.4.1-0ubuntu0.18.10.3
Ubuntu 18.04 LTS
libseccomp2 - 2.4.1-0ubuntu0.18.04.2
Ubuntu 16.04 LTS
libseccomp2 - 2.4.1-0ubuntu0.16.04.2
To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades .
This update uses a new upstream release which includes additional bug fixes. In
general, a standard system update will make all the necessary changes.
References
o CVE-2019-9893
- -------------------------------------------------------------------------------
USN-4001-2: libseccomp vulnerability
30 May 2019
libseccomp vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 14.04 ESM
Summary
libseccomp could allow unintended access to system calls.
Software Description
o libseccomp - library for working with the Linux seccomp filter
Details
USN-4001-1 fixed a vulnerability in libseccomp. This update provides the
corresponding update for Ubuntu 14.04 ESM.
Original advisory details:
Jann Horn discovered that libseccomp did not correctly generate 64-bit syscall
argument comparisons with arithmetic operators (LT, GT, LE, GE). An attacker
could use this to bypass intended access restrictions for argument-filtered
system calls.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 14.04 ESM
libseccomp2 - 2.4.1-0ubuntu0.14.04.2
To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .
This update uses a new upstream release which includes additional bug fixes. In
general, a standard system update will make all the necessary changes.
References
o USN-4001-1
o CVE-2019-9893
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=f1x6
-----END PGP SIGNATURE-----