#10686: heap-buffer-overflow at libavfilter/asrc_afirsrc.c:495:30 in
config_eq_output in FFmpeg
-------------------------------------+-------------------------------------
Reporter: | Type: defect
ZengYunxiang |
Status: new | Priority: critical
Component: avfilter | Version: git-
| master
Keywords: bugs | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
Dear developers, hello!
I recently proposed a new fuzzing method named fuzzyx, and found the
following heap-buffer-overflow bug on FFmpeg6.1, please confirm.
POC file link:
poc1ffmpeg:
[https://github.com/Frank-Z7/z-vulnerabilitys/blob/main/poc1ffmpeg]
How to reproduce:
{{{
Reproduction：
git clone https://github.com/FFmpeg/FFmpeg.git ffmpeg6-1
cd ffmpeg6-1
git checkout 466799d
./configure --cc=clang --cxx=clang++ --ld=clang --enable-debug --toolchain
=clang-asan
make -j30
./ffmpeg_g -y -i poc1ffmpeg -filter_complex afireqsrc tmp.mp4
}}}
ASAN Log:
{{{
=================================================================
==444674==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x60a000000580 at pc 0x00000054dfe7 bp 0x7fffffff6ad0 sp 0x7fffffff6ac8
WRITE of size 4 at 0x60a000000580 thread T0
#0 0x54dfe6 in config_eq_output
/ffmpeg6-1/libavfilter/asrc_afirsrc.c:495:30
#1 0x5d5cd9 in avfilter_config_links
/ffmpeg6-1/libavfilter/avfilter.c:340:31
#2 0x5d5c91 in avfilter_config_links
/ffmpeg6-1/libavfilter/avfilter.c:329:24
#3 0x5d5c91 in avfilter_config_links
/ffmpeg6-1/libavfilter/avfilter.c:329:24
#4 0x5e44d6 in graph_config_links
/ffmpeg6-1/libavfilter/avfiltergraph.c:254:24
#5 0x5e44d6 in avfilter_graph_config
/ffmpeg6-1/libavfilter/avfiltergraph.c:1177:16
#6 0x4ea9bd in configure_filtergraph
/ffmpeg6-1/fftools/ffmpeg_filter.c:1681:16
#7 0x4e5e0b in ofilter_bind_ost
/ffmpeg6-1/fftools/ffmpeg_filter.c:763:15
#8 0x512b21 in ost_add /ffmpeg6-1/fftools/ffmpeg_mux_init.c:1428:19
#9 0x4fd744 in create_streams
/ffmpeg6-1/fftools/ffmpeg_mux_init.c:1809:19
#10 0x4fd744 in of_open /ffmpeg6-1/fftools/ffmpeg_mux_init.c:2695:11
#11 0x51828d in open_files /ffmpeg6-1/fftools/ffmpeg_opt.c:1286:15
#12 0x51828d in ffmpeg_parse_options
/ffmpeg6-1/fftools/ffmpeg_opt.c:1340:11
#13 0x533747 in main /ffmpeg6-1/fftools/ffmpeg.c:1312:11
#14 0x7ffff7c0d082 in __libc_start_main (/lib/x86_64-linux-
gnu/libc.so.6+0x24082)
#15 0x420b4d in _start (/ffmpeg6-1/ffmpeg_g+0x420b4d)
0x60a000000580 is located 0 bytes to the right of 64-byte region
[0x60a000000540,0x60a000000580)
allocated by thread T0 here:
#0 0x4994e7 in posix_memalign /local/mnt/workspace/bcain_clang_bcain-
ubuntu_23113/llvm/utils/release/final/llvm.src/projects/compiler-
rt/lib/asan/asan_malloc_linux.cc:226:3
#1 0x3c7bdf6 in av_malloc /ffmpeg6-1/libavutil/mem.c:105:9
#2 0x3c7bdf6 in av_mallocz /ffmpeg6-1/libavutil/mem.c:256:17
#3 0x3c7bdf6 in av_calloc /ffmpeg6-1/libavutil/mem.c:267:12
#4 0x54cb75 in config_eq_output
/ffmpeg6-1/libavfilter/asrc_afirsrc.c:483:24
#5 0x5d5cd9 in avfilter_config_links
/ffmpeg6-1/libavfilter/avfilter.c:340:31
SUMMARY: AddressSanitizer: heap-buffer-overflow
/ffmpeg6-1/libavfilter/asrc_afirsrc.c:495:30 in config_eq_output
Shadow bytes around the buggy address:
0x0c147fff8060: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
0x0c147fff8070: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c147fff8080: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa
0x0c147fff8090: 00 00 00 00 00 00 00 fa fa fa fa fa fa fa fa fa
0x0c147fff80a0: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
=>0x0c147fff80b0:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c147fff80c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c147fff80d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c147fff80e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c147fff80f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c147fff8100: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 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
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
==444674==ABORTING
}}}
ffmpeg version:
{{{
ffmpeg version n6.1-3-g466799d4f5 Copyright (c) 2000-2023 the FFmpeg
developers
built with clang version 9.0.0 (https://github.com/llvm-mirror/llvm
c62b24f070c9a4bb1a76409e623042a740cac4cd)
configuration: --cc=clang --cxx=clang++ --ld=clang --enable-debug
--toolchain=clang-asan
libavutil 58. 29.100 / 58. 29.100
libavcodec 60. 31.102 / 60. 31.102
libavformat 60. 16.100 / 60. 16.100
libavdevice 60. 3.100 / 60. 3.100
libavfilter 9. 12.100 / 9. 12.100
libswscale 7. 5.100 / 7. 5.100
libswresample 4. 12.100 / 4. 12.100
}}}
Credit:
{{{
Zeng Yunxiang , HUST
Song Jiaxuan , HUST
}}}
Thanks for your time!
--
Ticket URL: <https://trac.ffmpeg.org/ticket/10686>
FFmpeg <https://ffmpeg.org>
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