Headline

CVE-2021-44918: Null Pointer Dereference in gf_node_get_field() · Issue #1968 · gpac/gpac

A Null Pointer Dereference vulnerability exists in gpac 1.1.0 in the gf_node_get_field function, which can cause a segmentation fault and application crash.

2 years ago

CVE

Open in Source

#vulnerability #ubuntu #linux #js #git

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I looked for a similar issue and couldn’t find any.
I tried with the latest version of GPAC. Installers available at http://gpac.io/downloads/gpac-nightly-builds/
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/

A null pointer dereference was discovered in gf_node_get_field(). The vulnerability causes a segmentation fault and application crash.

Version:

MP4Box - GPAC version 1.1.0-DEV-revUNKNOWN_REV
(c) 2000-2021 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_JPEG GPAC_HAS_PNG GPAC_HAS_LINUX_DVB  GPAC_DISABLE_3D

System information
Ubuntu 20.04 focal, AMD EPYC 7742 64-Core @ 16x 2.25GHz

command:

./MP4Box -lsr poc_5
./MP4Box -lsr poc_6

poc.zip

Result

poc_5

[iso file] Unknown box type dreFF in parent dinf
[iso file] Missing dref box in dinf
[iso file] extra box maxr found in hinf, deleting
[iso file] Unknown box type FFFFFF80 in parent hinf
[iso file] extra box maxr found in hinf, deleting
[iso file] Unknown box type 80rak in parent moov
[iso file] Incomplete box mdat - start 11495 size 860062
[iso file] Incomplete file while reading for dump - aborting parsing
[iso file] Unknown box type dreFF in parent dinf
[iso file] Missing dref box in dinf
[iso file] extra box maxr found in hinf, deleting
[iso file] Unknown box type FFFFFF80 in parent hinf
[iso file] extra box maxr found in hinf, deleting
[iso file] Unknown box type 80rak in parent moov
[iso file] Incomplete box mdat - start 11495 size 860062
[iso file] Incomplete file while reading for dump - aborting parsing
MPEG-4 LASeR Scene Parsing
[1]    878696 segmentation fault  ./MP4Box -lsr ./poc/poc_5

poc_6

[iso file] extra box maxr found in hinf, deleting
[iso file] extra box maxr found in hinf, deleting
[iso file] Unknown box type pm00x in parent hinf
[iso file] Unknown box type 80rak in parent moov
[iso file] Incomplete box mdat - start 11495 size 861258
[iso file] Incomplete file while reading for dump - aborting parsing
[iso file] extra box maxr found in hinf, deleting
[iso file] extra box maxr found in hinf, deleting
[iso file] Unknown box type pm00x in parent hinf
[iso file] Unknown box type 80rak in parent moov
[iso file] Incomplete box mdat - start 11495 size 861258
[iso file] Incomplete file while reading for dump - aborting parsing
MPEG-4 LASeR Scene Parsing
[LASeR] memory overread - corrupted decoding
[LASeR] memory overread - corrupted decoding
[LASeR] memory overread - corrupted decoding
[LASeR] memory overread - corrupted decoding
[LASeR] memory overread - corrupted decoding
[LASeR] memory overread - corrupted decoding
[LASeR] memory overread - corrupted decoding
[LASeR] memory overread - corrupted decoding
[LASeR] memory overread - corrupted decoding
...
Program received signal SIGSEGV, Segmentation fault.

gdb

poc_5

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff784acf0 in gf_node_get_field () from /root/fuckit/test/gpac1210/bin/gcc/libgpac.so.10
LEGEND: STACK | HEAP | CODE | DATA | RWX | RODATA
────────────────────────────────────────────[ REGISTERS ]─────────────────────────────────────────────
 RAX  0x4
 RBX  0x5555555df130 —▸ 0x5555555d4330 ◂— 0x0
 RCX  0x5555555df310 ◂— 0x0
 RDX  0x7fffffff7050 ◂— 0x4
 RDI  0x0
 RSI  0x7fffffff7050 ◂— 0x4
 R8   0x4
 R9   0x0
 R10  0x7ffff775bb48 ◂— 'gf_node_get_field'
 R11  0x7ffff784acd0 (gf_node_get_field) ◂— endbr64
 R12  0xfffffffe
 R13  0x5555555df290 ◂— 0x4
 R14  0x7fffffff7050 ◂— 0x4
 R15  0x5555555dcdc0 —▸ 0x5555555d26b0 ◂— 0x0
 RBP  0x80
 RSP  0x7fffffff6fa8 —▸ 0x7ffff7b5784a (lsr_read_command_list+1402) ◂— mov    eax, dword ptr [rsp + 0xa4]
 RIP  0x7ffff784acf0 (gf_node_get_field+32) ◂— mov    rax, qword ptr [rdi]
──────────────────────────────────────────────[ DISASM ]──────────────────────────────────────────────
 ► 0x7ffff784acf0 <gf_node_get_field+32>     mov    rax, qword ptr [rdi]
   0x7ffff784acf3 <gf_node_get_field+35>     movzx  eax, word ptr [rax]
   0x7ffff784acf6 <gf_node_get_field+38>     test   ax, ax
   0x7ffff784acf9 <gf_node_get_field+41>     je     gf_node_get_field+144                <gf_node_get_field+144>
    ↓
   0x7ffff784ad60 <gf_node_get_field+144>    mov    eax, 0xffffffff
   0x7ffff784ad65 <gf_node_get_field+149>    ret

