Shell Protocol

Program Overview

The objective of the Shell Protocol is to create an internet monetary system using stablecoins as building blocks. The first release is a liquidity pool optimized for stablecoin-to-stablecoin trades. It has weights, deep liquidity, protections against a broken peg and dynamic fees.

The bug bounty program is focused around its smart contracts and the prevention of loss of user funds.

Rewards by Threat Level

Rewards are distributed according to the impact of the vulnerability based on the Immunefi Vulnerability Severity Classification System. This is a simplified 5-level scale, with separate scales for websites/apps and smart contracts/blockchains, encompassing everything from consequence of exploitation to privilege required to likelihood of a successful exploit.

Smart Contracts and Blockchain*

Level
Critical	up to 10% of funds at risk or USD $100,000, whichever is lower
High	up to USD $20,000
Medium	up to USD $5,000
Low	up to USD $1,000
None	USD $0

Websites and Apps

Level
Critical	USD $20,000
High	USD $7,500
Medium	USD $3,250
Low	USD $500
None	USD $0

Payouts are handled by the Shell Protocol team directly and are denominated in USD. Payouts are done in USDC.

*Additional TOKEN bonus once token is live for vulnerabilities over $50,000

Assets in Scope

Target	Type
https://github.com/cowri/shell-solidity-v1	Smart contract
https://etherscan.io/address/0x8f26D7bAB7a73309141A291525C965EcdEa7Bf42	Smart contract
https://etherscan.io/address/0xC2D019b901f8D4fdb2B9a65b5d226Ad88c66EE8D	Smart contract
https://shells.exchange/	Website

Prioritized Vulnerabilities

We are especially interested in receiving and rewarding vulnerabilities of the following types:

Smart Contracts/Blockchain:

• Re-entrancy
• Logic errors
  • including user authentication errors
• Solidity/EVM details not considered
  • including integer over-/under-flow
  • including unhandled exceptions
• Trusting trust/dependency vulnerabilities
  • including composability vulnerabilities
• Oracle failure/manipulation
• Novel governance attacks
• Economic/financial attacks
  • including flash loan attacks
• Congestion and scalability
  • including running out of gas
  • including block stuffing
  • including susceptibility to frontrunning
• Consensus failures
• Cryptography problems
  • Signature malleability
  • Susceptibility to replay attacks
  • Weak randomness
  • Weak encryption
• Susceptibility to block timestamp manipulation
• Missing access controls / unprotected internal or debugging interfaces

Web/App

• Remote Code Execution
• Trusting trust/dependency vulnerabilities
• Vertical Privilege Escalation
• XML External Entities Injection
• SQL Injection
• LFI/RFI
• Horizontal Privilege Escalation
• Stored XSS
• Reflective XSS with impact
• CSRF
• CSRF with impact
• Direct object reference
• Internal SSRF
• Session fixation
• Insecure Deserialization
• Direct object reference
• Path Traversal
• DOM XSS
• SSL misconfigurations
• SSL/TLS issues (weak crypto, improper setup)
• URL redirect
• Clickjacking
• Misleading Unicode text (e.g. using right to left override characters)
• Coercing the application to display/return specific text to other users

Out of Scope & Rules

The following vulnerabilities are excluded from the rewards for this bug bounty program:

All Programs

• Attacks that the reporter has already exploited himself, leading to damage
• Attacks that rely on social engineering
• Attacks requiring access to leaked keys/credentials

Smart Contracts/Blockchain

• Smart Contracts/Blockchain
• Incorrect data supplied by third party oracles
  • Not to exclude oracle manipulation/flash loan attacks
• Basic economic governance attacks (e.g. 51% attack)
• Lack of liquidity
• Best practice critiques
• Sybil attacks

Websites and Apps

• Theoretical vulnerabilities without any proof or demonstration
• Content spoofing / Text injection issues
• Self-XSS
• Captcha bypass using OCR
• CSRF with no security impact (logout CSRF, change language, etc.)
• Missing HTTP Security Headers (such as X-FRAME-OPTIONS) or cookie security flags (such as “httponly”)
• Server-side information disclosure such as IPs, server names, and most stack traces
• Vulnerabilities used to enumerate or confirm the existence of users or tenants
• Vulnerabilities requiring unlikely user actions
• URL Redirects (unless combined with another vulnerability to produce a more severe vulnerability)

The following activities are prohibited by bug bounty program:

• Any testing with mainnet or public testnet contracts; all testing should be done on private testnets
• Any testing with pricing oracles or third party smart contracts
• Attempting phishing or other social engineering attacks against our employees and/or customers
• Any testing with third party systems and applications (e.g. browser extensions) as well as websites (e.g. SSO providers, advertising networks)
• Any denial of service attacks
• Automated testing of services that generates significant amounts of traffic
• Public disclosure of an unpatched vulnerability in an embargoed bounty