Description

Null pointer dereference caused segmentation fault. This can cause Denial-of -service attack.

version

smlijun@ubuntu:~/gpac_asan/bin/gcc$ ./MP4Box -version
MP4Box - GPAC version 2.1-DEV-rev243-gf87b12b32-master
(c) 2000-2022 Telecom Paris distributed under LGPL v2.1+ - http://gpac.io

Please cite our work in your research:
    GPAC Filters: https://doi.org/10.1145/3339825.3394929
    GPAC: https://doi.org/10.1145/1291233.1291452

GPAC Configuration: 
Features: GPAC_CONFIG_LINUX GPAC_64_BITS GPAC_HAS_IPV6 GPAC_HAS_SOCK_UN GPAC_MINIMAL_ODF GPAC_HAS_QJS GPAC_HAS_LINUX_DVB  GPAC_DISABLE_3D 

Proof of Concept

PoC is available herePoC

#Asan Log

smlijun@ubuntu:~/gpac_asan/bin/gcc$ ./MP4Box -bt ../../../gpac/bin/gcc/poc 
[iso file] Unknown box type 0000 in parent moov
[iso file] Unknown box type 0000 in parent moov
[iso file] Unknown box type 0000 in parent moov
[iso file] Unknown box type 0000 in parent moov
[iso file] Unknown box type 0000 in parent moov
[iso file] Unknown box type 0000 in parent moov
[iso file] Unknown box type 0000 in parent minf
[iso file] Missing DataInformationBox
[iso file] Unknown box type 0000 in parent moov
[iso file] Read Box type 0000 (0x30303030) at position 11542 has size 0 but is not at root/file level. Forbidden, skipping end of parent box !
[iso file] Box "moov" (start 20) has 806 extra bytes
[iso file] Unknown top-level box type 0000
[iso file] Incomplete box 0000 - start 12356 size 808358436
[iso file] Incomplete file while reading for dump - aborting parsing
[iso file] Unknown box type 0000 in parent moov
[iso file] Unknown box type 0000 in parent moov
[iso file] Unknown box type 0000 in parent moov
[iso file] Unknown box type 0000 in parent moov
[iso file] Unknown box type 0000 in parent moov
[iso file] Unknown box type 0000 in parent moov
[iso file] Unknown box type 0000 in parent minf
[iso file] Missing DataInformationBox
[iso file] Unknown box type 0000 in parent moov
[iso file] Read Box type 0000 (0x30303030) at position 11542 has size 0 but is not at root/file level. Forbidden, skipping end of parent box !
[iso file] Box "moov" (start 20) has 806 extra bytes
[iso file] Unknown top-level box type 0000
[iso file] Incomplete box 0000 - start 12356 size 808358436
[iso file] Incomplete file while reading for dump - aborting parsing
MPEG-4 BIFS Scene Parsing
[ODF] Reading bifs config: shift in sizes (not supported)
[MP4 Loading] Unable to fetch sample 38 from track ID 8 - aborting track import
Scene loaded - dumping 1 systems streams
AddressSanitizer:DEADLYSIGNAL
=================================================================
==3541124==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7fa63fcdc018 bp 0x60b0000007d0 sp 0x7fff0a6821a0 T0)
==3541124==The signal is caused by a READ memory access.
==3541124==Hint: address points to the zero page.
    #0 0x7fa63fcdc017 in gf_dump_vrml_simple_field.isra.0 (/home/smlijun/gpac_asan/bin/gcc/libgpac.so.12+0x38f017)
    #1 0x7fa63fcdcc1b in DumpXReplace (/home/smlijun/gpac_asan/bin/gcc/libgpac.so.12+0x38fc1b)
    #2 0x7fa63fcd728a in gf_sm_dump_command_list (/home/smlijun/gpac_asan/bin/gcc/libgpac.so.12+0x38a28a)
    #3 0x7fa63fcde00c in gf_sm_dump (/home/smlijun/gpac_asan/bin/gcc/libgpac.so.12+0x39100c)
    #4 0x559fd823f0b7 in dump_isom_scene (/home/smlijun/gpac_asan/bin/gcc/MP4Box+0x340b7)
    #5 0x559fd8234b50 in mp4box_main (/home/smlijun/gpac_asan/bin/gcc/MP4Box+0x29b50)
    #6 0x7fa63f77f082 in __libc_start_main ../csu/libc-start.c:308
    #7 0x559fd822458d in _start (/home/smlijun/gpac_asan/bin/gcc/MP4Box+0x1958d)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/home/smlijun/gpac_asan/bin/gcc/libgpac.so.12+0x38f017) in gf_dump_vrml_simple_field.isra.0
==3541124==ABORTING

Impact

This vuln is capable of DoS.