   0x7ffff784ad66                            nop    word ptr cs:[rax + rax]
   0x7ffff784ad70 <dirty_children>           push   r14
   0x7ffff784ad72 <dirty_children+2>         push   r13
   0x7ffff784ad74 <dirty_children+4>         push   r12
   0x7ffff784ad76 <dirty_children+6>         push   rbp
──────────────────────────────────────────────[ STACK ]───────────────────────────────────────────────
00:0000│ rsp 0x7fffffff6fa8 —▸ 0x7ffff7b5784a (lsr_read_command_list+1402) ◂— mov    eax, dword ptr [rsp + 0xa4]
01:0008│     0x7fffffff6fb0 ◂— 0x0
02:0010│     0x7fffffff6fb8 ◂— 0x300000000
03:0018│     0x7fffffff6fc0 ◂— 0x0
04:0020│     0x7fffffff6fc8 —▸ 0x5555555df0b0 —▸ 0x5555555df1d0 —▸ 0x5555555df130 —▸ 0x5555555d4330 ◂— ...
05:0028│     0x7fffffff6fd0 ◂— 0x0
... ↓        2 skipped
────────────────────────────────────────────[ BACKTRACE ]─────────────────────────────────────────────
 ► f 0   0x7ffff784acf0 gf_node_get_field+32
   f 1   0x7ffff7b5784a lsr_read_command_list+1402
   f 2   0x7ffff7b59914 lsr_decode_laser_unit+708
   f 3   0x7ffff7b6204d gf_laser_decode_command_list+333
   f 4   0x7ffff7aa1eb1 gf_sm_load_run_isom+1505
   f 5   0x5555555844a8 dump_isom_scene+760
   f 6   0x55555557b42c mp4boxMain+9228
   f 7   0x7ffff75630b3 __libc_start_main+243
──────────────────────────────────────────────────────────────────────────────────────────────────────
pwndbg> bt
#0  0x00007ffff784acf0 in gf_node_get_field () from /root/fuckit/test/gpac1210/bin/gcc/libgpac.so.10
#1  0x00007ffff7b5784a in lsr_read_command_list () from /root/fuckit/test/gpac1210/bin/gcc/libgpac.so.10
#2  0x00007ffff7b59914 in lsr_decode_laser_unit () from /root/fuckit/test/gpac1210/bin/gcc/libgpac.so.10
#3  0x00007ffff7b6204d in gf_laser_decode_command_list () from /root/fuckit/test/gpac1210/bin/gcc/libgpac.so.10
#4  0x00007ffff7aa1eb1 in gf_sm_load_run_isom () from /root/fuckit/test/gpac1210/bin/gcc/libgpac.so.10
#5  0x00005555555844a8 in dump_isom_scene ()
#6  0x000055555557b42c in mp4boxMain ()
#7  0x00007ffff75630b3 in __libc_start_main (main=0x55555556c420 <main>, argc=3, argv=0x7fffffffe188, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe178) at ../csu/libc-start.c:308
#8  0x000055555556c45e in _start ()

