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[dino99 <1420643@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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


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

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-stop-nagging upgrade-software-version vivid

** Tags added: bot-stop-nagging upgrade-software-version vivid

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https://bugs.launchpad.net/bugs/1420643

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

Status in xorg package in Ubuntu:
  New

Bug description:
  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

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

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