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Date: Wed, 16 Aug 2017 11:52:54 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: imagemagick: heap-based buffer overflow in .omp_outlined..32 (enhance.c)
Description:
imagemagick is a software suite to create, edit, compose, or convert bitmap images.
The complete ASan output of the issue:
# convert $FILE null
==109188==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6020000049f8 at pc 0x7f81ecd9b4c2 bp 0x7ffe3c52f850 sp 0x7ffe3c52f848
READ of size 8 at 0x6020000049f8 thread T0
#0 0x7f81ecd9b4c1 in .omp_outlined..32 /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/MagickCore/enhance.c:1248:13
#1 0x7f81eb8395c2 in __kmp_invoke_microtask /var/tmp/portage/sys-libs/libomp-4.0.1/work/openmp-4.0.1.src/runtime/src/z_Linux_asm.s:1399
#2 0x7f81eb7e125a in __kmp_fork_call /var/tmp/portage/sys-libs/libomp-4.0.1/work/openmp-4.0.1.src/runtime/src/kmp_runtime.cpp:1858
#3 0x7f81eb7cd74f in __kmpc_fork_call /var/tmp/portage/sys-libs/libomp-4.0.1/work/openmp-4.0.1.src/runtime/src/kmp_csupport.cpp:337
#4 0x7f81ecd999b9 in ContrastStretchImage /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/MagickCore/enhance.c:1213:11
#5 0x7f81ecbd2280 in SetImageType /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/MagickCore/attribute.c:1262:18
#6 0x7f81e5acd5bd in WriteTIFFImage /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/coders/tiff.c:3245:16
#7 0x7f81eccc4026 in WriteImage /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/MagickCore/constitute.c:1114:14
#8 0x7f81eccc55a9 in WriteImages /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/MagickCore/constitute.c:1333:13
#9 0x7f81ec50f456 in ConvertImageCommand /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/MagickWand/convert.c:3280:11
#10 0x7f81ec62e225 in MagickCommandGenesis /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/MagickWand/mogrify.c:183:14
#11 0x5093e9 in MagickMain /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/utilities/magick.c:149:10
#12 0x5093e9 in main /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/utilities/magick.c:180
#13 0x7f81eb206680 in __libc_start_main /var/tmp/portage/sys-libs/glibc-2.23-r4/work/glibc-2.23/csu/../csu/libc-start.c:289
#14 0x41a1f8 in _init (/usr/bin/magick+0x41a1f8)
0x6020000049f8 is located 0 bytes to the right of 8-byte region [0x6020000049f0,0x6020000049f8)
allocated by thread T0 here:
#0 0x4cfba8 in malloc /var/tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.1/work/compiler-rt-4.0.1.src/lib/asan/asan_malloc_linux.cc:66
#1 0x7f81ecef8df7 in AcquireMagickMemory /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/MagickCore/memory.c:464:10
#2 0x7f81ecef8df7 in AcquireQuantumMemory /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/MagickCore/memory.c:537
#3 0x7f81ecd97037 in ContrastStretchImage /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/MagickCore/enhance.c:1052:20
#4 0x7f81ecbd2280 in SetImageType /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/MagickCore/attribute.c:1262:18
#5 0x7f81e5acd5bd in WriteTIFFImage /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/coders/tiff.c:3245:16
#6 0x7f81eccc4026 in WriteImage /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/MagickCore/constitute.c:1114:14
#7 0x7f81eccc55a9 in WriteImages /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/MagickCore/constitute.c:1333:13
#8 0x7f81ec50f456 in ConvertImageCommand /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/MagickWand/convert.c:3280:11
#9 0x7f81ec62e225 in MagickCommandGenesis /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/MagickWand/mogrify.c:183:14
#10 0x5093e9 in MagickMain /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/utilities/magick.c:149:10
#11 0x5093e9 in main /var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/utilities/magick.c:180
#12 0x7f81eb206680 in __libc_start_main /var/tmp/portage/sys-libs/glibc-2.23-r4/work/glibc-2.23/csu/../csu/libc-start.c:289
SUMMARY: AddressSanitizer: heap-buffer-overflow
/var/tmp/portage/media-gfx/imagemagick-7.0.6.5/work/ImageMagick-7.0.6-5/MagickCore/enhance.c:1248:13 in .omp_outlined..32
Shadow bytes around the buggy address:
0x0c047fff88e0: fa fa fd fd fa fa fd fd fa fa fd fd fa fa fd fd
0x0c047fff88f0: fa fa fd fd fa fa fd fd fa fa fd fd fa fa fd fd
0x0c047fff8900: fa fa fd fd fa fa fd fd fa fa fd fd fa fa fd fd
0x0c047fff8910: fa fa fd fd fa fa fd fd fa fa fd fd fa fa fd fd
0x0c047fff8920: fa fa 00 03 fa fa 00 04 fa fa 05 fa fa fa 00 00
=>0x0c047fff8930: fa fa 00 07 fa fa 00 04 fa fa 00 04 fa fa 00[fa]
0x0c047fff8940: fa fa 00 fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8950: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8960: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8970: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8980: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==109188==ABORTING
Affected version:
7.0.6-5
Fixed version:
7.0.6-6 (not released atm)
Commit fix:
https://github.com/ImageMagick/ImageMagick/commit/1cc6f0ccc92c20c7cab6c4a7335daf29c91f0d8e
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-12876
Reproducer:
https://github.com/asarubbo/poc/blob/master/00306-imagemagick-heapoverflow-enhance_c
Timeline:
2017-08-09: bug discovered and reported to upstream
2017-08-10: blog post about the issue
2017-08-15: CVE assigned
Note:
This bug was found with American Fuzzy Lop.
This bug was identified with bare metal servers donated by Packet. This work is also supported by the Core Infrastructure Initiative.
Permalink:
https://blogs.gentoo.org/ago/2017/08/10/imagemagick-heap-based-buffer-overflow-in-omp_outlined-32-enhance-c/
--
Agostino Sarubbo
Gentoo Linux Developer
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