Privilege Escalation via Race Condition in Linux Kernel AF_PACKET (CVE-2016-8655)

This repository contains a single Metasploit module: 'AF_PACKET chocobo_root Privilege Escalation' (modules/exploits/linux/local/af_packet_chocobo_root_priv_esc.rb). The module exploits a race condition and use-after-free vulnerability (CVE-2016-8655) in the Linux kernel's AF_PACKET implementation (packet_set_ring function) to escalate privileges to root. The exploit targets Ubuntu (Trusty/Xenial) and Linux Mint systems running vulnerable kernels (4.4.0 < 4.4.0-53), requiring unprivileged user namespaces, at least two CPU cores, and SMAP to be disabled. The module uploads and compiles (or drops a precompiled) exploit binary and a Metasploit-generated payload to a writable directory (default: /tmp), executes the exploit to gain root, and runs the payload as root. The exploit is operational and provides root access if successful. The only fingerprintable endpoint is the use of the /tmp directory for file operations. The module is not a detection script and is a fully functional local privilege escalation exploit.

This repository contains a local privilege escalation exploit for CVE-2016-8655, targeting a race condition in the Linux kernel's AF_PACKET implementation. The main file, 'CVE-2016-8655.c', is a C program that exploits this vulnerability to gain root privileges on affected systems. The exploit is specifically tailored for Ubuntu 16.04 x86_64 with kernel versions 4.4.0-36-generic, 4.4.0-47-generic, and 4.4.0-51-generic, but includes offsets for other kernel versions (though these are untested and may crash the system). The exploit works by manipulating kernel memory and sysctl tables via a race condition, ultimately allowing the attacker to execute code as root. Upon successful exploitation, the binary sets itself as SUID root and spawns a root shell by executing /bin/bash. The repository also includes a README.md with usage instructions and background information. No network endpoints are involved; the attack vector is purely local, requiring execution on the target machine.

This repository is a comprehensive exploit toolkit targeting the CVE-2016-5195 (Dirty COW) vulnerability and related race conditions in the Linux kernel, specifically as implemented in the Android goldfish 3.4 emulator kernel and similar devices (e.g., Moto G4/harpia). The structure is modular, with directories for different device targets (goldfish, harpia, rabit_hole) and supporting kernel modules (mod_exploit, mod_nop). The main exploit logic is implemented in C, with Makefiles for cross-compilation to ARM/Android. The exploit works by leveraging a race condition in AF_PACKET socket handling to achieve arbitrary kernel code execution. The payload is injected via a kernel module and demonstrated by writing to the kernel tracing buffer. The repository includes scripts and binaries for deploying and running the exploit on an Android device or emulator. The attack vector is local privilege escalation, requiring code execution on the target device. The exploit is operational and can be adapted for full privilege escalation or other kernel-level attacks. Notable endpoints include /sys/kernel/debug/tracing/trace, /proc/self/pagemap, and local socket connections to 127.0.0.1. The codebase is large and well-structured, with clear separation between device-specific and generic exploit components.