pwnmedium-hard

Warriors (Chronos Arena)

caplag

Task: Chronos Arena binary with custom heap allocator using XOR-encrypted free-list. Solution: UAF via Time Rewind snapshot restore, leak SECRET_COOKIE via OOB read, poison free-list via OOB write, allocate chunk at g_bridge to overwrite dispatch function pointer with win function address.

$ ls tags/ techniques/

heap pwn use-after-free custom-allocator xor-encrypted-freelist free-list-poisoning arbitrary-alloc function-pointer-overwrite oob-read oob-write no-pie no-relro

function_pointer_overwriteuaf_via_state_restorefree_list_poisoningxor_cookie_leakoob_read_leakoob_write_poisonarbitrary_allocation

Analysis

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$ python3 exploit.py --target 192.168.1.1 --port 8080
[*] Connecting to target...
[+] Shell obtained!

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