CVE-2024-1441 PoC — Libvirt: off-by-one error in udevlistinterfacesbystatus()

Readme

This repo is made to reproduce fuzzing and analysis process of discovering CVE-2024-1441

# 11 used commands
```shell
# 2 commands to install packages
apt-get update
apt-get install
# 1 git command
git clone
# 4 build commands
meson
ninja
make
cargo build
# 1 command to set environment values
export
# 1 command to run fuzzing
afl-fuzz
# 2 commands to analyze crashes
casr-afl
casr-cli
```

# Prepare environment
Run docker container:
```
docker run --privileged --security-opt seccomp=unconfined -ti alt:p10
```

Install base dependencies and clone this repo:
```
apt-get update
apt-get install -y git make
git clone --recurse-submodules --shallow-submodules https://github.com/almkuznetsov/CVE-2024-1441
```

Install libvirt and preeny dependencies:
```
# install libvirt deps
apt-get install -y xsltproc xml-utils libgnutls-devel libnl-devel \
    libdevmapper-devel libpciaccess-devel udev libudev-devel \
    libpciaccess-devel libyajl-devel libpcap-devel libselinux-devel dnsmasq \
    iptables radvd ebtables libsasl2-devel util-linux lvm2 libparted-devel \
    parted dmsetup libdevmapper-devel open-iscsi libiscsi-devel libnuma-devel \
    libcap-ng-devel libcurl-gnutls-compat libcurl-devel libaudit-devel \
    pm-utils bridge-utils libblkid-devel libgcrypt-devel libp11-kit-devel \
    libreadline-devel libtasn1-devel attr libxml2-devel xsltproc python3 \
    python3-dev iproute2 dmidecode libtirpc-devel kmod autoconf-archive \
    python3-module-flake8 gnutls-utils python3-module-docutils meson rpcgen \
    libgio-devel

# install preeny deps
apt-get install -y libini_config-devel libseccomp-devel
```

Install AFL++ and it's dependencies:
```
apt-get install -y AFLplusplus llvm15.0
```

Install CASR dependencies:
```
apt-get install -y gdb rust rust-cargo
```

Build libvirt with AFL++ instrumentation:
```
cd /CVE-2024-1441/libvirt/

export CC=afl-clang-lto \
       CXX=afl-clang-lto++ \
       CFLAGS="-O0 -Wframe-larger-than=30000" \
       CXXFLAGS="-O0 -Wframe-larger-than=30000" \
       AR=llvm-ar \
       RANLIB=llvm-ranlib \
       AS=llvm-as \
       GIT_SSL_NO_VERIFY=1

meson build -Dsystem=true -Dgit_werror=disabled
cd build
ninja
```

Build desock from preeny:
```
cd /CVE-2024-1441/preeny/

export CC="gcc" \
       CFLAGS="-Werror=frame-larger-than=70000"

make -C src desock.so
```

# Run fuzzing
Create test input:
```
cd /CVE-2024-1441/
mkdir input
echo "testinput" > input/1
```

Run fuzzzing:
```
export INPUT=/CVE-2024-1441/input \
       OUTPUT=/CVE-2024-1441/out \
       LD_LIBRARY_PATH=/CVE-2024-1441/libvirt/build/src/ \
       TARGET="/CVE-2024-1441/libvirt/build/src/libvirtd -l -f /CVE-2024-1441/libvirtd.conf" \
       AFL_PRELOAD="$(ls /CVE-2024-1441/libvirt/build/src/*.so | tr -s '[:space:]' ' ') /CVE-2024-1441/preeny/src/desock.so"

afl-fuzz -i $INPUT -o $OUTPUT -- $TARGET
```

# Analyze crashes
Build CASR:
```
git clone https://github.com/ispras/casr
cd casr
cargo build --release
```

Run CASR analysis:
```
export LD_PRELOAD=" /CVE-2024-1441/preeny/src/desock.so"

./target/release/casr-afl -f -i /CVE-2024-1441/afl-out/ -o /CVE-2024-1441/casr-out -t 1

/CVE-2024-1441/casr/target/release/casr-cli /CVE-2024-1441/casr-out/cl1/id\:000000\,sig\:11\,src\:002081+001122\,time\:4318315404\,execs\:60143\,op\:splice\,rep\:1.casrep
```

Backup if analysis fails:
```
/CVE-2024-1441/casr/target/release/casr-cli /CVE-2024-1441/backup/casr-out/cl1/id\:000000\,sig\:11\,src\:001498+001021\,time\:3766191045\,execs\:60441\,op\:splice\,rep\:1.casrep
```

If something goes wrong:
```
echo core >/proc/sys/kernel/core_pattern
```

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Remarks