Category: Android

Hardware key attestation lets an Android app prove to its backend that a key lives in secure hardware on a locked, verified device. It is also the wall that stops a security analyst working on a rooted phone. This article opens the mechanism from the analyst's chair, from the certificate chain and the attestation extension down to the root of trust, then shows a simple bypass that never touches the secure hardware. We relay the attestation to a clean device and splice a genuine chain back into the target app with a Frida hook. A companion repository ships the validation backend, the demo apps and the instrumentation, so the whole setup can be run and inspected rather than taken on faith.

A signature verification bypass in a function that verifies the integrity of ZIP archives in the AOSP framework

We discovered several vulnerabilities impacting the boot chain of several Samsung devices. Chained together, they allow us to execute code in the bootloader, get root access on Android with persistency, and finally leak anything from the Secure World's memory including the Android Keystore keys.

Study of an Android runtime (ART) hijacking mechanism for bytecode injection through a step-by-step analysis of the packer used to protect the DJI Pilot Android application.

Join us in our journey into modern Android's Data Encryption at rest, in which we study how it works and assess how resistant it is against attackers having access to a range of high end software vulnerabilities.

This article is about greybox fuzzing of userland targets that can be encountered in Android using AFL++ and its Frida mode. We also discuss how to target JNI functions, to test the native features invoked by Java code.

Following our presentation at Black Hat USA, in this blog post we provide some details on CVE-2022-20233, the latest vulnerability we found on Titan M, and how we exploited it to obtain code execution on the chip.

In this blog post, we present a new vulnerability dataset composed of thousands of vulnerabilities aimed at helping security practitioners to develop, test and enhance their tools. Unlike others, this dataset contains both the vulnerable and fixed states with source data.

When analyzing an Android application, we often end up playing with the Smali intermediate representation... Way more human readable than the binary DEX code itself, but still not that user friendly. This blog post gives some guidelines on how to read Smali, and start writing you own Smali code!

A quick introduction to Android Emuroot, a Python script that allows to get root privileges on the fly on an Android Virtual Device (AVD). It explains the reverse engineering steps needed for the script to work with recent AVDs and provides a preview of specific Linux kernel structures in memory.