Buffer-Overflow

Overview Machine author: TheHermit. Host: Ubuntu, with Docker containers (Debian 8 Jessie). Theme: Star Trek: The Next Generation. Chain: recon, SQL injection in a custom WordPress plugin, credentials in a draft post, Joomla admin, PHP shell upload via eXtplorer, a www-data shell on the host (outside Docker), a SUID stack buffer overflow in /bin/lcars, root. The key trap: there are two different www-data shells. One is in a Docker container (WordPress/Joomla), the other is on the real host (via Apache on 443). Root only comes from the second one. ...

Overview Machine author: rastating. Focus: privilege escalation (misconfiguration / service abuse, and a ret2libc BOF). 1 2 3 4 5 6 7 8 9 10 recon +- leaky API /api/users/ -> crack hashes -> login as web admin v download myplace.backup (base64 -> zip) +- crack the zip password (john) -> application source -> Mongo creds v SSH as mark (password reuse) +- privesc #1 (mark -> tom): a Mongo-driven scheduler runs exec() as tom v privesc #2 (tom -> root): SUID /usr/local/bin/backup -> ret2libc BOF (plus unintended methods) Skills: API enumeration, credential reuse, service abuse through a database, SUID binary analysis (ltrace/Ghidra), ret2libc, NX + ASLR bypass, blacklist filter bypass. ...