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MUDIT GUPTA'S BLOG

A Blog by Mudit Gupta for Rust, Solidity and Blockchain Discussion

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WINTERMUTE MUTED IN CRYPTO WINTER

Hacks / By Mudit Gupta / September 20, 2022 September 20, 2022

Ok, Sorry for the bad headline. Back to the topic now… Wintermute was hacked for
~160m a few hours ago. I took a quick look and my best guess is that it was a
hot wallet compromise due to the Profanity bug that was publicly disclosed a few
days ago by 1inch team. The attack …

Wintermute muted in crypto winter Read More »


CREAMED CREAM – LEARN THE SECRET RECIPE (CREAM HACK ANALYSIS)

Hacks / By Mudit Gupta / October 28, 2021 October 28, 2021

Cream Finance was hacked again on 27th October 2021. Likely for the final time.
The attacker stole $130m+ worth of assets from Cream’s lending protocol. The
attack was executed over multiple transactions due to block gas limits, but the
bulk of it happened in this transaction. This was one of the most sophisticated
and cleanly …

Creamed Cream – Learn the Secret Recipe (Cream Hack Analysis) Read More »


LIVE STREAM #1 – AUDITING SMART CONTRACTS

Development / By Mudit Gupta / August 22, 2021 August 22, 2021

I will do live security reviews of Ethereum smart contracts and share my
approach to auditing on a stream. The live stream is scheduled to start at 3.30
PM GMT on Sunday (22/08/2021). Link: https://www.youtube.com/watch?v=LLiJK_VeAvQ
Notes Here are some brief notes that I’ll use as talking points on the stream. A
detailed blog post will …

Live Stream #1 – Auditing Smart Contracts Read More »


A PEEK INSIDE THE MISO WAR ROOM – $350M INCIDENT RESPONSE STORY

Personal, Writeups / By Mudit Gupta / August 18, 2021 August 18, 2021

The Bug The DutchAuction smart contract inherits the BoringBatchable utility
contract that allows callers to batch different calls together. There is a
commitEth function in the auction contract that uses msg.value to know the
amount of ETH commited by the user. If the user commits more ETH than the
contract’s capacity, the contract refunds the …

A peek inside the MISO war room – $350m incident response story Read More »


POLY NETWORK HACK ANALYSIS – LARGEST CRYPTO HACK

Hacks / By Mudit Gupta / August 11, 2021 August 13, 2021

On 10th August 2021, Poly Network suffered from a hack that caused a loss of
over 600 million dollars. The hack happened across multiple blockchains
including Ethereum, Binance Smart Chain, and Polygon. This is the largest crypto
hack yet. Poly Network is a Blockchain interoperability project that allows
people to send transactions across blockchains. One …

Poly Network Hack Analysis – Largest Crypto Hack Read More »


COVER PROTOCOL HACK ANALYSIS: INFINITE COVER TOKENS MINTED VIA AN EXPLOIT

Hacks / By Mudit Gupta / December 28, 2020 December 29, 2020

A bug was exploited in the Cover protocol’s liquidity mining/farming contract
called Blacksmith. Multiple hackers used the bug to mint practically infinite
tokens. The biggest hacker burned most of the hacked tokens and returned 4350
ether but there still are around 70 thousand Cover tokens in circulation that
were created using this exploit and shouldn’t exist. The original hacker has
cashed out about 1400 ether, 1 million DAI, 3k LINK, and 90 WBTC, about $4.4
million in total already.


FORK A SUBSTRATE BASED BLOCKCHAIN

Development / By Mudit Gupta / July 20, 2020 July 20, 2020

This blog post will guide you through the process of forking a substrate
blockchain like Polkadot. Substrate does not offer any forking capabilities out
of the box but we can still create a “fork” relatively easily. I created a small
script to make the process much easier, you can find the script here. How does …

Fork a substrate based blockchain Read More »


SUBSTRATE DEEP DIVE: IMBALANCES

Development, Rust / By Mudit Gupta / July 12, 2020 July 12, 2020

This article kicks off a series of technical Substrate articles that I have
planned. I will be discussing various specifics of Substrate in these articles
that will help developers building on top of Substrate understand Substrate
better. The topic for this post is Substrate’s Imbalances. Background The
balances module of Substrate’s FRAME runtime maintains a …

Substrate Deep Dive: Imbalances Read More »


FREE BLOCKCHAIN STORAGE – TALE OF A BUG IN SUBSTRATE’S FRAME RUNTIME

Writeups / By Mudit Gupta / July 7, 2020 July 20, 2020

This is the story of a simple bug in the FRAME runtime of Parity’s Substrate
blockchain framework. The bug allowed attackers to do infinitely large
transactions without paying any extra fees. The vulnerability was the result of
a buggy implementation of fee calculation in the FRAME runtime of Substrate. By
exploiting this vulnerability, an attacker …

Free blockchain storage – Tale of a bug in Substrate’s FRAME runtime Read More »


RUST LANG TIPS AND TRICKS

Development, Rust / By Mudit Gupta / April 21, 2020 April 24, 2020

Rust is a programming language that is geared towards speed and safety. Rust has
gained a lot of adoption in the past few years and developers are loving it.
Although there are numerous other systems programming languages, Rust is one of
the very few alternatives to C/C++ that can hold its own when it comes …

Rust lang Tips and Tricks Read More »

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MUDIT’S RECENT POSTS

 * Wintermute muted in crypto winter
 * Creamed Cream – Learn the Secret Recipe (Cream Hack Analysis)
 * Live Stream #1 – Auditing Smart Contracts
 * A peek inside the MISO war room – $350m incident response story
 * Poly Network Hack Analysis – Largest Crypto Hack


ABOUT MUDIT GUPTA

Mudit Gupta is a hacker/developer from India. Mudit is passionate about
Blockchains, security, coding, and Gaming. Mudit loves solving logical problems,
researching new stuff, developing secure software, and breaking insecure
software.


CATEGORIES

 * Development
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 * Hacks
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 * Rust
 * Solidity
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