cryptoPromedium

Goracle

hackerlab

Task: a Go server encrypts the flag with AES-CBC and exposes encrypt/decrypt JSON commands. Solution: reverse the binary to confirm a PKCS#7 padding oracle, then recover the remote flag block-by-block with a CBC padding-oracle attack.

oracle_attack base64 aes go_binary cbc pkcs7 padding_oracle

cbc_padding_oracle_attackgo_binary_reverse_engineeringbytewise_plaintext_recovery

$ ls tags/ techniques/

oracle_attack base64 aes go_binary cbc pkcs7 padding_oracle

cbc_padding_oracle_attackgo_binary_reverse_engineeringbytewise_plaintext_recovery

Analysis

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

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