Fortress
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HackTheBox Synacktiv Fortress — Full 7-Flag Walkthrough (Symfony → RMI → Crypto → SELinux)
Complete Synacktiv Fortress writeup translated from the xchg2pwn Spanish original. 7 flags: Symfony _fragment RCE, Java RMI deserialization with CommonsCollections6, ChaCha20 APK reversing, Squid proxy pivot with corkscrew, less escape, sudo file-read → Erlang cookie → root RCE, and PwnKit (CVE-2021-4034) to bypass SELinux.
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