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Bug 203172

Summary: vncserver PCF handling Integer overflow
Product: Red Hat Enterprise Linux 4 Reporter: Josh Bressers <bressers>
Component: vncAssignee: Adam Tkac <atkac>
Status: CLOSED ERRATA QA Contact: David Lawrence <dkl>
Severity: medium Docs Contact:
Priority: medium    
Version: 4.0CC: ovasik, xgl-maint
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: RHBA-2008-0685 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2008-07-24 19:35:52 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
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Description Flags
Proposed patch none

Description Josh Bressers 2006-08-18 19:13:02 UTC 
+++ This bug was initially created as a clone of Bug #202469 +++

An integer overflow was discovered in the way freetype processes malformed PCF
files.  It seems that Xorg also contains the same PCF processing code as
freetype, there it too is vulnerable this issue.

We initally described this issue for freetype in bug 190593.

The upstream bug is here:
https://bugs.freedesktop.org/show_bug.cgi?id=7535

-- Additional comment from bressers on 2006-08-14 14:09 EST --
The upstream patch is attachment 134155 [details]


-- Additional comment from bressers on 2006-08-15 20:42 EST --
Created an attachment (id=134276)
Demo font file


This issue also affects the vncserver shipped with RHEL2.1 and RHEL3
Comment 1 Marek Grac 2006-08-23 12:13:45 UTC 
Affected code is not in the VNC package
Comment 2 Josh Bressers 2006-08-23 12:35:07 UTC 
I can make the vnc server crash by using the demo font file.

Differnt issue perhaps?
Comment 3 Marek Grac 2006-08-24 14:06:34 UTC 
My fault, there were two files with same name and I have checked just one of
them.   After applying proposed patch the vncserver works correctly (xfontsel
crashes).
Comment 4 Josh Bressers 2006-08-25 18:44:48 UTC 
I've done some thinking about this and I'm removing the Security keyword.  There
is no way this can be considered a security issue, it's simply a bug.

The only way this is exploitable is if a bad font can be included in the
vncserver font path.  That means that an attacker already has access to the
account in question.
Comment 8 Adam Tkac 2007-07-04 09:48:28 UTC 
Created attachment 158511 [details]
Proposed patch
Comment 10 RHEL Program Management 2007-11-29 04:25:04 UTC 
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.
Comment 15 errata-xmlrpc 2008-07-24 19:35:52 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2008-0685.html