BlockWallet

BlockWallet is the most private, non-custodial Ethereum browser wallet. BlockWallet uses smart contracts that allow users to hide the amounts and origins of cryptocurrency held, in a decentralized and frictionless manner. Each time you want to make a withdrawal, BlockWallet will create a new wallet address for you with the amount of crypto that you requested, which originates from the smart contract where everyone’s funds are pooled. For more information about BlockWallet, please visit https://www.blockwallet.io

This bug bounty program is focused on their app and is focused on preventing:

• Thefts of funds of any amount
• Leak of user data
• Deletion of user data
• Access to sensitive pages without authorization

Rewards are distributed according to the impact of the vulnerability based on the Immunefi Vulnerability Severity Classification System V2.2. 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.

All app bug reports must come with a PoC in order to be considered for a reward. All Medium and Low app bug reports require a suggestion for a fix to be eligible for a reward.

The following vulnerabilities are not eligible for a reward:

• Any vulnerability that can only be abused by a local attacker
• Local Attackers (with access to the user’s machine/browser) are not part of our threat model.

Bug reports involving the ability to correctly determine the seed phrase will be paid at USD 150 000. All other extension bugs that are critical and result in loss of funds are paid at USD 50 000. High, Medium, and Low Web/App bug reports have the final reward determined by the BlockWallet team depending on exploitability, final impact, and ease of attack

Payouts are handled by the BlockWallet team directly and are denominated in USD. However, payouts are done in USDC.

All repositories of the BlockWallet wallet can be found at BlockWallet · GitHub

• https://github.com/block-wallet/extension

However, only those in the Assets in Scope table are considered as in-scope of the bug bounty program.

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

• Attacks that the reporter has already exploited themselves, leading to damage
• Attacks requiring access to leaked keys/credentials
• Attacks requiring access to privileged addresses (governance, strategist)
• Attacks that require access to the user's machine or browser, physical or remote

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)
• Lack of SSL/TLS best practices
• DDoS vulnerabilities
• Attacks requiring privileged access from within the organization
• Feature requests
• Best practices

The following activities are prohibited by this 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