X.Org Server 1.17.1 Released To Fix CVE-2015-0255

[dino99]

The vulnerability addressed by xorg-server 1.17.1 is CVE-2015-0255, which was made public today. The newest X.Org CVE is described as:
Olivier Fourdan from Red Hat has discovered a protocol handling issue in the way the X server code base handles the XkbSetGeometry request.

The issue stems from the server trusting the client to send valid string lengths in the request data. A malicious client with string lengths exceeding the request length can cause the server to copy adjacent memory data into the XKB structs. This data is then available to the client via the XkbGetGeometry request. The data length is at least up to 64k, it is possible to obtain more data by chaining strings, each string length is then determined by whatever happens to be in that 16-bit region of memory.

A similarly crafted request can likely cause the X server to crash.

This issue has been assigned CVE-2015-0255

http://lists.freedesktop.org/archives/xorg/2015-February/057158.html with avaliable patch

Hope vivid will soon get that upgrade, as it still has 1.16.2.901

[dino99 (9d9)]

The canonical-x staging ppa have built it, and the installation/upgrade goes well but the qxl driver package is removed (abi issue ?)

[dino99 (9d9)]

cve fixed

xorg-server (2:1.16.2.901-1ubuntu4) vivid; urgency=medium

  * SECURITY UPDATE: information leak and denial of service in
    XkbSetGeometry
    - debian/patches/CVE-2015-0255.patch: properly check lengths in
      xkb/xkb.c.
    - CVE-2015-0255
  * debian/patches/dix-allow-zero-height-putimage-requests.patch: fix
    regression in CVE-2014-8092 security update by allowing zero-height
    PutImage requests in dix/dispatch.c.
 -- Marc Deslauriers <email address hidden> Tue, 17 Feb 2015 07:56:08 -0500