Apache Struts Exploit

This week's update includes an exploit for a pretty recent vulnerability in Apache Struts, thanks to community contributor Richard @Console Hicks. The struts_include_param module exercises the vulnerability described at OSVDB 93645, disclosed on May 23, 2013, a bare two weeks ago, and originally discovered by Eric Kobrin and Douglad Rodrigues.

The reason why I bring this up is not just because it's a solid exploit for a recent vulnerability (it is), but also because it illustrates, to a small extent, the Metasploit philosophy of disclosing working, tested exploits pretty much as soon as vulnerabilities are made public.

If you are bothered by this stance, then maybe it's time to drag out a dusty old security meme: Defense in Depth. I know for sure there are IT operations folks out there who believe that there is absolutely nothing they can do in the face of zero-day vulnerabilities. This is a horrible, horrible place to be. The fact is, there are volumes and volumes written on defense in depth: you can segment your network, instrument your servers, keep an eye on egress rules, and generally make life a huge hassle for would-be attackers armed with zero (or 14, or 30) day vulnerabilities that you haven't patched against yet.

I'm heartened that Google appears to have taken a similiar stance on this, with their announced policy of disclosing active, in-the-wild exploits in the interest of public safety. An Internet giant like Google taking an anti-secrecy stance like this is pretty powerful, and I'm looking forward to the next few weeks of vulnerability disclosures from them.

Android Meterpreter

Once, a few weeks back, a fellow named timwr popped into the Metasploit IRC channel on Freenode and complained, rather rudely I might add, "How come there's no Android Meterpreter?" Egypt immediately responded with something along the lines of, "because you haven't written it yet." That, my friends, is how new ports of Meterpreter are made.

Timwr, mihi, and Egypt got together over the next several weeks, and as of May 28 or so, we now have a pretty decent Meterpreter app for Android. Expect a much more whiz-bang blog post on this soon, but in the meantime, it's pretty fun to mess around with it now. We don't have mcuh in the way of Android exploits right now, of course, but that brings me to another topic.

New Payloads

This week's update also includes new payloads for ARM and 64-bit Windows. We've three new payloads, all from community contributor @dcbz32, to create reverse TCP and reverse HTTPS connections, as well as a simple shell payload. Hooray, our ARM support is getting more robust all the time; now if only we could convince people to start writing up decent Android and embedded system exploits...

In addition, we also have a 64-bit Windows payload for reverse HTTPS, from community contributor agix. This has been a long standing feature request, because while in most cases, 32-bit payloads work just fine on 64-bit platforms, this isn't the case 100% of the time. While this payload works like a champ on Windows 7 and related platforms, it most notably is not supported for Windows 8 targets. Something funny is going on in Win8-land specifically, and it's proving squirrelly to nail down. So, good job to Microsoft for making post-exploit development a little bit harder on their latest platform (: . If you happen to have expertise in this area, we'd love to get your input on putting something solid together for Win8 reverse HTTPS connections as shellcode; ideally, we can end up with one payload for both 64-bit platforms.

New Modules

We've five new modules this week, including the Apache Struts exploit. Check 'em below.

Availability

If you're new to Metasploit, you can get started by downloading Metasploit for Linux or Windows. If you're already tracking the bleeding-edge of Metasploit development, then these modules are but an msfupdate command away. For readers who prefer the packaged updates for Metasploit Community and Metasploit Pro, you'll be able to install the new hotness today when you check for updates through the Software Updates menu under Administration.

For additional details on what's changed and what's current, please see Brandont's most excellent release notes.