/fpicker-aflpp-android

Fpicker with AFL++ on Android (device or emulator)

Primary LanguageC

fpicker-aflpp-android

aflplusplus-fpicker

In the past used it to refind Stagefright bug CVE 2020-0411 within hours (several months after being 0 day)

Tested 29/11/2022 on Android 12 x86_64 (think x86) in emulator (docker) on x86_64 host

You can run this on Device or Emulator (x86, x86_64 or arm, aarch64)

With docker there are some space issues, on Android Emulator from Android Studio you can eaisly resize

WARNING: You can adjust all the paths other than /data/local/tmp/re.frida.server and /mnt/scratch/libandroid-shmem.so (otherwise you need to modify components)

INFO Initially used it with Frida 14, but it also works with latest Frida 16. Please use latest Frida version

Install NDK

make toolchain ie under $HOME/x86_64

 ./make_standalone_toolchain.py --arch x86_64 --install-dir ~/x86_64
 
export CC=$HOME/x86_64/bin/x86_64-linux-android31-clang

SHMEM

make 

make libandroid-shmem.so

Fpicker (modified)

copy devkit to libfrida-core-linux.a

make fpicker-linux

Socket

Already precompiled (adjust Makefile when need to compile)

AFL++ for Android AOSP (modified for fpicker)

After AOSP compilation we should copy afl++ to the working directory (root of AOSP)

Now that we are at the right version, we need to extract frida-gum (https://github.com/frida/frida/releases/download/15.1.4/frida-gum-devkit-15.1.4-android-x86_64.tar.xz or arm) to the utils/afl_frida/android/ directory.

.
├── arm
│   ├── frida-gum-example.c
│   ├── frida-gum.h
│   └── libfrida-gum.a
├── frida-gum-example.c
├── frida-gum.h
├── libfrida-gum.a
├── README.md
└── x86
    ├── frida-gum-example.c
    ├── frida-gum.h
    └── libfrida-gum.a

2 directories, 10 files

libfrida-gum.a and frida-gum.h is the same as in x86 (compiling here for x86_64)

All that’s left for us to do is build AFL++ from the working directory with the following command:

mmm afl++

Docker Android 12 Device

On Pc

docker run   --privileged -d -p 6080:6080 -p 5554:5554 -p 5555:5555 -e DEVICE="Samsung Galaxy S6"  budtmo/docker-android-x86-12.0

adb root
adb disable verity
adb remount
adb reboot

Copy

adb push libandroid-shmem.so /mnt/scratch

adb push support-sock-x86_64 /data/local/tmp

On device

cd /data/local/tmp
chmod a+x support-sock-x86_64
./support-sock-x86_64

On Pc

adb push $HOME/fuzzer-fpicker/afl++x86_64/system/bin/afl-fuzz /mnt/scratch
adb push $HOME/fuzzer-fpicker/afl++x86_64/system/lib64 /mnt/scratch


adb push fpicker-x86_64/examples/test /mnt/scratch
adb push fpicker-x86_64/harness/ /mnt/scratch

adb push frida-server-14.2.18-android-x86_64 /mnt/scratch

Start frida

chmod a+x frida-server-14.2.18-android-x86_64
./frida-server-14.2.18-android-x86_64

cp libandroid-shmem.so /data/local/tmp/re.frida.server/ (Important, keep that paths as they are)

Start test program

test/test

Copy fpicker

Start fuzzing

mkdir in 
echo "AAA" > in/1
mkdir out

chmod a+x afl-fuzz
chmod a+x fpicker

cd /sys/devices/system/cpu
echo performance | tee cpu*/cpufreq/scaling_governor

LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/mnt/scratch/lib64 AFL_SKIP_BIN_CHECK=1 LD_PRELOAD=/mnt/scratch/libandroid-shmem.so AFL_NO_AFFINITY=1  ./afl-fuzz -m none -i in -o out -- /mnt/scratch/fpicker -v --fuzzer-mode afl -e attach -p test -f /mnt/scratch/examples/test/fuzzer-agent.js  --communication=send