poc_6

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff784acf0 in gf_node_get_field () from /root/fuckit/test/gpac1210/bin/gcc/libgpac.so.10
LEGEND: STACK | HEAP | CODE | DATA | RWX | RODATA
────────────────────────────────────────────[ REGISTERS ]─────────────────────────────────────────────
 RAX  0xbb
 RBX  0x5555555df0f0 —▸ 0x5555555d4300 ◂— 0x0
 RCX  0x5555555df2d0 ◂— 0x0
 RDX  0x7fffffff7000 ◂— 0xbb
 RDI  0x0
 RSI  0x7fffffff7000 ◂— 0xbb
 R8   0xbb
 R9   0x0
 R10  0x7ffff775bb48 ◂— 'gf_node_get_field'
 R11  0x7ffff784acd0 (gf_node_get_field) ◂— endbr64
 R12  0xfffffffe
 R13  0x5555555df250 ◂— 0xbb
 R14  0x7fffffff7000 ◂— 0xbb
 R15  0x5555555dcd80 —▸ 0x5555555d2680 ◂— 0x0
 RBP  0x40
 RSP  0x7fffffff6f58 —▸ 0x7ffff7b5784a (lsr_read_command_list+1402) ◂— mov    eax, dword ptr [rsp + 0xa4]
 RIP  0x7ffff784acf0 (gf_node_get_field+32) ◂— mov    rax, qword ptr [rdi]
──────────────────────────────────────────────[ DISASM ]──────────────────────────────────────────────
 ► 0x7ffff784acf0 <gf_node_get_field+32>     mov    rax, qword ptr [rdi]
   0x7ffff784acf3 <gf_node_get_field+35>     movzx  eax, word ptr [rax]
   0x7ffff784acf6 <gf_node_get_field+38>     test   ax, ax
   0x7ffff784acf9 <gf_node_get_field+41>     je     gf_node_get_field+144                <gf_node_get_field+144>
    ↓
   0x7ffff784ad60 <gf_node_get_field+144>    mov    eax, 0xffffffff
   0x7ffff784ad65 <gf_node_get_field+149>    ret

   0x7ffff784ad66                            nop    word ptr cs:[rax + rax]
   0x7ffff784ad70 <dirty_children>           push   r14
   0x7ffff784ad72 <dirty_children+2>         push   r13
   0x7ffff784ad74 <dirty_children+4>         push   r12
   0x7ffff784ad76 <dirty_children+6>         push   rbp
──────────────────────────────────────────────[ STACK ]───────────────────────────────────────────────
00:0000│ rsp 0x7fffffff6f58 —▸ 0x7ffff7b5784a (lsr_read_command_list+1402) ◂— mov    eax, dword ptr [rsp + 0xa4]
01:0008│     0x7fffffff6f60 ◂— 0x6469005453414c00
02:0010│     0x7fffffff6f68 ◂— 0x900000000
03:0018│     0x7fffffff6f70 ◂— 0x0
04:0020│     0x7fffffff6f78 —▸ 0x5555555df070 —▸ 0x5555555df190 —▸ 0x5555555df0f0 —▸ 0x5555555d4300 ◂— ...
05:0028│     0x7fffffff6f80 ◂— 0x0
... ↓        2 skipped
────────────────────────────────────────────[ BACKTRACE ]─────────────────────────────────────────────
 ► f 0   0x7ffff784acf0 gf_node_get_field+32
   f 1   0x7ffff7b5784a lsr_read_command_list+1402
   f 2   0x7ffff7b59914 lsr_decode_laser_unit+708
   f 3   0x7ffff7b6204d gf_laser_decode_command_list+333
   f 4   0x7ffff7aa1eb1 gf_sm_load_run_isom+1505
   f 5   0x5555555844a8 dump_isom_scene+760
   f 6   0x55555557b42c mp4boxMain+9228
   f 7   0x7ffff75630b3 __libc_start_main+243
──────────────────────────────────────────────────────────────────────────────────────────────────────
pwndbg> bt
#0  0x00007ffff784acf0 in gf_node_get_field () from /root/fuckit/test/gpac1210/bin/gcc/libgpac.so.10
#1  0x00007ffff7b5784a in lsr_read_command_list () from /root/fuckit/test/gpac1210/bin/gcc/libgpac.so.10
#2  0x00007ffff7b59914 in lsr_decode_laser_unit () from /root/fuckit/test/gpac1210/bin/gcc/libgpac.so.10
#3  0x00007ffff7b6204d in gf_laser_decode_command_list () from /root/fuckit/test/gpac1210/bin/gcc/libgpac.so.10
#4  0x00007ffff7aa1eb1 in gf_sm_load_run_isom () from /root/fuckit/test/gpac1210/bin/gcc/libgpac.so.10
#5  0x00005555555844a8 in dump_isom_scene ()
#6  0x000055555557b42c in mp4boxMain ()
#7  0x00007ffff75630b3 in __libc_start_main (main=0x55555556c420 <main>, argc=3, argv=0x7fffffffe138, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe128) at ../csu/libc-start.c:308
#8  0x000055555556c45e in _start ()

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