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FreeType 2.5.3 BDF parsing NULL pointer dereference in "_bdf_parse_glyphs" #188

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
The following NULL pointer dereference crash has been encountered in FreeType 
while fuzzing BDF fonts. It has been reproduced with the current version of 
freetype2 from master git branch, with a 64-bit build of the ftbench utility 
compiled with AddressSanitizer:

$ ftbench <file>

Attached are two POC files which trigger the condition.

ASAN:SIGSEGV
=================================================================
==8204==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 
0x00000084e7af sp 0x7fffb35ceba0 bp 0x7fffb35cffb0 T0)
    #0 0x84e7ae in _bdf_parse_glyphs freetype2/src/bdf/bdflib.c:1789
    #1 0x82cf2b in _bdf_readstream freetype2/src/bdf/bdflib.c:787
    #2 0x820895 in bdf_load_font freetype2/src/bdf/bdflib.c:2404
    #3 0x813c7a in BDF_Face_Init freetype2/src/bdf/bdfdrivr.c:364
    #4 0x4cc13e in open_face freetype2/src/base/ftobjs.c:1191
    #5 0x4c794b in FT_Open_Face freetype2/src/base/ftobjs.c:2123
    #6 0x4c5b58 in FT_New_Face freetype2/src/base/ftobjs.c:1254
    #7 0x491533 in get_face ft2demos-2.5.3/src/ftbench.c:705
    #8 0x48d748 in main ft2demos-2.5.3/src/ftbench.c:924

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV freetype2/src/bdf/bdflib.c:1789 
_bdf_parse_glyphs
==8204==ABORTING

Original issue reported on code.google.com by mjurc...@google.com on 21 Nov 2014 at 11:08

Attachments:

GoogleCodeExporter commented 9 years ago 
Reported in https://savannah.nongnu.org/bugs/?43660.

Original comment by mjurc...@google.com on 21 Nov 2014 at 11:40

GoogleCodeExporter commented 9 years ago 
Fixed in 
http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=af8346172a7b5
73715134f7a51e6c5c60fa7f2ab.

Original comment by mjurc...@google.com on 23 Nov 2014 at 11:15

GoogleCodeExporter commented 9 years ago 
All fixed by upstream:

FreeType 2.5.5

2014-12-30
FreeType 2.5.5 has been released. This is a minor bug fix release: All users of 
PCF fonts should update, since version 2.5.4 introduced a bug that prevented 
reading of such font files if not compressed.

FreeType 2.5.4

2014-12-06
FreeType 2.5.4 has been released. All users should upgrade due to another fix 
for vulnerability CVE-2014-2240 in the CFF driver. The library also contains a 
new round of patches for better protection against malformed fonts.

The main new feature, which is also one of the targets mentioned in the pledgie 
roadmap below, is auto-hinting support for Devanagari and Telugu, two widely 
used Indic scripts. A more detailed description of the remaining changes and 
fixes can be found here.

Original comment by cev...@google.com on 26 Jan 2015 at 5:27

GoogleCodeExporter commented 9 years ago

Original comment by mjurc...@google.com on 25 Feb 2015 at 1:57