Bug 950438 – CVE-2013-1940 xorg-x11-server: Information disclosure due enabling events from hot-plug devices despite input from the device being momentarily disabled

Bugzilla will be upgraded to version 5.0. The upgrade date is tentatively scheduled for 2 December 2018, pending final testing and feedback.

Bug 950438 - (CVE-2013-1940) CVE-2013-1940 xorg-x11-server: Information disclosure due enabling events from hot-plug devices despite input from the device being momentarily disabled

Summary:	CVE-2013-1940 xorg-x11-server: Information disclosure due enabling events fro...

Status:	CLOSED ERRATA

Aliases:	CVE-2013-1940

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=low,public=20130417,reported=2...
Keywords:	Security

Depends On:	952949 1015161 1016412
Blocks:	950455 974906
	Show dependency tree / graph

Reported:	2013-04-10 04:58 EDT by Jan Lieskovsky
Modified:	2015-10-15 13:52 EDT (History)
CC List:	6 users (show)

See Also:
Fixed In Version:	xorg-server-1.13.4, xorg-server-1.14.1
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2013-11-22 00:37:32 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Upstream patch (1.14 KB, patch) 2013-04-10 05:46 EDT, Huzaifa S. Sidhpurwala	no flags	Details \| Diff
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2013:1620	normal	SHIPPED_LIVE	Low: xorg-x11-server security and bug fix update	2013-11-20 16:54:02 EST

Groups: None (edit)

Description Jan Lieskovsky 2013-04-10 04:58:06 EDT

An information disclosure flaw was found in the way X.org X11 server, an open source X Window System server implementation, used to register new hot-plug devices, when X.org X11 server was instructed (for that particular moment) not to receive input devices events. Formerly when registering new input device, X.org X11 server simultaneously enabled retrieval of input from the particular device (regardless of the setting). A local unsuspecting user, relying on the X.org X11 server disable input feature it to properly prohibit acquiring of events from this newly added hot-plug device, could supply a sensitive information that, due the above bug, would become available to the physically proximate attackers.

Comment 2 Jan Lieskovsky 2013-04-10 05:07:34 EDT

Acknowledgements:

This issue was found by David Airlie and Peter Hutterer of Red Hat.

Comment 3 Jan Lieskovsky 2013-04-10 05:16:58 EDT

This issue did NOT affect the version of the xorg-x11-server package, as shipped with Red Hat Enterprise Linux 5.

--

This issue affects the version of the xorg-x11-server package, as shipped with Red Hat Enterprise Linux 6.

Comment 4 Jan Lieskovsky 2013-04-10 05:17:32 EDT

This issue affects the versions of the xorg-x11-server package, as shipped with Fedora release of 17 and 18.

Comment 5 Huzaifa S. Sidhpurwala 2013-04-10 05:45:13 EDT

Upstream bug:

https://bugs.freedesktop.org/show_bug.cgi?id=63353

Comment 6 Huzaifa S. Sidhpurwala 2013-04-10 05:46:09 EDT

Created attachment 733595 [details]
Upstream patch

Comment 12 Huzaifa S. Sidhpurwala 2013-04-15 06:52:24 EDT

This issue has been classified as low impact because of the following reason(s):

In order to exploit this issue, the attacker needs to

- have an account on the target machine, or otherwise be able to start an app listening for key events.
- have physical access to the machine to hotplug the keyboard or some other device.
- be logged in at the time, but vt-switch away without the screen lock being activated.
- In order to capture passwords etc, the other-use needs to have a short enough password or the other user doesn't do anything else, otherwise the events will overrun the buffer and you only get a fraction of them

Comment 14 Huzaifa S. Sidhpurwala 2013-04-17 00:15:14 EDT

Created xorg-x11-server tracking bugs for this issue

Affects: fedora-all [bug 952949]

Comment 15 Huzaifa S. Sidhpurwala 2013-04-17 01:17:48 EDT

Upstream patch:

http://cgit.freedesktop.org/xorg/xserver/commit/?id=6ca03b9161d33b1d2b55a3a1a913cf88deb2343f

Comment 17 Fedora Update System 2013-04-19 21:17:28 EDT

xorg-x11-server-1.13.3-3.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 18 Fedora Update System 2013-04-30 00:35:49 EDT

xorg-x11-server-1.14.0-6.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 19 Jan Lieskovsky 2013-05-10 04:11:51 EDT

Related blog posts:

  http://who-t.blogspot.cz/2013/04/cve-2013-1940-vt-switched-servers.html
  https://plus.google.com/104877287288155269055/posts/YqUmH95LTkh

Comment 20 Fedora Update System 2013-06-07 19:29:47 EDT

xorg-x11-server-1.12.4-7.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 23 errata-xmlrpc 2013-11-21 06:29:18 EST

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2013:1620 https://rhn.redhat.com/errata/RHSA-2013-1620.html

Comment 24 Huzaifa S. Sidhpurwala 2013-11-22 00:37:32 EST

Statement:

(none)

Note You need to log in before you can comment on or make changes to this bug.