Project: gpac (gpac/gpac), language: c++
Vulnerability instance: gpac.cve-2023-0760
Sanitizer: address

================= Bug Report (1/1) ==================
## Source: Huntr
## URL: https://huntr.dev/bounties/d06223df-a473-4c82-96d0-23726b844b21
## Description:
Description
Heap Buffer Overflow in function gf_isom_box_size at src/isomedia/box_funcs.c:1997
gpac version
git log
commit bbca869177585aaca8eb66d8541079e6f364798e (HEAD -> master, origin/master, origin/HEAD)
Author: jeanlf <jeanlf@gpac.io>
Date:   Wed Jan 18 11:40:30 2023 +0100

    fixed potentially missing last packets in tsmux
POC
./MP4Box -bt ./poc_hbo01_s.dat
[iso file] Unknown top-level box type 0000
[iso file] Unknown top-level box type 0000
[iso file] Unknown top-level box type 0000
[iso file] Unknown box type 0000 in parent moov
[iso file] Unknown box type 0000 in parent mvex
[iso file] Read Box type 0000 (0x30303030) at position 544 has size 0 but is not at root/file level. Forbidden, skipping end of parent box !
[iso file] Box "mvex" (start 488) has 24 extra bytes
[iso file] Unknown box type 0000 in parent minf
[iso file] Unknown box type 0000 in parent minf
[iso file] Unknown box type 0000 in parent stbl
[iso file] Box "sgpd" (start 1154) has 8 extra bytes
[iso file] Missing DataInformationBox
[iso file] Track with no sample description box !
[iso file] Unknown box type 0000 in parent moov
[iso file] Unknown box type 0000 in parent moov
[iso file] Read Box type 0000 (0x30303030) at position 1261 has size 0 but is not at root/file level. Forbidden, skipping end of parent box !
[iso file] Box "moov" (start 351) has 655 extra bytes
[iso file] Unknown top-level box type 0000
[iso file] Unknown top-level box type 0000
[iso file] Unknown box type 0000 in parent moof
[iso file] Unknown box type 0000 in parent traf
[iso file] Box "sbgp" (start 2072) has 8 extra bytes
[iso file] Unknown box type 0000 in parent traf
[iso file] Unknown box type 0000 in parent traf
[iso file] Box "sgpd" (start 2168) has 12 extra bytes
[iso file] Unknown box type VOID in parent traf
[iso file] Read Box type 0000 (0x30303030) at position 2220 has size 0 but is not at root/file level. Forbidden, skipping end of parent box !
[iso file] Box "traf" (start 2028) has 406 extra bytes
[iso file] Unknown box type 0000 in parent moof
[iso file] default sample description set to 808464432 but only 0 sample description(s), likely broken ! Fixing to 1
[iso file] Box sgpd wrote 36 bytes but size is 48
=================================================================
==1805484==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602000001640 at pc 0x7ffff1d15327 bp 0x7fffffff2e10 sp 0x7fffffff2e08
READ of size 8 at 0x602000001640 thread T0
    #0 0x7ffff1d15326 in gf_isom_box_size /home/fuzz/gpac/src/isomedia/box_funcs.c:1997:9
    #1 0x7ffff1ed4247 in gf_isom_is_identical_sgpd /home/fuzz/gpac/src/isomedia/isom_read.c:5865:3
    #2 0x7ffff235419a in MergeTrack /home/fuzz/gpac/src/isomedia/track.c:913:11
    #3 0x7ffff1d9f8bd in MergeFragment /home/fuzz/gpac/src/isomedia/isom_intern.c:92:7
    #4 0x7ffff1dbc1d7 in gf_isom_parse_movie_boxes_internal /home/fuzz/gpac/src/isomedia/isom_intern.c:722:9
    #5 0x7ffff1da7ace in gf_isom_parse_movie_boxes /home/fuzz/gpac/src/isomedia/isom_intern.c:868:6
    #6 0x7ffff1dc3c43 in gf_isom_open_file /home/fuzz/gpac/src/isomedia/isom_intern.c:988:19
    #7 0x7ffff1df57ff in gf_isom_open /home/fuzz/gpac/src/isomedia/isom_read.c:509:11
    #8 0x540f28 in mp4box_main /home/fuzz/gpac/applications/mp4box/mp4box.c:6221:12
    #9 0x5540c1 in main /home/fuzz/gpac/applications/mp4box/mp4box.c:6846:1
    #10 0x7fffee1e1082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
    #11 0x42ac7d in _start (/home/fuzz/gpac/bin/gcc/MP4Box+0x42ac7d)

