oss-security - X.Org server security advisory: December 1, 2020

Follow @Openwall on Twitter for new release announcements and other news

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20201201151602.GC10502@herrb.net>
Date: Tue, 1 Dec 2020 16:16:02 +0100
From: Matthieu Herrb <matthieu@...rb.eu>
To: oss-security@...ts.openwall.com
Subject: X.Org server security advisory: December 1, 2020

Multiple input validation failures in X server XKB extension
============================================================

These issues can lead to privileges elevations for authorized clients
on systems where the X server is running privileged.

* CVE-2020-14360 / ZDI CAN 11572 XkbSetMap Out-Of-Bounds Access

Insufficient checks on the lengths of the XkbSetMap request can lead to
out of bounds memory accesses in the X server.

* CVE-2020-25712 / ZDI-CAN-11839 XkbSetDeviceInfo Heap-based Buffer Overflow

Insufficient checks on input of the XkbSetDeviceInfo request can lead
to a buffer overflow on the head in the X server.

Patches
-------

Patches for these issues have been committed to the xorg server git
repository. xorg-server 1.20.10 will be released shortly and will
include these patches.

https://gitlab.freedesktop.org/xorg/xserver.git

commit 446ff2d3177087b8173fa779fa5b77a2a128988b

    Check SetMap request length carefully.

    Avoid out of bounds memory accesses on too short request.

    ZDI-CAN 11572 /  CVE-2020-14360

commit 87c64fc5b0db9f62f4e361444f4b60501ebf67b9

    Fix XkbSetDeviceInfo() and SetDeviceIndicators() heap overflows

    ZDI-CAN 11389 / CVE-2020-25712

Thanks
======

These vulnerabilities have been discovered by Jan-Niklas Sohn working
with Trend Micro Zero Day Initiative.

-- 
Matthieu Herrb

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.