GPAC MP4box 2.1-DEV-rev574-g9d5bb184b is vulnerable to Buffer overflow in hevc_parse_vps_extension function of media_tools/av_parsers.c
Thanks for reporting your issue. Please make sure these boxes are checked before submitting your issue - thank you!

- [X] I looked for a similar issue and couldn't find any.
- [X] I tried with the latest version of GPAC. Installers available at http://gpac.io/downloads/gpac-nightly-builds/
- [X] I give enough information for contributors to reproduce my issue (meaningful title, github labels, platform and compiler, command-line ...). I can share files anonymously with this dropbox: https://www.mediafire.com/filedrop/filedrop_hosted.php?drop=eec9e058a9486fe4e99c33021481d9e1826ca9dbc242a6cfaab0fe95da5e5d95

Detailed guidelines: http://gpac.io/2013/07/16/how-to-file-a-bug-properly/

# Description

Buffer overflow in hevc_parse_vps_extension function of media_tools/av_parsers.c

```c
for (i = 0; i < (num_scalability_types - splitting_flag); i++) {
  dimension_id_len[i] = 1 + gf_bs_read_int_log_idx(bs, 3, "dimension_id_len_minus1", i); // overflow at dimension_id_len
}
```

# Version info

```
MP4Box - GPAC version 2.1-DEV-rev574-g9d5bb184b-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: --enable-sanitizer
Features: GPAC_CONFIG_LINUX GPAC_64_BITS GPAC_HAS_IPV6 GPAC_HAS_SSL GPAC_HAS_SOCK_UN GPAC_MINIMAL_ODF GPAC_HAS_QJS GPAC_HAS_LINUX_DVB  GPAC_DISABLE_3D
```

# Reproduce

compile and run

```
./configure --enable-sanitizer
make
./MP4Box import -add poc_bof6.mp4
```

Crash reported by sanitizer

```
[Core] exp-golomb read failed, not enough bits in bitstream !
[HEVC] Warning: Error parsing NAL unit
media_tools/av_parsers.c:7633:19: runtime error: index 16 out of bounds for type 'u8 [16]'
```

# POC

[poc_bof6.zip](https://github.com/gpac/gpac/files/10202354/poc_bof6.zip)


# Impact

Potentially causing DoS and RCE

# Credit 

Xdchase
Buffer overflow in hevc_parse_vps_extension function of media_tools/av_parsers.c
This is a GitHub Issue
repo:gpac
owner:gpac
Title : Buffer overflow in hevc_parse_vps_extension function of media_tools/av_parsers.c
Issue date:

--- start body ---
Thanks for reporting your issue. Please make sure these boxes are checked before submitting your issue - thank you!

- [X] I looked for a similar issue and couldn't find any.
- [X] I tried with the latest version of GPAC. Installers available at http://gpac.io/downloads/gpac-nightly-builds/
- [X] I give enough information for contributors to reproduce my issue (meaningful title, github labels, platform and compiler, command-line ...). I can share files anonymously with this dropbox: https://www.mediafire.com/filedrop/filedrop_hosted.php?drop=eec9e058a9486fe4e99c33021481d9e1826ca9dbc242a6cfaab0fe95da5e5d95

Detailed guidelines: http://gpac.io/2013/07/16/how-to-file-a-bug-properly/

# Description

Buffer overflow in hevc_parse_vps_extension function of media_tools/av_parsers.c

```c
for (i = 0; i < (num_scalability_types - splitting_flag); i++) {
  dimension_id_len[i] = 1 + gf_bs_read_int_log_idx(bs, 3, "dimension_id_len_minus1", i); // overflow at dimension_id_len
}
```

# Version info

```
MP4Box - GPAC version 2.1-DEV-rev574-g9d5bb184b-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: --enable-sanitizer
Features: GPAC_CONFIG_LINUX GPAC_64_BITS GPAC_HAS_IPV6 GPAC_HAS_SSL GPAC_HAS_SOCK_UN GPAC_MINIMAL_ODF GPAC_HAS_QJS GPAC_HAS_LINUX_DVB  GPAC_DISABLE_3D
```

# Reproduce

compile and run

```
./configure --enable-sanitizer
make
./MP4Box import -add poc_bof6.mp4
```

Crash reported by sanitizer

```
[Core] exp-golomb read failed, not enough bits in bitstream !
[HEVC] Warning: Error parsing NAL unit
media_tools/av_parsers.c:7633:19: runtime error: index 16 out of bounds for type 'u8 [16]'
```

# POC

[poc_bof6.zip](https://github.com/gpac/gpac/files/10202354/poc_bof6.zip)


# Impact

Potentially causing DoS and RCE

# Credit 

Xdchase
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