libming:heap buffer overflow in decompileIF

Description

Ming is a library for generating Macromedia Flash files (.swf), written in C, and  for working includes useful utilities king with .swf files.

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

#swftocxx $FILE out
=================================================================
heap-buffer-overflow on address 0x6020000000a0 at pc 0x000000570171 bp 0x7fffe4c1cbe0 sp 0x7fffe4c1cbd8
READ of size 1 at 0x6020000000a0 thread T0
    #0 0x570170 in decompileIF /home/haojun/Downloads/libming-master/util/decompile.c:2369:79
    #1 0x5875eb in decompileActions /home/haojun/Downloads/libming-master/util/decompile.c:3401:6
    #2 0x5875eb in decompile5Action /home/haojun/Downloads/libming-master/util/decompile.c:3423
    #3 0x52a0c5 in outputSWF_DOACTION /home/haojun/Downloads/libming-master/util/outputscript.c:1548:29
    #4 0x531311 in readMovie /home/haojun/Downloads/libming-master/util/main.c:277:4
    #5 0x531311 in main /home/haojun/Downloads/libming-master/util/main.c:350
    #6 0x7f7029da9b34 in __libc_start_main /usr/src/debug/glibc-2.17-c758a686/csu/../csu/libc-start.c:274
    #7 0x41ae7b in _start (/home/haojun/Downloads/libming-afl-build/bin/swftocxx+0x41ae7b)

0x6020000000a0 is located 12 bytes to the right of 4-byte region [0x602000000090,0x602000000094)
allocated by thread T0 here:
    #0 0x4dfd76 in malloc /home/haojun/Downloads/llvm-clang/llvm/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:66
    #1 0x5d42e0 in readBytes /home/haojun/Downloads/libming-master/util/read.c:228:17
    #2 0x7f7029da9b34 in __libc_start_main /usr/src/debug/glibc-2.17-c758a686/csu/../csu/libc-start.c:274

heap-buffer-overflow /home/haojun/Downloads/libming-master/util/decompile.c:2369:79 in decompileIF
Shadow bytes around the buggy address:
  0x0c047fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff8000: fa fa 00 fa fa fa 02 fa fa fa 00 04 fa fa 01 fa
=>0x0c047fff8010: fa fa 04 fa[fa]fa 00 03 fa fa 07 fa fa fa 01 fa
  0x0c047fff8020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8060: 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
==15153==ABORTING

Affected version: latest version
Fixed version:N/A
Commit fix:N/A
Credit: ADLab of Venustech.
CVE:N/A
Reproducer:
Timeline:
2017-06-07:bug discovered and reported to the libming GitHub issue page
2017-07-24:blog post about the issue
Permalink:
https://somevulnsofadlab.blogspot.com/2017/07/libmingheap-buffer-overflow-in.html

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