As smart contract security constantly evolves, property-based fuzzing has become a go-to technique for developers and security engineers. This technique relies on the creation of code properties – often called invariants – which describe what the code is supposed to do. To help the community define properties, we are releasing a set of 168 pre-built […]
In part one of this two-part series, we escaped Webviews in real-world misconfigured VSCode extensions. But can we still escape extensions if they are well-configured? In this post, we’ll demonstrate how I bypassed a Webview’s localResourceRoots by exploiting small URL parsing differences between the browser—i.e., the Electron-created Chromium instance where VSCode and […]
TL;DR: This two-part blog series will cover how I found and disclosed three vulnerabilities in VSCode extensions and one vulnerability in VSCode itself (a security mitigation bypass assigned CVE-2022-41042 and awarded a $7,500 bounty). We will identify the underlying cause of each vulnerability and create fully working exploits to demonstrate how an […]
I discovered a logic bug in the readline dependency that partially reveals file information when parsing the file specified in the INPUTRC environment variable. This could allow attackers to move laterally on a box where sshd is running, a given user is able to login, and the user’s private key […]
In fall 2022, Trail of Bits audited cURL, a widely-used command-line utility that transfers data between a server and supports various protocols. The project coincided with a Trail of Bits maker week, which meant that we had more manpower than we usually do, allowing us to take a nonstandard approach to the […]
During my internship at Trail of Bits, I prototyped a harness that improves the testability of the eBPF verifier, simplifying the testing of eBPF programs. My eBPF harness runs in user space, independently of any locally running kernel, and thus opens the door to testing of eBPF programs across different kernel versions. […]
A new tool for Windows RPC research By Aaron LeMasters Trail of Bits is releasing a new tool for exploring RPC clients and servers on Windows. RPC Investigator is a .NET application that builds on the NtApiDotNet platform for enumerating, decompiling/parsing and communicating with arbitrary RPC servers. We’ve added visualization and additional features that offer […]
Read the official announcement on the Sigstore blog as well! Trail of Bits is thrilled to announce the first stable release of sigstore-python, a client implementation of Sigstore that we’ve been developing for nearly a year! This work has been graciously funded by Google’s Open Source Security Team (GOSST), who we’ve also […]
Trail of Bits is publicly disclosing four vulnerabilities that affect wolfSSL: CVE-2022-38152, CVE-2022-38153, CVE-2022-39173, and CVE-2022-42905. The four issues, which have CVSS scores ranging from medium to critical, can all result in a denial of service (DoS). These vulnerabilities have been discovered automatically using the novel protocol fuzzer tlspuffin. This blog post […]
This time last year, we wrote about the more than 190 Trail of Bits-authored pull requests that were merged into non-Trail of Bits repositories in 2021. In 2022, we continued that trend by having more than 400 pull requests merged into non-Trail of Bits repositories! Why is this significant? While we take […]
Trail of Bits recently completed a security review of cURL, which is an amazing and ubiquitous tool for transferring data. We were really thrilled to see cURL founder and lead developer Daniel Stenberg write a blog post about the engagement and the report, and wanted to highlight some important things he pointed […]
The naive approach to searching for patterns in source code is to use regular expressions; a better way is to parse the code with a custom parser, but both of these approaches have limitations. During my internship, I prototyped an internal tool called Syntex that does searching on Clang ASTs to avoid […]
A Primer on Process Reparenting in Windows By Yarden Shafir Process reparenting is a technique used in Microsoft Windows to create a child process under a different parent process than the one making the call to CreateProcess. Malicious actors can use this technique to evade security products or break process ancestry ties, making detection more […]
During my internship at Trail of Bits, I explored the effectiveness of symbolic execution for finding vulnerabilities in native applications ranging from CTF challenges to popular open source libraries like image parsers, focusing on finding ways to enhance ManticoreUI. It is a powerful tool that improves accessibility to symbolic execution and vulnerability […]
Trail of Bits maintains Manticore, a symbolic execution engine that can analyze smart contracts and native binaries. While symbolic execution is a powerful technique that can augment the vulnerability discovery process, it requires some base domain knowledge and thus has its own learning curve. Given the plethora […]
