heap-buffer-overflow in /gpac/src/media_tools/m3u8.c:1239:13 in gf_m3u8_parse_sub_playlist

[gandalf4a]

Version

$ ./MP4Box -version
MP4Box - GPAC version 2.3-DEV-rev566-g50c2ab06f-master

Platform

$ uname -a
Linux user-GE40-2PC-Dragon-Eyes 6.2.0-33-generic #33~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Sep  7 10:33:52 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

Asan

/home/user/vul/MP4Box_crash/id000003sig06src000693time10932099execs107049ophavocrep8
=================================================================
==823268==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602000001ea0 at pc 0x7fd156d00a7c bp 0x7ffd836ab610 sp 0x7ffd836ab608
READ of size 8 at 0x602000001ea0 thread T0
    #0 0x7fd156d00a7b in gf_m3u8_parse_sub_playlist /home/user/fuzzing_gpac/gpac/src/media_tools/m3u8.c:1239:13
    #1 0x7fd156d18174 in gf_m3u8_to_mpd /home/user/fuzzing_gpac/gpac/src/media_tools/mpd.c:2230:6
    #2 0x7fd156d5ad99 in gf_dash_open /home/user/fuzzing_gpac/gpac/src/media_tools/dash_client.c:8506:8
    #3 0x7fd1574e97fe in dashdmx_configure_pid /home/user/fuzzing_gpac/gpac/src/filters/dmx_dash.c:1973:7
    #4 0x7fd15730740c in gf_filter_pid_configure /home/user/fuzzing_gpac/gpac/src/filter_core/filter_pid.c:876:6
    #5 0x7fd1573262a6 in gf_filter_pid_connect_task /home/user/fuzzing_gpac/gpac/src/filter_core/filter_pid.c:1230:3
    #6 0x7fd15737d47b in gf_fs_thread_proc /home/user/fuzzing_gpac/gpac/src/filter_core/filter_session.c:2105:3
    #7 0x7fd15737b5cf in gf_fs_run /home/user/fuzzing_gpac/gpac/src/filter_core/filter_session.c:2405:3
    #8 0x7fd156c2ac6a in gf_dasher_process /home/user/fuzzing_gpac/gpac/src/media_tools/dash_segmenter.c:1236:6
    #9 0x564c90dad6dc in do_dash /home/user/fuzzing_gpac/gpac/applications/mp4box/mp4box.c:4831:15
    #10 0x564c90d9eb6e in mp4box_main /home/user/fuzzing_gpac/gpac/applications/mp4box/mp4box.c:6245:7
    #11 0x7fd155c29d8f in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    #12 0x7fd155c29e3f in __libc_start_main csu/../csu/libc-start.c:392:3
    #13 0x564c90cc6dd4 in _start (/home/user/fuzzing_gpac/gpac/bin/gcc/MP4Box+0x82dd4) (BuildId: 53333ca7bff59dd9a3d1b2821e7c5f3a9aac76b9)

0x602000001ea0 is located 0 bytes to the right of 16-byte region [0x602000001e90,0x602000001ea0)
allocated by thread T0 here:
    #0 0x564c90d49e08 in __interceptor_calloc (/home/user/fuzzing_gpac/gpac/bin/gcc/MP4Box+0x105e08) (BuildId: 53333ca7bff59dd9a3d1b2821e7c5f3a9aac76b9)
    #1 0x7fd156d043c0 in extract_attributes /home/user/fuzzing_gpac/gpac/src/media_tools/m3u8.c:329:8

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/user/fuzzing_gpac/gpac/src/media_tools/m3u8.c:1239:13 in gf_m3u8_parse_sub_playlist
Shadow bytes around the buggy address:
  0x0c047fff8380: fa fa 00 00 fa fa 00 00 fa fa fd fd fa fa fd fd
  0x0c047fff8390: fa fa 07 fa fa fa 05 fa fa fa 00 00 fa fa 00 00
  0x0c047fff83a0: fa fa 00 00 fa fa 00 00 fa fa 00 00 fa fa 00 03
  0x0c047fff83b0: fa fa 00 00 fa fa 00 00 fa fa 00 00 fa fa 00 00
  0x0c047fff83c0: fa fa 00 00 fa fa 00 00 fa fa 00 00 fa fa 00 00
=>0x0c047fff83d0: fa fa 00 00[fa]fa fd fa fa fa fa fa fa fa fa fa
  0x0c047fff83e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff83f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8400: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8410: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8420: 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
==823268==ABORTING

Reproduce

./MP4Box -dash 10000 poc

POC File

https://github.com/gandalf4a/crash_report/blob/main/gpac/MP4Box/hbo_1239

Credit

Gandalf4a