mlhard

leadgate

dicectf2026

Task: modified GPT-2 model (safetensors) fine-tuned to suppress generating a specific string (the flag). Solution: negate the weight perturbation (W_orig - ΔW instead of W_orig + ΔW) to invert suppression into promotion, then greedy decode from 'dice{' prefix to extract the formerly forbidden flag.

$ ls tags/ techniques/

neural_network gpt2 safetensors fine_tuning instruction_tuning weight_perturbation svd transformers lora suppression

weight_perturbation_negationsvd_analysisinstruction_tuning_suppression_inversiongreedy_decodingmodel_diff_analysis

Analysis

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

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