heap-buffer-overflow in stbi__load_main at stb_image.h:5580

[SuhwanSong]

version : img2sixel 1.8.2

There is a heap-buffer-overflow in stbi__load_main at stb_image.h:5580
please run following cmd to reproduce it.

img2sixel --monochrome $PoC

poc
ASAN LOG

==9030==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602000004df1 at pc 0x0000004d90f2 bp 0x7ffc27974b30 sp 0x7ffc279742e0
READ of size 3 at 0x602000004df1 thread T0
    #0 0x4d90f1 in __asan_memcpy (/home/tmp/img2sixel+0x4d90f1)
    #1 0x7f3daf9e5623 in stbi__load_main /home/tmp/libsixel/src/./stb_image.h:5580:31
    #2 0x7f3daf938f1b in stbi__load_and_postprocess_8bit /home/tmp/libsixel/src/./stb_image.h:1090:19
    #3 0x7f3daf9877e7 in load_with_builtin /home/tmp/libsixel/src/loader.c:882:25
    #4 0x7f3daf9877e7 in sixel_helper_load_image_file /home/tmp/libsixel/src/loader.c:1352
    #5 0x7f3dafbd0d4f in sixel_encoder_encode /home/tmp/libsixel/src/encoder.c:1737:14
    #6 0x51787f in main /home/tmp/libsixel/converters/img2sixel.c:457:22
    #7 0x7f3dadf33b96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310
    #8 0x41a379 in _start (/home/tmp/img2sixel+0x41a379)

0x602000004df1 is located 0 bytes to the right of 1-byte region [0x602000004df0,0x602000004df1)
allocated by thread T0 here:
    #0 0x4da230 in __interceptor_malloc (/home/tmp/img2sixel+0x4da230)
    #1 0x7f3daf9e205a in stbi_malloc /home/tmp/libsixel/src/loader.c:76:12
    #2 0x7f3daf9e205a in stbi__malloc /home/tmp/libsixel/src/./stb_image.h:859
    #3 0x7f3daf9e205a in stbi__malloc_mad2 /home/tmp/libsixel/src/./stb_image.h:920
    #4 0x7f3daf9e205a in stbi__tga_load /home/tmp/libsixel/src/./stb_image.h:5527
    #5 0x7f3daf9e205a in stbi__load_main /home/tmp/libsixel/src/./stb_image.h:1011
    #6 0x7f3daf938f1b in stbi__load_and_postprocess_8bit /home/tmp/libsixel/src/./stb_image.h:1090:19
    #7 0x7f3daf9877e7 in load_with_builtin /home/tmp/libsixel/src/loader.c:882:25
    #8 0x7f3daf9877e7 in sixel_helper_load_image_file /home/tmp/libsixel/src/loader.c:1352
    #9 0x7f3dafbd0d4f in sixel_encoder_encode /home/tmp/libsixel/src/encoder.c:1737:14
    #10 0x51787f in main /home/tmp/libsixel/converters/img2sixel.c:457:22
    #11 0x7f3dadf33b96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310

SUMMARY: AddressSanitizer: heap-buffer-overflow (/home/tmp/img2sixel+0x4d90f1) in __asan_memcpy
Shadow bytes around the buggy address:
  0x0c047fff8960: fa fa fd fd fa fa fd fd fa fa fd fd fa fa fd fd
  0x0c047fff8970: fa fa fd fd fa fa fd fd fa fa fd fd fa fa fd fd
  0x0c047fff8980: fa fa fd fd fa fa fd fd fa fa fd fd fa fa fd fd
  0x0c047fff8990: fa fa fd fd fa fa fd fd fa fa fd fd fa fa fd fd
  0x0c047fff89a0: fa fa fd fd fa fa fd fd fa fa fd fd fa fa fd fd
=>0x0c047fff89b0: fa fa fd fd fa fa fd fd fa fa fd fd fa fa[01]fa
  0x0c047fff89c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff89d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff89e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff89f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8a00: 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
==9030==ABORTING

[carnil]

CVE-2019-19777 has been assigned to this issue.

[saitoha]

This problem is fixed on v1.8.3, with d6e34fc. Thanks.

[gutiniao]

CVE-2019-19777 has been sassigned to this issue.

Hello, I have some problems about cve sassigning. I submit some issues on CVE website.but i still don't recieve any reply about the issues after i got the request ID. If you known some reasons，you can send email to me(gutiniao666@hotmail.com).
Thanks