Project: faad2 (knik0/faad2), language: c++
Vulnerability instance: faad2.cve-2021-32277
Sanitizer: address

================= Bug Report (1/1) ==================
## Source: GitHub Issue
## URL: https://github.com/knik0/faad2/issues/59
## Description:
Issue: knik0/faad2#59
Title: A heap-buffer-overflow in sbr_qmf.c:96:77
State: closed
Created by: seviezhou
Created at: 2020-08-30 15:32:46+00:00

Issue Body:
## System info

Ubuntu x86_64, clang 6.0, faad (latest master [1073ae](https://github.com/knik0/faad2/commit/1073aeef823cafd844704389e9a497c257768e2f))

## Configure

CFLAGS="-g -fsanitize=address" LDFLAGS="-fsanitize=address" ./configure --enable-shared=no

## Command line

./frontend/faad -w -b 5 @@

## AddressSanitizer output

```
NULL	349.611 secs, 7 ch, 24000 Hz

=================================================================
==73167==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x620000004f80 at pc 0x0000005df054 bp 0x7fffad795310 sp 0x7fffad795308
READ of size 4 at 0x620000004f80 thread T0
    #0 0x5df053 in sbr_qmf_analysis_32 /home/seviezhou/faad2/libfaad/sbr_qmf.c:96:77
    #1 0x598dc5 in sbr_process_channel /home/seviezhou/faad2/libfaad/sbr_dec.c
    #2 0x59addc in sbrDecodeSingleFrame /home/seviezhou/faad2/libfaad/sbr_dec.c:562:17
    #3 0x5c2f81 in reconstruct_single_channel /home/seviezhou/faad2/libfaad/specrec.c:1070:22
    #4 0x556c2e in single_lfe_channel_element /home/seviezhou/faad2/libfaad/syntax.c:643:14
    #5 0x556c2e in decode_sce_lfe /home/seviezhou/faad2/libfaad/syntax.c:357
    #6 0x555c2b in raw_data_block /home/seviezhou/faad2/libfaad/syntax.c:565:13
    #7 0x5389de in aac_frame_decode /home/seviezhou/faad2/libfaad/decoder.c:990:9
    #8 0x52f738 in decodeMP4file /home/seviezhou/faad2/frontend/main.c:916:25
    #9 0x52f738 in faad_main /home/seviezhou/faad2/frontend/main.c:1323
    #10 0x7f2790ec683f in __libc_start_main /build/glibc-e6zv40/glibc-2.23/csu/../csu/libc-start.c:291
    #11 0x41a698 in _start (/home/seviezhou/faad2/frontend/faad+0x41a698)

0x620000004f80 is located 0 bytes to the right of 3840-byte region [0x620000004080,0x620000004f80)
allocated by thread T0 here:
    #0 0x4de8a8 in __interceptor_malloc /home/seviezhou/llvm-6.0.0/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:88
    #1 0x5c1a0b in allocate_single_channel /home/seviezhou/faad2/libfaad/specrec.c:736:48
    #2 0x5c1a0b in reconstruct_single_channel /home/seviezhou/faad2/libfaad/specrec.c:934
    #3 0x556c2e in single_lfe_channel_element /home/seviezhou/faad2/libfaad/syntax.c:643:14
    #4 0x556c2e in decode_sce_lfe /home/seviezhou/faad2/libfaad/syntax.c:357
    #5 0x555c2b in raw_data_block /home/seviezhou/faad2/libfaad/syntax.c:565:13

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/seviezhou/faad2/libfaad/sbr_qmf.c:96:77 in sbr_qmf_analysis_32
Shadow bytes around the buggy address:
  0x0c407fff89a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c407fff89b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c407fff89c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c407fff89d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c407fff89e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c407fff89f0:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c407fff8a00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c407fff8a10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c407fff8a20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c407fff8a30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c407fff8a40: 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
==73167==ABORTING
```

## POC

[sbr_qmf_analysis_32-sbr_qmf-96.zip](https://github.com/knik0/faad2/files/5147035/sbr_qmf_analysis_32-sbr_qmf-96.zip)



Attachments:
https://github.com/knik0/faad2/files/5147035/sbr_qmf_analysis_32-sbr_qmf-96.zip

Commit References:
1073aeef823cafd844704389e9a497c257768e2f

Build script:
#!/bin/bash -eu
# Minimized build script with only core build commands
set -eu
./bootstrap
./configure
make -j$(nproc)

Dockerfile:
FROM hwiwonlee/secb.base:latest
RUN apt-get update && apt-get install -y make autoconf automake libtool
RUN git clone https://github.com/knik0/faad2 faad2
RUN git -C faad2 checkout f97f6e933a4ee3cf00b4e1ba4e3a1f05bc9de165
WORKDIR $SRC/faad2
COPY build.sh $SRC/

Additional files: