Category Archives: Exploits

HTB Archetype

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So I’m going to probably post my HackTheBox solutions here so I have somewhere I can look at them in case I’m not home etc.. I sometimes refer back to my notes when I am with clients so I don’t have to reinvent the wheel to solve the same problem, so it would be nice to have them accessible anywhere.

I am going to start off with Archetype, which is an intro box for beginners that I did with my local tech group to help walk them through learning the concepts behind penetration testing.

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Office DDEAUTO attacks

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Sensepost posted 10 days ago about a vulnerability which can trigger command execution, without use of macros, when someone opens a specially crafted Office document. Although a little bit of social-engineering needs to come in play for the victim to click ‘yes’ to the first 2 of 3 message boxes, most end-users are easily tricked. They found that by abusing the parameters of the DDEAUTO function that they could use powershell to download malicious payloads remotely. DDE is a legacy Inter-Process Communication (IPC) mechanism dating back to 1987, which establishes a dynamic data exchange (DDE) link with a document created in another Microsoft Windows-based program, (new information becomes available in a linked document, a DDE field inserts new information when you update the field). SensePost discovered that instead of specifying an application like Excel, an attacker can specify arbitrary parameters of another application as the first parameter, and quoted arguments as the second parameter (which cannot exceed 255 bytes). Continue reading →

Exploiting with EternalRomance using Metasploit installed inside Win10 WSL

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This post will have a few sections. We will get some general information of the ETERNALROMANCE exploit, learn how to install WSL on Win10 Creators Update, along with Metasploit. As a bonus I will show how to do this on Kali, and show a few different additional tricks to download payloads to the target machine. Continue reading →

Equihax

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In July, CVE-2017-9805, was reserved for the Apache Struts RCE vulnerability in the REST plugin. Apache Struts 2.5 through 2.5.12 that are using REST plugin are vulnerable to this attack. It had an initial disclosure on 7/17/2017, and a patch was released recently on 9/5/2017, with Apache updating Struts to version 2.5.13 was released. The flaw exists in using the Struts REST plugin with XStream handler to handle XML payloads. If exploited correctly, it allows a remote unauthenticated attacker to run malicious code on the application server to either take over the machine or launch further attacks from it. The problem occurs in XStreamHandler’s toObject () method, which does not impose any restrictions on the incoming value when using XStream deserialization into an object. lgtm has in in depth article along with a press release from Apache Foundation. The company Lgtm, who discovered the CVE-2017-9805 vulnerability, had warned that at least 65 percent of Fortune 100 companies use Struts, and they could all be exposed to remote attacks due to this vulnerability. Continue reading →

CVE-2017-0213 – Windows COM EoP

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Wrote another blog post for Milton Security about details of a vulnerability that James Forshaw of Google Project Zero found in January, that exploits a bug in Windows COM Aggregate Marshaler. An attacker can use this bug to elevate privileges on Windows machines.

Microsoft had 90 days to patch, which they have with last month’s security updates. The post includes a proof of concept code for 32 and 64 bit versions of Windows from Win7-10 and Server 2k8-2k16.
https://www.miltonsecurity.com/company/blog/cve-2017-0213-windows-com-privilege-escalation-vulnerability

EternalRed – CVE-2017-7494

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I wrote another post for the Milton Security blog on the CVE-2017-7494 Samba exploit, which affects Linux machines running Samba 3.5.0 – 4.5.4/4.5.10/4.4.14. This also includes NAS devices that many people do not patch regularly. In the blog post i talked about what Samba is and how it has been vulnerable for the last 7 years due to this bug. I also go over on how to test/ exploit your machine to see if you’re vulnerable. I also cover some mitigations, the maintainers of the Samba project have provided a patch so I would advise you install it as soon as possible, some NAS firmware upgrades have been available from Netgear and Synology already. Continue reading →

M17-010 EternalBlue

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A few weeks ago ShadowBrokers released a dump of NSA/EquationGroup tools used to exploit various machines that they previously tried to auction off unsuccessfully. One of the exploits was for Windows SMB RCE which allowed an unauthenticated attacker to gain System-level privileges on target machines remotely by sending a specially crafted packet to a targeted SMB server. Microsoft quietly patched this as MS17-010 a month before, in March, before the dump was even made public. Although the dump was supposedly stolen around 2013, this affected Windows machines from Win2k up to Win2k16. Most reliable targets were Win7 and Win2k8 R2.


One exploit was codenamed EternalBlue. Everyone quickly jumped on the tools and found that along with ExternalBlue there was another tool called DoublePulsar that allowed you to inject shellcode or DLLs into the victim target after they were exploited with EternalBlue, it sets up the APC call with some user mode shellcode that would perform the DLL load avoiding use of the standard LoadLibrary call. DOUBLEPULSAR implements a loader that can load almost any DLL. A few people had writeups [1] & [2] on how to successfully install the tools in Windows and on Wine on Linux using older versions of Python. It was also discovered you could replace the DoublePulsar .dll with something like Meterpreter or Empire to have more control over your target with the need to use the NSA-provided GUI tool called FuzzBunch. Continue reading →

ms16-032 one-liners

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I was playing around with box in my lab earlier testing out ms16-032, which is a privilege escalation exploit that got patched earlier this year that affected windows versions vista,2k8,7,8.1,2k12, and 10. It was a bug in the Secondary Logon service that allows you to leak a handle opened in a privileged process into a lower privileged process. @FuzzySec made a powershell script to exploit this that works really well, but I wanted to make it into as easy 1-liner to paste into a cmd prompt. Continue reading →