Bug 455209 - DoS in the Xrender Extension's Trapezoid Drawing Routines
Summary: DoS in the Xrender Extension's Trapezoid Drawing Routines
Alias: None
Product: Fedora
Classification: Fedora
Component: xorg-x11-server
Version: 8
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Adam Jackson
QA Contact: Fedora Extras Quality Assurance
URL: http://www.rapid7.com/advisories/R7-0...
: 443234 (view as bug list)
Depends On:
TreeView+ depends on / blocked
Reported: 2008-07-14 02:56 UTC by Juliano F. Ravasi
Modified: 2018-04-11 11:28 UTC (History)
4 users (show)

Fixed In Version: xorg-x11-server-
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2008-07-28 21:57:33 UTC
Type: ---

Attachments (Terms of Use)

Description Juliano F. Ravasi 2008-07-14 02:56:15 UTC
XRender trapezoid drawing routines are broken in xorg-server 1.3.0, and causes
X.org crashes. They can be used as a vector for Denial-of-Service attacks, as
described in the following advisories:


The advisories say that xorg-server 1.3.1, that would presumably have been
relased Apr 30, 2007, fixed this. No such release was made to date, and current
git server-1.3-branch tree doesn't include the fix.

This is likely the cause of the following bugs:

Bug 443234 - X Server Crash with Firefox 3 Beta 5
Bug 448586 - Firefox 3 crashes Xorg at picture.c:1600
Bug 453607 - specific webpage in firefox crashes X

All these bugs have backtraces pointing to the trapezoid rendering functions
mentioned in the advisory.

The actual fix for this problem seems to be commit
047bf3349bb697c73c95729a8bbf15f72605901f of the xorg/server git tree, which is
not yet ported to server-1.3-branch.

Possible solutions include:
1. Request upstream to port the fix to server-1.3-branch, then release an
updated package; or
2. backport the needed patches to fix this problem in current Fedora 8, RHEL 5.2.

Comment 1 Matěj Cepl 2008-07-15 16:46:13 UTC
Looks interesting

Comment 2 Matěj Cepl 2008-07-15 16:46:27 UTC
*** Bug 443234 has been marked as a duplicate of this bug. ***

Comment 3 Matěj Cepl 2008-07-15 16:47:21 UTC
*** Bug 453607 has been marked as a duplicate of this bug. ***

Comment 4 Fedora Update System 2008-07-24 15:58:13 UTC
xorg-x11-server- has been submitted as an update for Fedora 8

Comment 5 Juliano F. Ravasi 2008-07-26 21:55:14 UTC
(In reply to comment #4)
> xorg-x11-server- has been submitted as an update for Fedora 8

Tested, it successfully fixed the Xorg crashes.

Comment 6 Matěj Cepl 2008-07-28 21:57:33 UTC
Thanks for letting us know.

Comment 7 Fedora Update System 2008-07-30 20:05:16 UTC
xorg-x11-server- has been pushed to the Fedora 8 stable repository.  If problems still persist, please make note of it in this bug report.

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