#43 Heap Out-Of-Bounds Memory Access (122036054)

[Google-Autofuzz]

Hello InChI team,

As part of our fuzzing efforts at Google, we have identified an issue affecting
InChI (tested with revision v1.04, September 2011).

To reproduce, we are attaching a Dockerfile which compiles the project with
LLVM, taking advantage of the sanitizers that it offers. More information about
how to use the attached Dockerfile can be found here:
https://docs.docker.com/engine/reference/builder/

Instructions:
unzip artifacts_122036054.zip
docker build --build-arg SANITIZER=address --tag=autofuzz-InChI-122036054 autofuzz_122036054
docker run --entrypoint /fuzzing/repro.sh --cap-add=SYS_PTRACE -v $PWD/autofuzz_122036054/poc-82f7ef26182fdbf44a21f3412c8f1dad4a2082c5a5cde3442dae30a32995eef8_min:/tmp/poc autofuzz-InChI-122036054 "" /tmp/poc
docker run --cap-add=SYS_PTRACE -v $PWD/autofuzz_122036054/poc-82f7ef26182fdbf44a21f3412c8f1dad4a2082c5a5cde3442dae30a32995eef8_min:/tmp/poc -it autofuzz-InChI-122036054

Alternatively, and depending on the bug, you could use gcc, valgrind or other
instrumentation tools to aid in the investigation. The sanitizer error that we
encountered is here:

INFO: Seed: 4180114908
INFO: Loaded 0 modules (0 guards): 
/fuzzing/fuzzer: Running 1 inputs 500 time(s) each.
Running: /tmp/poc-82f7ef26182fdbf44a21f3412c8f1dad4a2082c5a5cde3442dae30a32995eef8
=================================================================
==6==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60f0000000f0 at pc 0x0000004c7058 bp 0x7ffe5e1e2a70 sp 0x7ffe5e1e2220
WRITE of size 352 at 0x60f0000000f0 thread T0
    #0 0x4c7057 in __asan_memcpy (/fuzzing/fuzzer+0x4c7057)
    #1 0x703e1e in RestoreAtomConnectionsSetStereo /fuzzing/INCHI-1-API/INCHI_API/inchi_dll/ichirvr2.c:336:13
    #2 0x6cfc97 in OneInChI2Atom /fuzzing/INCHI-1-API/INCHI_API/inchi_dll/ichirvr4.c:2827:11
    #3 0x67e7fc in InChI2Atom /fuzzing/INCHI-1-API/INCHI_API/inchi_dll/ichirvr7.c:131:11
    #4 0x681407 in AllInchiToStructure /fuzzing/INCHI-1-API/INCHI_API/inchi_dll/ichirvr7.c:787:23
    #5 0x659c40 in ReadWriteInChI /fuzzing/INCHI-1-API/INCHI_API/inchi_dll/ichiread.c:929:23
    #6 0x543f6e in GetStructFromINCHI /fuzzing/INCHI-1-API/INCHI_API/inchi_dll/inchi_dll.c:2293:16
    #7 0x518759 in LLVMFuzzerTestOneInput /fuzzing/security-research-pocs/autofuzz/inchi_fuzzer.cc:27:3
    #8 0x523ede in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) (/fuzzing/fuzzer+0x523ede)
    #9 0x51903e in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) (/fuzzing/fuzzer+0x51903e)
    #10 0x51d547 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) (/fuzzing/fuzzer+0x51d547)
    #11 0x518d5b in main (/fuzzing/fuzzer+0x518d5b)
    #12 0x7fadd68c92e0 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x202e0)
    #13 0x41ff89 in _start (/fuzzing/fuzzer+0x41ff89)

0x60f0000000f0 is located 0 bytes to the right of 176-byte region [0x60f000000040,0x60f0000000f0)
allocated by thread T0 here:
    #0 0x4de320 in calloc (/fuzzing/fuzzer+0x4de320)
    #1 0x703dc8 in RestoreAtomConnectionsSetStereo /fuzzing/INCHI-1-API/INCHI_API/inchi_dll/ichirvr2.c:330:41
    #2 0x6cfc97 in OneInChI2Atom /fuzzing/INCHI-1-API/INCHI_API/inchi_dll/ichirvr4.c:2827:11
    #3 0x67e7fc in InChI2Atom /fuzzing/INCHI-1-API/INCHI_API/inchi_dll/ichirvr7.c:131:11
    #4 0x681407 in AllInchiToStructure /fuzzing/INCHI-1-API/INCHI_API/inchi_dll/ichirvr7.c:787:23
    #5 0x659c40 in ReadWriteInChI /fuzzing/INCHI-1-API/INCHI_API/inchi_dll/ichiread.c:929:23
    #6 0x543f6e in GetStructFromINCHI /fuzzing/INCHI-1-API/INCHI_API/inchi_dll/inchi_dll.c:2293:16
    #7 0x518759 in LLVMFuzzerTestOneInput /fuzzing/security-research-pocs/autofuzz/inchi_fuzzer.cc:27:3
    #8 0x523ede in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) (/fuzzing/fuzzer+0x523ede)

SUMMARY: AddressSanitizer: heap-buffer-overflow (/fuzzing/fuzzer+0x4c7057) in __asan_memcpy
Shadow bytes around the buggy address:
  0x0c1e7fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c1e7fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c1e7fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c1e7fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c1e7fff8000: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
=>0x0c1e7fff8010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00[fa]fa
  0x0c1e7fff8020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1e7fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1e7fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1e7fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1e7fff8060: 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
==6==ABORTING

We will gladly work with you so you can successfully confirm and reproduce this
issue. Do let us know if you have any feedback surrounding the documentation.

Once you have reproduced the issue, we'd appreciate to learn your expected
timeline for an update to be released. With any fix, please attribute the report
to "Google Autofuzz project".

We are also pleased to inform you that your project is eligible for inclusion to
the OSS-Fuzz project, which can provide additional continuous fuzzing, and
encourage you to investigate integration options.

Don't hesitate to let us know if you have any questions!

Google AutoFuzz Team