Research Blog

Vendor: OpenJDK Project Vendor URL: https://openjdk.java.net Versions affected: 8-17+ (and likely earlier versions) Systems Affected: All supported systems Author: Jeff Dileo Advisory URL / CVE Identifier: TBD Risk: Low (implicit data validation bypass) Summary The private static InetAddress::getAllByName(String,InetAddress) method is used internally and by the public static InetAddress::getAllByName(String) to resolve host or IP strings […]

tl;dr Grab the release binary from our repo and have fun. Also, happy new year; 2021 couldn’t end soon enough. Background A while back, I was asked by one of my coworkers on the PSC team about ways in which to make their custom credit card data scanner cloud native to assess Kubernetes clusters. While […]

We released ruby-trace back in August to coincide with my DEF CON 29 talk on it and parasitic tracing in general. Back then, it supported (c)Ruby 2.6 through 3.0. A few days ago, Ruby 3.1 was released. We have updated ruby-trace to add support for Ruby 3.1 and reorganized our test suite to validate our […]

Background Java Virtual Machines (JVMs) provide a number of mechanisms to inspect and modify the Java applications and the runtime they stand on. These include Java agents, JARs that are capable of modifying Java class files at runtime; and JVMTI agents, native libraries that can perform deep hooking into the innards of the JVM itself. […]

tl;dr Run our new tool by adding -javaagent:log4j-jndi-be-gone-1.0.0-standalone.jar to all of your JVM Java stuff to stop log4j from loading classes remotely over LDAP. This will prevent malicious inputs from triggering the “Log4Shell” vulnerability and gaining remote code execution on your systems. . In this post, we first offer some context on the vulnerability, the […]

Having been in the game of auditing kprobe-based tracers for the past couple of years, and in light of this upcoming DEF CON on eBPF tracer race conditions (which you should go watch) being given by a friend of mine from the NYU(-Poly) (OSIR)IS(IS) lab, I figured I would wax poetic on some of the […]

Recently, I was working on weaponizing a particular bug with a colleague. For reasons unfathomable to me, we’ve been implementing our exploit in Ruby. As part of this, we wrote a rinky-dink port scanner that attempts to find instances of the service on a given host because it has a propensity to pick random ports […]

This post is a technical discussion of the underlying vulnerability of CVE-2020-15257, and how it can be exploited. Our technical advisory on this issue is available here, but this post goes much further into the process that led to finding the issue, the practicalities of exploiting the vulnerability itself, various complications around fixing the issue, […]

tl;dr eBPF (extended Berkeley Packet Filter) is slowly taking over as a programmatic way for (generally privileged) users to invoke Linux kernel APIs and performantly execute semi-arbitrary code without having to load it from a custom kernel module. eBPF is a general means to load memory safe restricted code that reduces the risk of crashes, […]