리버스 허트브레드 테스팅

I wanted to know if the tools/software I execute regularly are vulnerable to scraping my system memory.  Now the reverse heartbleed scenario is very possible, but the likelihood seems to be much more of a non-issue.  

Seeing is still believing in my book.  So I set out to see what the interweb world was doing to test this out.  There are some very reputable services/organizations out there offering up a fresh url to the reverse heartbleed and others offering to 'test' a given url.   These are a black box.  Trust is hard to earn at times, especially when you are dealing with an exploit like this one.  I wanted to see source code, or at least pseudocode so I could craft my own.  I found a script out there called Pacemaker [1] that was written and provided by Peter Wu.  I liked it because it was transparent, simple, and it can be used exclusively under my control (the ultimate first step of developing trust).

So simple, I was able to review it for harm and function, and cut and paste it into vi.  Escape, write, quit, and I was off and running.   Basically it works like a simple webserver, very simple.  The script is executed and listens on port 4433.  You point your client software at it with a localhost url and the server script reports on STDOUT what it finds.  

I did not have any vulnerable client software readily available to give a whirl, but I did try all my curl and wget installs that I use regularly.   I also hit it with Chrome and Safari to see the error messages.

Here is what I tested with it.

wget 1.11.4:  

Connection from: 10.0.0.11:60401

Unable to check for vulnerability: SSL 2.0 clients cannot be tested

 

curl 7.30.0 (x86_64-apple-darwin13.0) libcurl/7.30.0 SecureTransport zlib/1.2.5:

 

Connection from: 10.0.0.11:60418

Got Alert, level=Fatal, description=40

Not vulnerable! (Heartbeats disabled or not OpenSSL)

 

curl 7.24.0 (x86_64-apple-darwin12.0) libcurl/7.24.0 OpenSSL/0.9.8y zlib/1.2.5:

 

Connection from: 127.0.0.1:59451

Possibly not vulnerable

 

Chrome 34.0.1847.116:

Connection from: 127.0.0.1:59490

Got Alert, level=Fatal, description=47

Not vulnerable! (Heartbeats disabled or not OpenSSL)

 

I am interested in seeing more output from known vulnerable client software.  Feel free to give this a ride and share your results.  If I get a chance to spin out a new VM with some vulnerable OpenSSL on it today, then I will share my experiences too.

 

[1]   https://github.com/Lekensteyn/pacemaker

-Kevin
--
ISC Handler on Duty