Home Cyber Security News TruffleHog – Now a Browser Extension That Detects Secret Keys In JavaScript

TruffleHog – Now a Browser Extension That Detects Secret Keys In JavaScript

by Abeerah Hashim
TruffleHog browser extension

Researchers have presented a dedicated browser extension, “TruffleHog,” that can facilitate bug bounty hunters. The tool helps find secret API keys in JavaScript code.

About TruffleHog Browser Extension

Researchers from Truffle Security have developed the TruffleHog tool as a handy browser extension for security researchers.

Sharing the details via a blog post, Dylan Ayrey, cofounder of the firm, explained that the tool can help organizations prevent security risks due to exposed secret keys.

TruffleHog itself isn’t a new tool and has been around for many years with developers making constant improvements.

TruffleHog is available as an open-source Chrome browser extension.

The tool finds API keys embedded within JavaScript code. Such keys often appear in an apps’ frontend when APIs allow CORS (Cross-Origin Resource Sharing). As stated in the post,

By default websites can’t just make request and read the response to other API’s without the foreign API inviting them to do so with a permissive CORS header.
Amazon AWS API’s as well as many other SaaS and Cloud provider API’s have extremely permissive CORS settings.
This… not only encourages websites to make requests to AWS, but because AWS’s APIs are credentialed, this encourages Javascript to contain AWS credentials.

Despite its usefulness, this feature also threatens internal apps’ security, which may be a threat for businesses.

Because multiple frontend applications often consume the same backend API, many internal apps unfortunately get scopes with permissive CORS settings… a foreign origin from the open internet with the ability to make requests to internal apps and API’s, view the responses, and steal API keys hardcoded client-side in the internal applications.

Real-World Application

Bounty hunters and researchers can use this tool to find such keys and report them to the firms and vendors. This tool may also help security teams within businesses for internal assessments.

Alongside JavaScript, the TruffleHog tool extension can also scan detect .git directories and .env files that can contain credentials.

Researchers have submitted the tool for review on the Chrome Store. Meanwhile, interested users can sideload the tool from GitHub.

Let us know your thoughts in the comments.

You may also like

1 comment

Dylan Ayrey September 29, 2021 - 4:32 pm

Thanks for the story Abeerah!


Comments are closed.

Latest Hacking News

Privacy Preference Center


The __cfduid cookie is used to identify individual clients behind a shared IP address and apply security settings on a per-client basis.

cookie_notice_accepted and gdpr[allowed_cookies] are used to identify the choices made from the user regarding cookie consent.

For example, if a visitor is in a coffee shop where there may be several infected machines, but the specific visitor's machine is trusted (for example, because they completed a challenge within your Challenge Passage period), the cookie allows Cloudflare to identify that client and not challenge them again. It does not correspond to any user ID in your web application, and does not store any personally identifiable information.

__cfduid, cookie_notice_accepted, gdpr[allowed_cookies]


DoubleClick by Google refers to the DoubleClick Digital Marketing platform which is a separate division within Google. This is Google’s most advanced advertising tools set, which includes five interconnected platform components.

DoubleClick Campaign Manager: the ad-serving platform, called an Ad Server, that delivers ads to your customers and measures all online advertising, even across screens and channels.

DoubleClick Bid Manager – the programmatic bidding platform for bidding on high-quality ad inventory from more than 47 ad marketplaces including Google Display Network.

DoubleClick Ad Exchange: the world’s largest ad marketplace for purchasing display, video, mobile, Search and even Facebook inventory.

DoubleClick Search: is more powerful than AdWords and used for purchasing search ads across Google, Yahoo, and Bing.

DoubleClick Creative Solutions: for designing, delivering and measuring rich media (video) ads, interactive and expandable ads.



The _ga is asssociated with Google Universal Analytics - which is a significant update to Google's more commonly used analytics service. This cookie is used to distinguish unique users by assigning a randomly generated number as a client identifier. It is included in each page request in a site and used to calculate visitor, session and campaign data for the sites analytics reports. By default it is set to expire after 2 years, although this is customisable by website owners.

The _gat global object is used to create and retrieve tracker objects, from which all other methods are invoked. Therefore the methods in this list should be run only off a tracker object created using the _gat global variable. All other methods should be called using the _gaq global object for asynchronous tracking.

_gid works as a user navigates between web pages, they can use the gtag.js tagging library to record information about the page the user has seen (for example, the page's URL) in Google Analytics. The gtag.js tagging library uses HTTP Cookies to "remember" the user's previous interactions with the web pages.

_ga, _gat, _gid