LibTIFF:heap buffer overflow in combineSeparateSamples24bits

Description


LibTIFF This software provides support for the Tag Image File Format (TIFF), a widely used format for storing image data. The latest version of the TIFF specification is available on-line in several different formats.

A heap buffer overflow was found in function combineSeparateSamples24bits in tiffcrop.c,which allows attackers to cause a denial of service via a crafted file.

#tiffcrop $FILE out.tif
=================================================================
==72026==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x62000000fff4 at pc 0x000000410c4b bp 0x7ffe43d35e30 sp 0x7ffe43d35e28
READ of size 1 at 0x62000000fff4 thread T0
    #0 0x410c4a in combineSeparateSamples24bits
/home/haojun/Downloads/testopensourcecode/tiff-4.0.7/tools/tiffcrop.c:4021
    #1 0x4157c8 in readSeparateStripsIntoBuffer
/home/haojun/Downloads/testopensourcecode/tiff-4.0.7/tools/tiffcrop.c:4889
    #2 0x41ebcb in loadImage
/home/haojun/Downloads/testopensourcecode/tiff-4.0.7/tools/tiffcrop.c:6175
    #3 0x40a743 in main
/home/haojun/Downloads/testopensourcecode/tiff-4.0.7/tools/tiffcrop.c:2345
    #4 0x7f730b2ffb34 in __libc_start_main (/lib64/libc.so.6+0x21b34)
    #5 0x402e28
(/home/haojun/Downloads/testopensourcecode/tiff-4.0.7_build/bin/tiffcrop+0x402e28)

0x62000000fff4 is located 0 bytes to the right of 3956-byte region
[0x62000000f080,0x62000000fff4)
allocated by thread T0 here:
    #0 0x7f730c0f3bb8 in __interceptor_malloc
../../../../libsanitizer/asan/asan_malloc_linux.cc:62
    #1 0x486286 in _TIFFmalloc
/home/haojun/Downloads/testopensourcecode/tiff-4.0.7/libtiff/tif_unix.c:316
    #2 0x4150a2 in readSeparateStripsIntoBuffer
/home/haojun/Downloads/testopensourcecode/tiff-4.0.7/tools/tiffcrop.c:4821
    #3 0x41ebcb in loadImage
/home/haojun/Downloads/testopensourcecode/tiff-4.0.7/tools/tiffcrop.c:6175
    #4 0x40a743 in main
/home/haojun/Downloads/testopensourcecode/tiff-4.0.7/tools/tiffcrop.c:2345
    #5 0x7f730b2ffb34 in __libc_start_main (/lib64/libc.so.6+0x21b34)

SUMMARY: AddressSanitizer: heap-buffer-overflow
/home/haojun/Downloads/testopensourcecode/tiff-4.0.7/tools/tiffcrop.c:4021 in
combineSeparateSamples24bits
Shadow bytes around the buggy address:
  0x0c407fff9fa0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c407fff9fb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c407fff9fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c407fff9fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c407fff9fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c407fff9ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00[04]fa
  0x0c407fffa000: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c407fffa010: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c407fffa020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c407fffa030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c407fffa040: 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
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  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
==72026==ABORTING

Affected version:4.0.7
Fixed version:N/A
Commit fix:N/A
Credit: ADLab of Venustech.
CVE:N/A
Reproducer:
Timeline:
2017-04-20:bug discovered and reported upstream bugzilla
2017-06-21:blog post about the issue
Permalink:

http://somevulnsofadlab.blogspot.com/2017/06/libtiffheap-buffer-overflow-in_21.html

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