Defrost Hack

TOTAL LOST $6.0M
Medium Oracle Manipulation avalanche

Summarize with AI

ChatGPT Perplexity Claude Grok
Affected Chain avalanche Incident surface
Recovered - No recovery reported
All-Time Rank #398 By amount stolen
Auditors 1 Prior security audit

Incident Overview

Defrost Finance is a decentralized protocol that allows you to leverage yield-bearing Tokens or other pool tokens from Avalanche and cross-chain protocols as collaterals for generating H2O, a USD-pegged stablecoin.

This is classified as a Oracle Manipulation & Price Manipulation . Compare similar hacks →

Incident Report

Protocol / Project Defrost
Date of Incident
Affected Chain(s) avalanche
Attack Technique Oracle Manipulation
Classification Rugpull
Primary Source View Post-Mortem

Protocol Information

Protocol Type CDP
Smart Contract Language Solidity
Official Website defrogs.com/
Protocol Twitter/X @Defrost_Finance

Market Context at Time of Hack

Token Categories
Memes Ethereum Ecosystem ERC404 Hybrid token standard
Protocol Links

What the Attacker Needed to Succeed

Understanding the prerequisites for this type of attack helps auditors identify protocols that are most at risk and helps developers build better defenses.

Technical Knowledge Deep understanding of oracle manipulation and Solidity and EVM internals
Capital Required Seed capital to cover gas and initial position setup
On-Chain Access Ability to interact with avalanche smart contracts and deploy a custom exploit contract
Protocol Analysis Identification of the exploitable vulnerability in Defrost's contract logic - root cause: rugpull
Execution Speed Precise transaction ordering and timing to exploit the vulnerability within a single atomic block
Obfuscation Plan A strategy to launder and move stolen funds - typically through mixers, cross-chain bridges, or decentralized DEX swaps to resist tracing

What Auditors Should Check

Could this have been caught in audit? Yes — skilled auditors routinely flag Oracle Manipulation vulnerabilities in code review
Audited by Audit Report 1 — still lost $6.0M. Prior audits don't guarantee safety, especially after post-audit code changes.

If you're auditing a protocol with similar architecture to Defrost, these are the critical security checks that could have prevented this incident (December 2022).

  • Verify all logic paths related to Oracle Manipulation are guarded by proper access controls and input validation - see the Oracle Manipulation & Price Manipulation attack class for patterns
  • Audit oracle price feeds for manipulation risks - ensure time-weighted average prices (TWAPs) or multi-source aggregators are used, not spot prices
  • Review privileged functions (owner, admin, governance) for potential abuse vectors - centralization risks should be documented and bounded with timelocks or multi-sigs

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Security Audit History

Related Attack Classes

The technique used in this hack maps to these vulnerability classes in our security curriculum:

See all Oracle Manipulation & Price Manipulation examples →

Oracle Manipulation & Price Manipulation

Proof-of-Concept Exploits

1 PoC available
poc-exploits - defrost
$ Defrost Reentrancy

On-Chain Evidence & References

Sources & References

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