Bug 800595 - (CVE-2012-1137) CVE-2012-1137 freetype: heap buffer off-by-one in BDF parsing _bdf_list_ensure() (#35643)
CVE-2012-1137 freetype: heap buffer off-by-one in BDF parsing _bdf_list_ensur...
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
low Severity low
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Assigned To: Red Hat Product Security
: Security
Depends On: 806266 806267 806268 806269 806270 806271 889398
Blocks: 800639
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Reported: 2012-03-06 13:54 EST by Jan Lieskovsky
Modified: 2016-11-08 11:18 EST (History)
5 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2015-02-24 16:02:30 EST
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Description Jan Lieskovsky 2012-03-06 13:54:29 EST
An out-of heap-based buffer read flaw was found in the way FreeType font rendering engine performed loading and parsing of file header information for glyph bitmap distribution format (BDF) font files. A remote attacker could provide a BDF font file with specially-crafted BDF header, which once processed in an application linked against FreeType would lead to that application crash.

Upstream bug report:
[1] https://savannah.nongnu.org/bugs/?35643

Upstream patch:
[2] http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=cee5d593582801f65c5e127d9de9ca24ebcdc747


Red Hat would like to thank Mateusz Jurczyk of the Google Security Team for reporting this issue.
Comment 1 Kurt Seifried 2012-03-06 15:55:33 EST
Added CVE as per http://www.openwall.com/lists/oss-security/2012/03/06/16
Comment 2 Tomas Hoger 2012-03-15 10:24:11 EDT
This is an issue in _bdf_list_ensure() in bdflib.c.  When allocating field[] array, a space for at least 4 items is allocated.  However, the rest of the code assume that field[] always has at least 5 items.  This leads to an off-by-one buffer over-read.  field[] items are char*, so this may cause program to use an uninitialized pointer for reading and possibly crash.
Comment 4 errata-xmlrpc 2012-04-10 15:59:09 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5
  Red Hat Enterprise Linux 6

Via RHSA-2012:0467 https://rhn.redhat.com/errata/RHSA-2012-0467.html

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