VERDICT —UNRATED
Verdict pending. Auto-ingested incidents are reviewed before a public verdict is rendered.
Root cause
Root-cause analysis not yet published. The incident description below contains all currently available signal — review the attack transaction directly for definitive forensics.
▰ PROOF OF CONCEPT
DEFIHACKLABS
src/test/2021-08/PolyNetwork_exp.sol
view forked test on github ↗Reproducible Foundry test fork from SunWeb3Sec/DeFiHackLabs. Clone the repo, run forge test against the file path above, and replay the exploit against a mainnet fork at the historical block. Use for reproduction only — not for live targets.
Forensic narrative
The Polygon ecological project PolyDEX had a hacking incident. The hackers carried out a reentry attack on the Token Locker smart contract and stole about $500,000 worth of funds from the project. Attack method (per SlowMist): ERC777 Reentrancy Attack. Reported loss: $ 500,000.
Primary source
https://polydex.medium.com/plx-locker-smart-contract-incident-post-mortem-75342124a3e8 ↗Sourced from
slowmist
Technical record
- chain
- polygon
- protocol
- PolyDEX
- bug_class
- reentrancy
- date_occurred
- 2021-06-20
- loss_usd
- $500,000
- source_id
- sm:polydex::2021-06-20
Related — same bug class· reentrancy