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CVE-2022-20009 is an out-of-bounds write vulnerability in various functions of the Android kernel USB gadget subsystem. A missing bounds check permits a write beyond the intended buffer boundary and can enable local privilege escalation.
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This repository provides a proof-of-concept (POC) exploit for CVE-2022-20009, a buffer overflow vulnerability in certain Android Linux kernel USB gadget drivers (f_accessory, f_audio_source, f_gsi, f_mtp, f_qc_rndis, f_rmnet). The main exploit script, gadget.py, is written in Python and uses the pyusb library to send crafted USB control transfer requests with an oversized wLength field to a physically connected Android device. The exploit requires the host to use a custom build of libusb with an increased MAX_CTRL_BUFFER_LENGTH (0xffff). The script allows the user to specify the target device's vendor and product IDs, the USB gadget function to target, and the length of the data to send. If successful, the exploit can cause a buffer overflow in the kernel, potentially leading to information disclosure, denial of service, or code execution. The repository is structured with a single exploit script, a README.md providing technical details and usage instructions, a LICENSE file, and a .gitignore. No network endpoints are involved; the attack vector is via physical USB connection.
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