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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2583 X.Org X server vulnerabilities 13 October 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: xserver-xorg-core Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2017-13723 CVE-2017-13721 Reference: ESB-2017.2535 Original Bulletin: http://www.ubuntu.com/usn/usn-3453-1 - --------------------------BEGIN INCLUDED TEXT-------------------- ========================================================================== Ubuntu Security Notice USN-3453-1 October 12, 2017 xorg-server, xorg-server-hwe-16.04, xorg-server-lts-xenial vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - - Ubuntu 17.04 - - Ubuntu 16.04 LTS - - Ubuntu 14.04 LTS Summary: Several security issues were fixed in the X.Org X server. Software Description: - - xorg-server: X.Org X11 server - - xorg-server-hwe-16.04: X.Org X11 server - - xorg-server-lts-xenial: X.Org X11 server Details: Michal Srb discovered that the X.Org X server incorrectly handled shared memory segments. An attacker able to connect to an X server, either locally or remotely, could use this issue to crash the server, or possibly replace shared memory segments of other X clients in the same session. (CVE-2017-13721) Michal Srb discovered that the X.Org X server incorrectly handled XKB buffers. An attacker able to connect to an X server, either locally or remotely, could use this issue to crash the server, or possibly execute arbitrary code. (CVE-2017-13723) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 17.04: xserver-xorg-core 2:1.19.3-1ubuntu1.2 Ubuntu 16.04 LTS: xserver-xorg-core 2:1.18.4-0ubuntu0.6 xserver-xorg-core-hwe-16.04 2:1.19.3-1ubuntu1~16.04.3 Ubuntu 14.04 LTS: xserver-xorg-core 2:1.15.1-0ubuntu2.10 xserver-xorg-core-lts-xenial 2:1.18.3-1ubuntu2.3~trusty3 After a standard system update you need to reboot your computer to make all the necessary changes. References: https://www.ubuntu.com/usn/usn-3453-1 CVE-2017-13721, CVE-2017-13723 Package Information: https://launchpad.net/ubuntu/+source/xorg-server/2:1.19.3-1ubuntu1.2 https://launchpad.net/ubuntu/+source/xorg-server/2:1.18.4-0ubuntu0.6 https://launchpad.net/ubuntu/+source/xorg-server-hwe-16.04/2:1.19.3-1ubuntu1~16.04.3 https://launchpad.net/ubuntu/+source/xorg-server/2:1.15.1-0ubuntu2.10 https://launchpad.net/ubuntu/+source/xorg-server-lts-xenial/2:1.18.3-1ubuntu2.3~trusty3 - --------------------------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. 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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 iQIVAwUBWeAIKYx+lLeg9Ub1AQgWKA/+IGNxsS9mwnQ31GhIcfE6mHbBKPvEXSAl IOW0HZ3c5eWFtXidg4vOsZTvauv09o+BvYlvMMIBvmu7XuXnklG8/rAhdLK3Rlhr ZZx7JvbR8W2jeoFktdLzkMeUPob8JPAF93oDwBqOdhyEx/VYcGMSKKQnfQk/YoDR W7uHDzxEW6t0xeHYjez2T1xm5qfdpShtpEMZQbTB6VcDYMudEvcXczQjdGMmQTlm P+wqIipKalwgPGM7E7FH1jdd1zEE3t3YrD6rTwFGcMobZXWOsbkQhq/f1end7Wpd gYRCBmGhmDUa+75PntA4LnuO0CCfnsKQh6uDVScdRjiBl31lXEMfpUzGnfA9IYsO /BpxQauJXogP8c+eqSTQ1lqqzfiZWWxOc8r9Lb03UvzJsA35DYndnYdnvroWj//J tfkR2LqeYw0fRmxkZmbG++zRrfD9NmI4/184zByfQa/0WwcRz619zlYLHUKTR8mS 4l1gT0YtT6Ven3JmVHpLw2/OgNpdWL/YYOcvCHcbfcGPJqt/oOlG0QbnIg0k+CCt OBuY7drvidr1pLoIsUQqe6vDWCqCRfcL1SrBDBoUvo9yn/4z0HqQ8n2cHVc98rf4 VO+v33pF6R55bLCzGOvrahRTTGpWOOznVKyIHioT2wlSgzkp/jjcRpCFgkLE5Q7R nOnEhjAZ9GE= =tNLa -----END PGP SIGNATURE-----