Incident Overview
A flashloan attack was made on the My Farm Pet project with a profit of $31k gained by the attacker
My farm pet is a blockchain farming game, where anyone can buy and own virtual farms.
The attacker created a contract in which there was a flashloan function to perform arbitration on the marketplace between versions V2 and V3. The attacker used 340k $BUSD to exchange for 22k $MYFARMPET, of which 1k were used to buy 70k $ChickenFood on My Farm Pets Marketplace V2. The contract then exchanged 21k $MYFARMPET tokens for 337k$BUSD, thereby increasing the pool on PancakeSwap, and exchanged 70k $ChickenFood on the V3 market for 34k $BUSD. Then, when the deposit of 340k was repaid, the attacker received a net profit of 31k $BUSD.
Incident Report
Protocol Information
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.
What Auditors Should Check
If you're auditing a protocol with similar architecture to My Farm Pet, these are the critical security checks that could have prevented this incident (October 2021).
- Verify all logic paths related to Flash Loan Attack are guarded by proper access controls and input validation - see the Flash Loans Attacks attack class for patterns
- 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 TrialRelated Attack Classes
The technique used in this hack maps to these vulnerability classes in our security curriculum:
Sources & References
Learn to Prevent the Next My Farm Pet
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