Menu

#436 heap buffer overflow in GetStyleTokens

v1.0_(example)
closed-fixed
None
5
2017-08-22
2017-08-12
bestshow
No

On GraphicsMagick 1.3.26 2017-07-04 Q8

A heap buffer overflow vulnerability was found in function GetStyleTokens,which allow attackers to cause a denial of service via a crafted file.

#./gm identify $FILE
=================================================================
==129128==ERROR: heap-buffer-overflow on address 0x602000000560 at pc 0x000000d8d769 bp 0x7ffd5555a7b0 sp 0x7ffd5555a7a8
WRITE of size 8 at 0x602000000560 thread T0
    #0 0xd8d768 in GetStyleTokens /home/test/Downloads/GraphicsMagick-1.3.26/coders/svg.c:311:12
    #1 0xd8d768 in SVGStartElement /home/test/Downloads/GraphicsMagick-1.3.26/coders/svg.c:1666
    #2 0x7fb47d34ace4 in xmlParseStartTag (/lib64/libxml2.so.2+0x42ce4)
    #3 0x7fb47d358632  (/lib64/libxml2.so.2+0x50632)
    #4 0x7fb47d35961d in xmlParseChunk (/lib64/libxml2.so.2+0x5161d)
    #5 0xd7cb30 in ReadSVGImage /home/test/Downloads/GraphicsMagick-1.3.26/coders/svg.c:2959:14
    #6 0x63f90d in ReadImage /home/test/Downloads/GraphicsMagick-1.3.26/magick/constitute.c:1607:13
    #7 0x63ed64 in PingImage /home/test/Downloads/GraphicsMagick-1.3.26/magick/constitute.c:1370:9
    #8 0x5ab160 in IdentifyImageCommand /home/test/Downloads/GraphicsMagick-1.3.26/magick/command.c:8379:17
    #9 0x5b0232 in MagickCommand /home/test/Downloads/GraphicsMagick-1.3.26/magick/command.c:8869:17
    #10 0x5f621e in GMCommandSingle /home/test/Downloads/GraphicsMagick-1.3.26/magick/command.c:17396:10
    #11 0x5f4aab in GMCommand /home/test/Downloads/GraphicsMagick-1.3.26/magick/command.c:17449:16
    #12 0x7fb47c212b34 in __libc_start_main /usr/src/debug/glibc-2.17-c758a686/csu/../csu/libc-start.c:274
    #13 0x4247fb in _start (/home/test/Downloads/IM-GM-build/bin/gm+0x4247fb)

0x602000000560 is located 0 bytes to the right of 16-byte region [0x602000000550,0x602000000560)
allocated by thread T0 here:
    #0 0x4e96f6 in __interceptor_malloc /home/test/Downloads/llvm-clang/llvm/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:66
    #1 0xd885f9 in GetStyleTokens /home/test/Downloads/GraphicsMagick-1.3.26/coders/svg.c:290:10
    #2 0xd885f9 in SVGStartElement /home/test/Downloads/GraphicsMagick-1.3.26/coders/svg.c:1666
    #3 0x7fb47d34ace4 in xmlParseStartTag (/lib64/libxml2.so.2+0x42ce4)

heap-buffer-overflow /home/test/Downloads/GraphicsMagick-1.3.26/coders/svg.c:311:12 in GetStyleTokens
Shadow bytes around the buggy address:
  0x0c047fff8050: fa fa 00 01 fa fa 00 01 fa fa 07 fa fa fa 00 03
  0x0c047fff8060: fa fa 06 fa fa fa 00 01 fa fa 05 fa fa fa fd fa
  0x0c047fff8070: fa fa 00 02 fa fa 00 02 fa fa 00 01 fa fa 04 fa
  0x0c047fff8080: fa fa 00 01 fa fa 02 fa fa fa 01 fa fa fa 01 fa
  0x0c047fff8090: fa fa fd fd fa fa fd fa fa fa fd fa fa fa fd fa
=>0x0c047fff80a0: fa fa fd fa fa fa 02 fa fa fa 00 00[fa]fa fa fa
  0x0c047fff80b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff80c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff80d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff80e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff80f0: 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

The poc file is in the attachment.

Credit: ADLab of Venustech

1 Attachments

Discussion

  • Bob Friesenhahn

    Bob Friesenhahn - 2017-08-16
    • status: open --> closed-fixed
    • assigned_to: Bob Friesenhahn
     
  • Bob Friesenhahn

    Bob Friesenhahn - 2017-08-16

    Fixed by Mercurial changeset 15121:54f48ab2d52a.

     
  • Henri Salo

    Henri Salo - 2017-08-22

    Please use CVE-2017-13064 for this issue.

     

Log in to post a comment.