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A heap-buffer-overflow in swfaction.c:398 #116

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seviezhou opened this issue Aug 5, 2020 · 0 comments
Open

A heap-buffer-overflow in swfaction.c:398 #116

seviezhou opened this issue Aug 5, 2020 · 0 comments

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@seviezhou
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seviezhou commented Aug 5, 2020

System info

Ubuntu x86_64, clang 6.0, swfdump (latest master fad6c2)

Command line

./src/swfdump -D @@

AddressSanitizer output

=================================================================
==11451==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60400000dfbd at pc 0x5641d3a2a305 bp 0x7ffe12b4fe00 sp 0x7ffe12b4fdf0
READ of size 1 at 0x60400000dfbd thread T0
    #0 0x5641d3a2a304 in swf_DumpActions modules/swfaction.c:398
    #1 0x5641d3a156bd in main /home/seviezhou/swftools/src/swfdump.c:1585
    #2 0x7fc31ff26b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #3 0x5641d3a19439 in _start (/home/seviezhou/swftools/src/swfdump+0xd0439)

0x60400000dfbd is located 1 bytes to the right of 44-byte region [0x60400000df90,0x60400000dfbc)
allocated by thread T0 here:
    #0 0x7fc3205ab612 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98612)
    #1 0x5641d3b54ca7 in rfx_alloc /home/seviezhou/swftools/lib/mem.c:30
    #2 0x7ffe12b5248f  (<unknown module>)

SUMMARY: AddressSanitizer: heap-buffer-overflow modules/swfaction.c:398 swf_DumpActions
Shadow bytes around the buggy address:
  0x0c087fff9ba0: fa fa fa fa fa fa fa fa fa fa 00 00 00 00 00 00
  0x0c087fff9bb0: fa fa 00 00 00 00 00 00 fa fa 00 00 00 00 00 00
  0x0c087fff9bc0: fa fa 00 00 00 00 00 00 fa fa 00 00 00 00 00 00
  0x0c087fff9bd0: fa fa 00 00 00 00 00 00 fa fa 00 00 00 00 00 00
  0x0c087fff9be0: fa fa 00 00 00 00 00 02 fa fa 00 00 00 00 00 00
=>0x0c087fff9bf0: fa fa 00 00 00 00 00[04]fa fa 00 00 00 00 00 00
  0x0c087fff9c00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c087fff9c10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c087fff9c20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c087fff9c30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c087fff9c40: 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
==11451==ABORTING

POC

heap-overflow-swf_DumpActions-swfaction-398.zip

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