Bug 800593 (CVE-2012-1135)

Summary: CVE-2012-1135 freetype: heap off by one read in boundary check for NPUSHB and NPUSHW instructions in TTF BIC (#35640)
Product: [Other] Security Response Reporter: Jan Lieskovsky <jlieskov>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: behdad, fonts-bugs, jrusnack, kevin, mkasik
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2015-02-24 22:03:26 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 806270, 806271, 889398    
Bug Blocks: 800639    

Description Jan Lieskovsky 2012-03-06 18:52:59 UTC
An out-of heap-based buffer read flaw was found in the way TrueType bytecode / opcode interpreter of the FreeType font rendering engine performed execution of NPUSHB and NPUSHW instructions. 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/?35640

Upstream patch:
[2] http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=5dddcc45a03b336860436a180aec5b358517336b

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 20:53:21 UTC
Added CVE as per http://www.openwall.com/lists/oss-security/2012/03/06/16

Comment 2 Tomas Hoger 2012-03-15 09:28:05 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.