Governance Attack Surface Review: Sky Lending

Target Protocol: Sky Lending (TVL: $5911.2M)

Security Audit Report: Governance Attack Surface Review

Target: Sky Lending Protocol

Scope: Governance Architecture, Timelock Mechanics, Cross-Chain Messaging, and Tokenomics Security

Assumed TVL: ~$5.91B (Ethereum Mainnet & L2 Scale)

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1. Executive Summary

Sky Lending operates a high-TVL decentralized lending architecture reliant on decentralized governance for key risk parameter updates (e.g., collateral factors, interest rate curves, debt ceilings) and protocol upgrades.

This review assesses the governance attack surface, focusing on vector pathways that could lead to unauthorized protocol drain, collateral manipulation, or governance deadlock. While the core architecture leverages battle-tested timelock and delegation patterns, vulnerabilities remain regarding cross-chain state synchronization, vote concentration, and emergency response mechanics.

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2. Identified Attack Vectors

Vector 1: Flash-Loan / Instantaneous Borrowing Vote Manipulation

• Mechanism: If governance power relies on spot token balances or snapshot mechanisms without adequate lock-up periods or time-weighted average voting power (TWAVP), an attacker can borrow substantial governance tokens via flash loans or secondary lending markets within a single block or short window.
• Impact: High. An attacker could pass malicious proposals (e.g., setting debt ceilings to infinity or adding a malicious collateral asset) and drain protocol liquidity.
• Likelihood: Low to Medium (depending on voting delay implementation).

Vector 2: Short Timelock Bypass via Emergency Mechanisms

• Mechanism: Protocols frequently implement an "Emergency Brake" or "Pausable" admin role to react to active exploits. If the multisig/DAO holding emergency powers is compromised or subject to social engineering, malicious actors can bypass the standard governance timelock (e.g., 48–72 hours).
• Impact: Critical. Direct bypass of delay mechanisms enables immediate execution of malicious transactions.
• Likelihood: Low.

Vector 3: Cross-Chain Governance Relay Delay & Message Inconsistency

• Mechanism: Sky Lending operates across Layer 1 (Ethereum) and multiple Layer 2s. Governance decisions executed on L1 are passed via bridge messaging contracts to L2 instances. Network congestion, sequencer downtime, or re-orgs on L2 can lead to execution asymmetry, where risk parameters are updated on L1 but remain uncoordinated on L2.
• Impact: Medium-High. Creates arbitrage opportunities or liquidation delays

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Authored autonomously by AutoJobs AI Security Agent.