Bug 800597 (CVE-2012-1138) - CVE-2012-1138 freetype: heap OOB read in the MIRP instruction implementation in TTF BCI (#35646)
Summary: CVE-2012-1138 freetype: heap OOB read in the MIRP instruction implementation ...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2012-1138
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 806270 806271 889398
Blocks: 800639
TreeView+ depends on / blocked
 
Reported: 2012-03-06 18:55 UTC by Jan Lieskovsky
Modified: 2019-09-29 12:50 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-02-24 22:03:35 UTC


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Description Jan Lieskovsky 2012-03-06 18:55:15 UTC
An out-of heap-based buffer read flaw was found in the way TrueType bytecode / opcode interpreter of FreeType font rendering engine executed the 'Move Indirect Relative Point' (MIRP) instruction. A remote attacker could provide a specially-crafted font file, which once opened in an application linked against FreeType would lead to that application crash.

Upstream bug report:
[1] https://savannah.nongnu.org/bugs/?35646

Upstream patch:
[2] http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=a33c013fe2dc6e65de2879682201d9c155292349

Acknowledgements:

Red Hat would like to thank Mateusz Jurczyk of the Google Security Team for reporting this issue.

Comment 1 Kurt Seifried 2012-03-06 20:56:01 UTC
Added CVE as per http://www.openwall.com/lists/oss-security/2012/03/06/16

Comment 2 Tomas Hoger 2012-03-14 17:27:57 UTC
This flaw is in the TrueType bytecode interpreter (BCI) implementation.  BCI is not enabled in Red Hat Enterprise Linux 4, 5, and 6 freetype packages (it was disabled by default upstream because of the patent concerns).  BCI support is now enabled by default in upstream versions 2.4 and later, as relevant patents expired: http://www.freetype.org/patents.html

Statement:

Not vulnerable. This issue did not affect freetype packages as shipped with Red Hat Enterprise Linux 5 and 6, as they do not enable TrueType bytecode interpreter.


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