How much was lost in the Portal hack?

The Portal hack resulted in $326M in losses on February 02, 2022.

What attack technique was used in the Portal exploit?

The Portal exploit utilized Signature Exploit. Understanding this attack vector is critical for smart contract auditors and developers building secure DeFi protocols.

How can developers prevent similar smart contract attacks?

Preventing smart contract hacks requires a combination of secure coding practices, thorough security audits, and understanding common attack vectors like reentrancy, oracle manipulation, and access control flaws. Smart Contract Hacking (SCH) provides hands-on training to help developers and auditors identify and prevent vulnerabilities before deployment.

Portal Hack

TOTAL LOST $326M

Critical #30 All-Time Feb 02, 2022 Signature Exploit solana

Affected Chain solana Incident surface

Recovered - No recovery reported

All-Time Rank #30 By amount stolen

Auditors 1 Prior security audit

Incident Overview

A token bridge built on Wormhole.

Incident Report

Protocol / Project Portal

Date of Incident February 02, 2022

Affected Chain(s) solana

Attack Technique Signature Exploit

Classification Protocol Logic

Primary Source View Post-Mortem

Protocol Information

Protocol Type Bridge

Smart Contract Language Rust

Official Website portalbridge.com

Protocol Twitter/X @portalbridge_

Market Context at Time of Hack

Token Categories

DeFi Gaming Ethereum Ecosystem Binance Launchpool Solana Ecosystem Cross-Chain DWF Labs Portfolio Base Ecosystem

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 signature exploit and Rust/Anchor program internals and the Solana account model

Capital Required Seed capital to cover Solana network fees and initial position setup

On-Chain Access Ability to interact with solana Solana programs and deploy a custom exploit program or signer account

Protocol Analysis Identification of the exploitable vulnerability in Portal's program logic - root cause: protocol logic

Execution Speed Precise transaction ordering and timing to exploit the vulnerability within a single Solana transaction (atomic across instructions)

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? Likely — with a thorough Signature Exploit audit checklist and test coverage

Audited by Audit Report 1 — still lost $326M. Prior audits don't guarantee safety, especially after post-audit code changes.

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

Verify all logic paths related to Signature Exploit are guarded by proper access controls and input validation
Review privileged functions (owner, admin, governance) for potential abuse vectors - centralization risks should be documented and bounded with timelocks or multi-sigs

Master these auditing techniques with hands-on labs and real exploit scenarios in the Smart Contract Hacking course.

Free Trial

Security Audit History

Audit Report 1 Report

Sources & References

01
Source 1 https://twitter.com/samczsun/status/1489044939732406275?s=20&t=k…

Threat Assessment

Severity Level

CRITICAL

Attack Vector Signature Exploit
Root Cause Protocol Logic
Year 2022

Learn to Prevent the Next Portal

The Portal hack is one of many attacks that skilled auditors are trained to detect before deployment. Master real exploit patterns and defense techniques with hands-on Web3 security training.

Start Free Trial Browse Attack Library