An issue was discovered in gpac before 1.0.1. The abst_box_read function in box_code_adobe.c has a heap-based buffer over-read.
## System info

Ubuntu x86_64, gcc (Ubuntu 5.5.0-12ubuntu1), MP4Box (latest master [2aa266](https://github.com/gpac/gpac/commit/2aa266dfaab6aaad9f9f4f216ad7d1e62adc7fa0))

## Configure

CFLAGS="-g -fsanitize=address" LDFLAGS="-fsanitize=address" ./configure --static-mp4box

## Command line

./bin/gcc/MP4Box -diso -out /dev/null @@

## AddressSanitizer output

```
=================================================================
==24631==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200000e114 at pc 0x7f2a609a93d5 bp 0x7ffe7daf8840 sp 0x7ffe7daf7fe8
READ of size 5 at 0x60200000e114 thread T0
    #0 0x7f2a609a93d4 in strdup (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x623d4)
    #1 0x55979e0874b7 in abst_box_read isomedia/box_code_adobe.c:124
    #2 0x55979de76b64 in gf_isom_box_read isomedia/box_funcs.c:1681
    #3 0x55979de76b64 in gf_isom_box_parse_ex isomedia/box_funcs.c:259
    #4 0x55979de78041 in gf_isom_parse_root_box isomedia/box_funcs.c:38
    #5 0x55979deaf6f5 in gf_isom_parse_movie_boxes isomedia/isom_intern.c:259
    #6 0x55979deba951 in gf_isom_parse_movie_boxes isomedia/isom_intern.c:247
    #7 0x55979deba951 in gf_isom_open_file isomedia/isom_intern.c:740
    #8 0x55979d7e47e3 in mp4boxMain /home/seviezhou/gpac/applications/mp4box/main.c:5331
    #9 0x7f2a5f973b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #10 0x55979d7b5f09 in _start (/home/seviezhou/gpac/bin/gcc/MP4Box+0x27ff09)

0x60200000e114 is located 0 bytes to the right of 4-byte region [0x60200000e110,0x60200000e114)
allocated by thread T0 here:
    #0 0x7f2a609df612 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98612)
    #1 0x55979e0853a9 in abst_box_read isomedia/box_code_adobe.c:97

SUMMARY: AddressSanitizer: heap-buffer-overflow ??:0 strdup
Shadow bytes around the buggy address:
  0x0c047fff9bd0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9be0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9bf0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9c00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9c10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa 02 fa
=>0x0c047fff9c20: fa fa[04]fa fa fa 00 00 fa fa 00 00 fa fa 00 00
  0x0c047fff9c30: fa fa 00 00 fa fa 00 00 fa fa fd fa fa fa 00 fa
  0x0c047fff9c40: fa fa 00 00 fa fa 00 00 fa fa 00 07 fa fa fd fa
  0x0c047fff9c50: fa fa 00 02 fa fa 04 fa fa fa fd fa fa fa 07 fa
  0x0c047fff9c60: fa fa fd fa fa fa 05 fa fa fa fd fa fa fa 00 fa
  0x0c047fff9c70: fa fa fd fa fa fa 07 fa fa fa fd fa fa fa 07 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
==24631==ABORTING
```

## POC

[heap-overflow-abst_box_read-box_code_adobe-124.zip](https://github.com/gpac/gpac/files/5039356/heap-overflow-abst_box_read-box_code_adobe-124.zip)

A heap-buffer-overflow in box_code_adobe.c:124
This is a GitHub Issue
repo:gpac
owner:gpac
Title : A heap-buffer-overflow in box_code_adobe.c:124
Issue date:

--- start body ---
## System info

Ubuntu x86_64, gcc (Ubuntu 5.5.0-12ubuntu1), MP4Box (latest master [2aa266](https://github.com/gpac/gpac/commit/2aa266dfaab6aaad9f9f4f216ad7d1e62adc7fa0))

## Configure

CFLAGS="-g -fsanitize=address" LDFLAGS="-fsanitize=address" ./configure --static-mp4box

## Command line

./bin/gcc/MP4Box -diso -out /dev/null @@

## AddressSanitizer output

```
=================================================================
==24631==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200000e114 at pc 0x7f2a609a93d5 bp 0x7ffe7daf8840 sp 0x7ffe7daf7fe8
READ of size 5 at 0x60200000e114 thread T0
    #0 0x7f2a609a93d4 in strdup (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x623d4)
    #1 0x55979e0874b7 in abst_box_read isomedia/box_code_adobe.c:124
    #2 0x55979de76b64 in gf_isom_box_read isomedia/box_funcs.c:1681
    #3 0x55979de76b64 in gf_isom_box_parse_ex isomedia/box_funcs.c:259
    #4 0x55979de78041 in gf_isom_parse_root_box isomedia/box_funcs.c:38
    #5 0x55979deaf6f5 in gf_isom_parse_movie_boxes isomedia/isom_intern.c:259
    #6 0x55979deba951 in gf_isom_parse_movie_boxes isomedia/isom_intern.c:247
    #7 0x55979deba951 in gf_isom_open_file isomedia/isom_intern.c:740
    #8 0x55979d7e47e3 in mp4boxMain /home/seviezhou/gpac/applications/mp4box/main.c:5331
    #9 0x7f2a5f973b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #10 0x55979d7b5f09 in _start (/home/seviezhou/gpac/bin/gcc/MP4Box+0x27ff09)

0x60200000e114 is located 0 bytes to the right of 4-byte region [0x60200000e110,0x60200000e114)
allocated by thread T0 here:
    #0 0x7f2a609df612 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98612)
    #1 0x55979e0853a9 in abst_box_read isomedia/box_code_adobe.c:97

SUMMARY: AddressSanitizer: heap-buffer-overflow ??:0 strdup
Shadow bytes around the buggy address:
  0x0c047fff9bd0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9be0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9bf0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9c00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9c10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa 02 fa
=>0x0c047fff9c20: fa fa[04]fa fa fa 00 00 fa fa 00 00 fa fa 00 00
  0x0c047fff9c30: fa fa 00 00 fa fa 00 00 fa fa fd fa fa fa 00 fa
  0x0c047fff9c40: fa fa 00 00 fa fa 00 00 fa fa 00 07 fa fa fd fa
  0x0c047fff9c50: fa fa 00 02 fa fa 04 fa fa fa fd fa fa fa 07 fa
  0x0c047fff9c60: fa fa fd fa fa fa 05 fa fa fa fd fa fa fa 00 fa
  0x0c047fff9c70: fa fa fd fa fa fa 07 fa fa fa fd fa fa fa 07 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
==24631==ABORTING
```

## POC

[heap-overflow-abst_box_read-box_code_adobe-124.zip](https://github.com/gpac/gpac/files/5039356/heap-overflow-abst_box_read-box_code_adobe-124.zip)

--- end body ---

A heap buffer overflow vulnerability in the `abst_box_read` function of `box_code_adobe.c` in GPAC allows attackers to exploit memory corruption, potentially leading to arbitrary code execution or application crashes. The issue arises when the function attempts to read beyond the allocated memory, as indicated by the AddressSanitizer output.