0x602000001640 is located 0 bytes to the right of 16-byte region [0x602000001630,0x602000001640)
allocated by thread T0 here:
    #0 0x4a5edd in malloc (/home/fuzz/gpac/bin/gcc/MP4Box+0x4a5edd)
    #1 0x7ffff03674e4 in gf_malloc /home/fuzz/gpac/src/utils/alloc.c:150:9
    #2 0x7ffff1b28192 in sgpd_parse_entry /home/fuzz/gpac/src/isomedia/box_code_base.c:9994:2
    #3 0x7ffff1b1ed19 in sgpd_box_read /home/fuzz/gpac/src/isomedia/box_code_base.c:10259:9
    #4 0x7ffff1d1093f in gf_isom_box_read /home/fuzz/gpac/src/isomedia/box_funcs.c:1897:9
    #5 0x7ffff1d0b2d6 in gf_isom_box_parse_ex /home/fuzz/gpac/src/isomedia/box_funcs.c:282:14
    #6 0x7ffff1d18173 in gf_isom_box_array_read /home/fuzz/gpac/src/isomedia/box_funcs.c:1790:7
    #7 0x7ffff1aa4de4 in traf_box_read /home/fuzz/gpac/src/isomedia/box_code_base.c:6363:13
    #8 0x7ffff1d1093f in gf_isom_box_read /home/fuzz/gpac/src/isomedia/box_funcs.c:1897:9
    #9 0x7ffff1d0b2d6 in gf_isom_box_parse_ex /home/fuzz/gpac/src/isomedia/box_funcs.c:282:14
    #10 0x7ffff1d18173 in gf_isom_box_array_read /home/fuzz/gpac/src/isomedia/box_funcs.c:1790:7
    #11 0x7ffff1a2723c in moof_box_read /home/fuzz/gpac/src/isomedia/box_code_base.c:3676:9
    #12 0x7ffff1d1093f in gf_isom_box_read /home/fuzz/gpac/src/isomedia/box_funcs.c:1897:9
    #13 0x7ffff1d0b2d6 in gf_isom_box_parse_ex /home/fuzz/gpac/src/isomedia/box_funcs.c:282:14
    #14 0x7ffff1d06ad9 in gf_isom_parse_root_box /home/fuzz/gpac/src/isomedia/box_funcs.c:38:8
    #15 0x7ffff1da93a5 in gf_isom_parse_movie_boxes_internal /home/fuzz/gpac/src/isomedia/isom_intern.c:378:7
    #16 0x7ffff1da7ace in gf_isom_parse_movie_boxes /home/fuzz/gpac/src/isomedia/isom_intern.c:868:6
    #17 0x7ffff1dc3c43 in gf_isom_open_file /home/fuzz/gpac/src/isomedia/isom_intern.c:988:19
    #18 0x7ffff1df57ff in gf_isom_open /home/fuzz/gpac/src/isomedia/isom_read.c:509:11
    #19 0x540f28 in mp4box_main /home/fuzz/gpac/applications/mp4box/mp4box.c:6221:12
    #20 0x5540c1 in main /home/fuzz/gpac/applications/mp4box/mp4box.c:6846:1
    #21 0x7fffee1e1082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/fuzz/gpac/src/isomedia/box_funcs.c:1997:9 in gf_isom_box_size
Shadow bytes around the buggy address:
  0x0c047fff8270: fa fa 00 00 fa fa 01 fa fa fa 00 00 fa fa 01 fa
  0x0c047fff8280: fa fa 00 00 fa fa 01 fa fa fa 00 00 fa fa 00 00
  0x0c047fff8290: fa fa 00 00 fa fa 00 00 fa fa 07 fa fa fa 00 00
  0x0c047fff82a0: fa fa 00 00 fa fa 00 fa fa fa 00 00 fa fa 00 00
  0x0c047fff82b0: fa fa 00 00 fa fa 00 fa fa fa 01 fa fa fa 00 00
=>0x0c047fff82c0: fa fa 00 00 fa fa 00 00[fa]fa 01 fa fa fa 00 00
  0x0c047fff82d0: fa fa 01 fa fa fa 00 00 fa fa 01 fa fa fa 00 00
  0x0c047fff82e0: fa fa 01 fa fa fa 00 00 fa fa 01 fa fa fa 00 00
  0x0c047fff82f0: fa fa 01 fa fa fa 00 00 fa fa 01 fa fa fa 00 00
  0x0c047fff8300: fa fa 01 fa fa fa 00 00 fa fa 01 fa fa fa 00 00
  0x0c047fff8310: fa fa 01 fa fa fa 00 00 fa fa 01 fa fa fa 00 00
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
  Shadow gap:              cc
==1805484==ABORTING
poc_hbo01_s.dat
Impact
This vulnerability is capable of crashing software, use unexpected value, or possible code execution.

Relevant Links:
https://github.com/gpac/gpac
https://github.com/JieyongMa/poc/raw/main/gpac/2023/poc_hbo01_s.dat

Build script:
#!/bin/bash -eu
# Minimized build script with only core build commands
set -eu
./configure --static-build --extra-cflags="${CFLAGS}" --extra-ldflags="${CFLAGS}"
make -j$(nproc)

Dockerfile:
FROM hwiwonlee/secb.base:latest
RUN apt-get update && apt-get install -y build-essential pkg-config libz-dev
RUN git clone https://github.com/gpac/gpac gpac
RUN git -C gpac checkout 8db20cb634a546c536c31caac94e1f74b778b463
WORKDIR $SRC/gpac
COPY build.sh $SRC/

Additional files: