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You're reading from  Ethereum Smart Contract Development

Product typeBook
Published inFeb 2018
Reading LevelIntermediate
PublisherPackt
ISBN-139781788473040
Edition1st Edition
Languages
Solidity
Tools
Ethereum
Concepts
Cryptocurrency
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Author (1)
Mayukh Mukhopadhyay
Mayukh Mukhopadhyay
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Mayukh Mukhopadhyay

Mayukh Mukhopadhyay started his career as a BI developer. After the 2008-09 financial crisis, he was at Tata Consultancy Services for one of their Fortune 500 clients in the telecom sector. Holding a master's in software engineering from Jadavpur University, he is presently working as a data insight developer, where he focuses on applying data science and machine learning to raw telecom equipment logs to generate business insights. He has a varied list of academic interests, ranging from audio signal processing, structural bioinformatics, and bio-inspired algorithms to consciousness engineering. Apart from being an Oracle Certified Specialist, he is a Certified Bitcoin Professional, recognized by C4 (Crypto Currency Certification Consortium). He tries to apply blockchain as a technology to different business domains.
Read more about Mayukh Mukhopadhyay

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Parity hack returns

In the previous chapter on solidity, we discussed the parity hack by the multi-signature wallet in the library contract. After that hack, the parity team had changed the library contract with the necessary fix. However, in doing so, they forgot to audit the other sections of the library smart contract, which had a new vulnerability.

Figure 8.10 shows the portion of the self-destruct code, which was available to outside users. A rookie developer with the alias name devops199 accessed this function and accidentally executed it. Hence, the entire library contract self-destructed and took itself off the blockchain.

The impact was realized much later when the wallets calling this library became meaningless and the tokens worth multimillion USD remained trapped forever in these dangling wallet contracts. Such hack stories make us realize the importance of peer review on any open source code and demonstrate why we should use hard wallets in place of a hot wallet.

Figure 8.10: Suicide...

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Ethereum Smart Contract Development
Published in: Feb 2018Publisher: PacktISBN-13: 9781788473040
© 2018 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Mayukh Mukhopadhyay

Mayukh Mukhopadhyay started his career as a BI developer. After the 2008-09 financial crisis, he was at Tata Consultancy Services for one of their Fortune 500 clients in the telecom sector. Holding a master's in software engineering from Jadavpur University, he is presently working as a data insight developer, where he focuses on applying data science and machine learning to raw telecom equipment logs to generate business insights. He has a varied list of academic interests, ranging from audio signal processing, structural bioinformatics, and bio-inspired algorithms to consciousness engineering. Apart from being an Oracle Certified Specialist, he is a Certified Bitcoin Professional, recognized by C4 (Crypto Currency Certification Consortium). He tries to apply blockchain as a technology to different business domains.
Read more about Mayukh Mukhopadhyay

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