Bug 800593 - (CVE-2012-1135) CVE-2012-1135 freetype: heap off by one read in boundary check for NPUSHB and NPUSHW instructions in TTF BIC (#35640)
CVE-2012-1135 freetype: heap off by one read in boundary check for NPUSHB and...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20120227,reported=2...
: Security
Depends On: 806270 806271 889398
Blocks: 800639
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Reported: 2012-03-06 13:52 EST by Jan Lieskovsky
Modified: 2015-07-31 11:21 EDT (History)
6 users (show)

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Doc Type: Bug Fix
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Last Closed: 2015-02-24 17:03:26 EST
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RHEL 7.3 requirements from Atomic Host:


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Description Jan Lieskovsky 2012-03-06 13:52:59 EST
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 15:53:21 EST
Added CVE as per http://www.openwall.com/lists/oss-security/2012/03/06/16
Comment 2 Tomas Hoger 2012-03-15 05:28:05 EDT
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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