CVE-2021-45760: Invalid memory address dereference in dump_od_to_saf.isra() · Issue #1966 · gpac/gpac

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An invalid memory address dereference was discovered in dump_od_to_saf.isra(). 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:

poc_3.zip

Result

[ODF] Not enough bytes (38) to read descriptor (size=59)
[ODF] Error reading descriptor (tag 4 size 49): Invalid MPEG-4 Descriptor
[iso file] extra box maxr found in hinf, deleting
[iso file] extra box maxr found in hinf, deleting
[iso file] Incomplete box mdat - start 11495 size 861263
[iso file] Incomplete file while reading for dump - aborting parsing
[ODF] Not enough bytes (38) to read descriptor (size=59)
[ODF] Error reading descriptor (tag 4 size 49): Invalid MPEG-4 Descriptor
[iso file] extra box maxr found in hinf, deleting
[iso file] extra box maxr found in hinf, deleting
[iso file] Incomplete box mdat - start 11495 size 861263
[iso file] Incomplete file while reading for dump - aborting parsing
MPEG-4 BIFS Scene Parsing
Scene loaded - dumping 2 systems streams
[1]    1390552 segmentation fault  ./MP4Box -lsr ./poc/poc_3

gdb

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7ab7e3b in dump_od_to_saf.isra () from /root/fuckit/test/gpac1210/bin/gcc/libgpac.so.10
LEGEND: STACK | HEAP | CODE | DATA | RWX | RODATA
────────────────────────────────────────────[ REGISTERS ]─────────────────────────────────────────────
 RAX  0x0
 RBX  0x5555555df630 —▸ 0x5555555df601 ◂— 0x2100000000000000
 RCX  0x0
 RDX  0x7ffff72bf040 ◂— 0x7ffff72bf040
 RDI  0x5555555e0400 ◂— 0xfbad2c84
 RSI  0x5555555df440 ◂— 0x7
 R8   0x0
 R9   0x23
 R10  0x7ffff7e4690b ◂— 0x7473200000000022 /* '"' */
 R11  0x7fffffff70c7 ◂— 0x4d0552ab398a0031 /* '1' */
 R12  0x0
 R13  0x5555555df4d0 ◂— 0x0
 R14  0x5555555df070 —▸ 0x5555555e0400 ◂— 0xfbad2c84
 R15  0x5555555dfcb0 ◂— 0x700010003
 RBP  0x1
 RSP  0x7fffffff7200 —▸ 0x5555555df8a0 ◂— 0xc0
 RIP  0x7ffff7ab7e3b (dump_od_to_saf.isra+299) ◂— movzx  edx, byte ptr [rax + 8]
──────────────────────────────────────────────[ DISASM ]──────────────────────────────────────────────
 ► 0x7ffff7ab7e3b <dump_od_to_saf.isra+299>    movzx  edx, byte ptr [rax + 8]
   0x7ffff7ab7e3f <dump_od_to_saf.isra+303>    mov    ecx, dword ptr [rax + 4]
   0x7ffff7ab7e42 <dump_od_to_saf.isra+306>    xor    eax, eax
   0x7ffff7ab7e44 <dump_od_to_saf.isra+308>    mov    r8d, dword ptr [rsi + 0x18]
   0x7ffff7ab7e48 <dump_od_to_saf.isra+312>    lea    rsi, [rip + 0x38eac1]
   0x7ffff7ab7e4f <dump_od_to_saf.isra+319>    call   gf_fprintf@plt                <gf_fprintf@plt>

   0x7ffff7ab7e54 <dump_od_to_saf.isra+324>    mov    rdx, qword ptr [r13]
   0x7ffff7ab7e58 <dump_od_to_saf.isra+328>    mov    r9, qword ptr [rsp]
   0x7ffff7ab7e5c <dump_od_to_saf.isra+332>    test   rdx, rdx
   0x7ffff7ab7e5f <dump_od_to_saf.isra+335>    jne    dump_od_to_saf.isra+464                <dump_od_to_saf.isra+464>

   0x7ffff7ab7e61 <dump_od_to_saf.isra+337>    mov    rdi, qword ptr [r14]
──────────────────────────────────────────────[ STACK ]───────────────────────────────────────────────
00:0000│ rsp 0x7fffffff7200 —▸ 0x5555555df8a0 ◂— 0xc0
01:0008│     0x7fffffff7208 ◂— 0x100000002
02:0010│     0x7fffffff7210 —▸ 0x5555555dfa50 —▸ 0x5555555dfde0 ◂— 0x0
03:0018│     0x7fffffff7218 ◂— 0x0
04:0020│     0x7fffffff7220 —▸ 0x5555555dfa50 —▸ 0x5555555dfde0 ◂— 0x0
05:0028│     0x7fffffff7228 ◂— 0x0
06:0030│     0x7fffffff7230 ◂— 0x0
07:0038│     0x7fffffff7238 —▸ 0x5555555df4d0 ◂— 0x0
────────────────────────────────────────────[ BACKTRACE ]─────────────────────────────────────────────
 ► f 0   0x7ffff7ab7e3b dump_od_to_saf.isra+299
   f 1   0x7ffff7ac282d gf_sm_dump+1853
   f 2   0x555555584418 dump_isom_scene+616
   f 3   0x55555557b42c mp4boxMain+9228
   f 4   0x7ffff75630b3 __libc_start_main+243
──────────────────────────────────────────────────────────────────────────────────────────────────────
pwndbg> bt
#0  0x00007ffff7ab7e3b in dump_od_to_saf.isra () from /root/fuckit/test/gpac1210/bin/gcc/libgpac.so.10
#1  0x00007ffff7ac282d in gf_sm_dump () from /root/fuckit/test/gpac1210/bin/gcc/libgpac.so.10
#2  0x0000555555584418 in dump_isom_scene ()
#3  0x000055555557b42c in mp4boxMain ()
#4  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
#5  0x000055555556c45e in _start ()