ESB-2017.3034 - [Linux][Ubuntu] libxfont1: Modify arbitrary files - Existing account 2017-11-30

Printable version
PGP/GPG verifiable version

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

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

                               ESB-2017.3034
                          libXfont vulnerability
                             30 November 2017

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

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

Product:           libxfont1
Publisher:         Ubuntu
Operating System:  Ubuntu
                   Linux variants
Impact/Access:     Modify Arbitrary Files -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-16611  

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3500-1

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Ubuntu. It is recommended that administrators 
         running libxfont1 check for an updated version of the software for 
         their operating system.

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

Ubuntu Security Notice USN-3500-1
November 29, 2017

libxfont, libxfont1, libxfont2 vulnerability


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

- - Ubuntu 17.10
- - Ubuntu 17.04
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS

Summary:

libXfont could be made to access arbitrary files, including special device
files.

Software Description:
- - libxfont: X11 font rasterisation library
- - libxfont1: X11 font rasterisation library
- - libxfont2: X11 font rasterisation library

Details:

It was discovered that libXfont incorrectly followed symlinks when opening
font files. A local unprivileged user could use this issue to cause the X
server to access arbitrary files, including special device files.

Update instructions:

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

Ubuntu 17.10:
  libxfont1                       1:1.5.2-4ubuntu1.1
  libxfont2                       1:2.0.1-3ubuntu1.1

Ubuntu 17.04:
  libxfont1                       1:1.5.2-4ubuntu0.2
  libxfont2                       1:2.0.1-3ubuntu0.2

Ubuntu 16.04 LTS:
  libxfont1                       1:1.5.1-1ubuntu0.16.04.4
  libxfont2                       1:2.0.1-3~ubuntu16.04.3

Ubuntu 14.04 LTS:
  libxfont1                       1:1.4.7-1ubuntu0.4

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

References:
  https://www.ubuntu.com/usn/usn-3500-1
  CVE-2017-16611

Package Information:
  https://launchpad.net/ubuntu/+source/libxfont/1:2.0.1-3ubuntu1.1
  https://launchpad.net/ubuntu/+source/libxfont1/1:1.5.2-4ubuntu1.1
  https://launchpad.net/ubuntu/+source/libxfont/1:2.0.1-3ubuntu0.2
  https://launchpad.net/ubuntu/+source/libxfont1/1:1.5.2-4ubuntu0.2
  https://launchpad.net/ubuntu/+source/libxfont/1:1.5.1-1ubuntu0.16.04.4
  https://launchpad.net/ubuntu/+source/libxfont2/1:2.0.1-3~ubuntu16.04.3
  https://launchpad.net/ubuntu/+source/libxfont/1:1.4.7-1ubuntu0.4

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

iQIVAwUBWh9PZIx+lLeg9Ub1AQhCCRAAn8Z0gYbwnU+29KaX34AE0WeVSuEXixUp
I5OX5CnAPDbK9qZNXJjZARu9Ziigc6Sw6Ym0GqowQST3q8RzDyA0ppbrn3BZ0dRn
+RdcoBJXO+QtLwf8Tho3UCDgOe7vFQNQYb6Qwjg+4jxjGwMM/WOHJUXW8QXBX+sN
ZXWWc4KsDC8rHnWMajTDYgYp9JbSwAGlYAjgVB0i60LvoHAt++xAzPLYl0enE32a
7MVJRVt7iFYZmhpcFV0WUP/2981z38kLxdzBZtJZqZ6J+ePZ6f81PH0T9BwhMC47
LIf2nsBv1dJF0QMTBdKvaVwPTbTwT0FimJbshbNLjjavBBO7n3qfbxxUQlnSZcZi
g1wg1+/gLwgBhYTGxE4GPCe3Zw/QYYLaxmzTgSsvcemf9CEqFxvPkZs4UzP5rRr9
wvXQSCcgld7czpclihiYeYei7MZ/3H2zffCmDJQT3tDR8L/7j1XrcsC2CxFrXTJ6
M9HE5+3HEItGKVD5uYuBkE7ktmWBFxQVhfKu1P9G3+ee9gqdQFi9C47FSobfNFQW
0c4R8QxAkYJacC0MYQEFwGym1IPJ/i+M0y+MfxRdsubcw7TciJlT7PjTYQaUgqg/
q+gy2bgFwm5SeuOWkJptVoPMT1tfCntZ8AtRrgsLHcir/KqzdSS8qXeLrIzm1kur
AuaugT4jDbc=
=64SU
-----END PGP SIGNATURE-----

« Back to bulletins