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Created May 15, 2021
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How to bypass BitGo's error when using a Ledger wallet

How to bypass BitGo's error when using a Ledger wallet

BitGo recently updated the version of its bitcoinjs-lib dependency, but failed to update the code that interacted with legacy wallets that relied on Ledger hardware wallets. This triggered a r.bufferutils.varIntSize is not a function error whenever trying to use the funds in the wallet. Following is a workaround you can use to manually patch the error, and get your funds out of BitGo.

Disclaimer: I set up this workaround to help a friend rescue their funds. I have no idea if it works for every instance of this error, and it may lead to loss of funds. I strongly suggest that you try it out with a small amount before you attempt to remove all your bitcoin from BitGo.

The problem

The problem seems to happen when interacting with a legacy wallet managed by a Ledger hardware wallet. You have a legacy wallet if BitGo displays the following notice when you open your wallet (fun fact: the link to the instructions to migrate to a new BitGo wallet is broken).

This is an older BitGo wallet. Follow these instructions to upgrade to the newest, most feature-rich BitGo wallet.

When trying to send a transaction, you'll get a r.bufferutils.varIntSize is not a function displayed at the top of the page, even before you get any prompt in your Ledger. I contacted BitGo about this, and they claim that the error is on Ledger's side, so until they recognize the issue, you can try using the following script to bypass the error.

The error

Bringing up the developer console and hitting to pause on caught exceptions when trying to send a transaction will show that the legacy.js script is trying to use the varIntSize function from bufferutils. However, the bufferutils module present does not have that function.

Inspecting the functions exposed by bufferutils in bitcoinjs-lib, it shows that varIntSize was present in version 3 but removed in the latest version, and the methods found in the BitGo script correspond to this latest release.

The dependency

The workaround I found is to stop script execution in the BitGo page right before it tries to use the bufferutils module, and manually replace it with the bundled version of bufferutils v3: see bundle.js in this gist for its content.

If you want to generate that bundle yourself (which you should, instead of blindly trusting a stranger in the Internet that tells you to inject an indecipherable script for managing your crypto), you can set up a new npm project with the required dependencies:

npm init -y && npm install webpack webpack-cli bitcoinjs-lib@3 buffer

Create an index.js file that exports the module you need:

module.exports = require('bitcoinjs-lib/src/bufferutils');

And use this webpack config to bundle it:

module.exports = {
  entry: './index.js',
  target: 'web',
  mode: 'production',
  resolve: {
    extensions: ['.js'],
    fallback: { 'buffer': require.resolve("buffer/") }
  },
  output: {
    filename: 'bundle.js',
    library: { type: 'var', name: 'bufferutils' }
  },
};

The workaround

Send a new transaction from your BitGo wallet, and before confirming it on the last page, bring up the developer console in your browser and set up a breakpoint on L31850 of the file legacy.js, which is where bufferutils is first used. Make sure to pretty-print the file so it's manageable. If you cannot find the location, you can also choose to pause on caught exceptions and confirm the transaction: script execution will stop on the line you want.

Once there, paste the contents of the bundle.js on the console, and type r.bufferutils = bufferutils. This will replace the bufferutils module used by the current execution by the bundle you've inserted, which corresponds to the old v3 version. Continue script execution, and that should do it!

It's worth mentioning that we sometimes got an error related to redeemscript on L31886 in the same file. We set up another breakpoint there and re-run the transaction, but on the second execution everything worked smoothly.


I hope this script is not needed for long and BitGo fixes the bug soon. In the meantime, if you need to access your funds and are running into this error, I hope this can help!

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