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Message-ID: <301376.256483735-sendEmail@localhost>
Date: Fri, 18 Aug 2017 13:54:06 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: graphicsmagick: use-after-free in ReadWMFImage (wmf.c)
Description:
graphicsmagick is a collection of tools and libraries for many image formats.
The complete ASan output of the issue:
# gm convert -negate -clip $FILE out
==24889==ERROR: AddressSanitizer: heap-use-after-free on address 0x60c0000005c0 at pc 0x7fca38d0da52 bp 0x7ffc6119c090 sp 0x7ffc6119c088
READ of size 8 at 0x60c0000005c0 thread T0
#0 0x7fca38d0da51 in ReadWMFImage /var/tmp/portage/media-gfx/graphicsmagick-1.3.26/work/GraphicsMagick-1.3.26/coders/wmf.c:2720:5
#1 0x7fca3e7e7e88 in ReadImage /var/tmp/portage/media-gfx/graphicsmagick-1.3.26/work/GraphicsMagick-1.3.26/magick/constitute.c:1607:13
#2 0x7fca3e67af18 in ConvertImageCommand /var/tmp/portage/media-gfx/graphicsmagick-1.3.26/work/GraphicsMagick-1.3.26/magick/command.c:4348:22
#3 0x7fca3e6b70c5 in MagickCommand /var/tmp/portage/media-gfx/graphicsmagick-1.3.26/work/GraphicsMagick-1.3.26/magick/command.c:8869:17
#4 0x7fca3e76285b in GMCommandSingle /var/tmp/portage/media-gfx/graphicsmagick-1.3.26/work/GraphicsMagick-1.3.26/magick/command.c:17396:10
#5 0x7fca3e75f991 in GMCommand /var/tmp/portage/media-gfx/graphicsmagick-1.3.26/work/GraphicsMagick-1.3.26/magick/command.c:17449:16
#6 0x7fca3cfca680 in __libc_start_main /var/tmp/portage/sys-libs/glibc-2.23-r4/work/glibc-2.23/csu/../csu/libc-start.c:289
#7 0x419cd8 in _init (/usr/bin/gm+0x419cd8)
0x60c0000005c0 is located 64 bytes inside of 120-byte region [0x60c000000580,0x60c0000005f8)
freed by thread T0 here:
#0 0x4cf4d0 in __interceptor_cfree /var/tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.1/work/compiler-rt-4.0.1.src/lib/asan/asan_malloc_linux.cc:55
#1 0x7fca38ac70cd in wmf_lite_destroy /var/tmp/portage/media-libs/libwmf-0.2.8.4-r6/work/libwmf-0.2.8.4/src/api.c:336
previously allocated by thread T0 here:
#0 0x4cf688 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 0x7fca38ac72f7 in wmf_malloc /var/tmp/portage/media-libs/libwmf-0.2.8.4-r6/work/libwmf-0.2.8.4/src/api.c:482
SUMMARY: AddressSanitizer: heap-use-after-free /var/tmp/portage/media-gfx/graphicsmagick-1.3.26/work/GraphicsMagick-1.3.26/coders/wmf.c:2720:5 in ReadWMFImage
Shadow bytes around the buggy address:
0x0c187fff8060: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
0x0c187fff8070: 00 00 00 00 00 00 00 00 fa fa fa fa fa fa fa fa
0x0c187fff8080: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c187fff8090: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
0x0c187fff80a0: 00 00 00 00 00 00 00 00 fa fa fa fa fa fa fa fa
=>0x0c187fff80b0: fd fd fd fd fd fd fd fd[fd]fd fd fd fd fd fd fa
0x0c187fff80c0: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
0x0c187fff80d0: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa
0x0c187fff80e0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c187fff80f0: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
0x0c187fff8100: 00 00 00 00 00 00 00 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
==24889==ABORTING
Affected version:
1.3.26
Fixed version:
N/A
Commit fix:
http://hg.code.sf.net/p/graphicsmagick/code/rev/be898b7c97bd
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-12936
Reproducer:
https://github.com/asarubbo/poc/blob/master/00302-graphicsmagick-UAF-ReadWMFImage
Timeline:
2017-07-14: bug discovered and reported to upstream
2017-07-26: upstream released a fix
2017-08-05: blog post about the issue
2017-08-18: 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/2017/08/05/graphicsmagick-use-after-free-in-readwmfimage-wmf-c/
--
Agostino Sarubbo
Gentoo Linux Developer
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