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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
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Kevin Shortt 85 Posts ISC Handler Apr 13th 2014 |
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Apr 13th 2014 7 years ago |
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The client software scene is much more diverse....
While you have some exceptions such as curl/wget, VPN clients, perhaps some FTP LDAP and E-mail clients, which may use OpenSSL. Most of the major web browsers do not. Firefox, Chrome, OpenOffice, Evolution, Pidgin, 389 directory services, various Java products = LibNSS Internet Explorer = Windows CryptoAPI Opera = [none of the above] |
Mysid 146 Posts |
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Apr 13th 2014 7 years ago |
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I have try directly with openssl client like:
openssl s_client -connect 127.0.0.1:4433 but imho don't works ! |
Mysid 1 Posts |
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Apr 14th 2014 7 years ago |
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Did you get the following (or something like it) as a response to 'openssl s_client -connect 127.0.0.1:4433' ?
CONNECTED(00000003) 58872:error:140790E5:SSL routines:SSL23_WRITE:ssl handshake /SourceCache/OpenSSL098/OpenSSL098-47.2/src/ssl/…: |
Kevin Shortt 85 Posts ISC Handler |
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Apr 14th 2014 7 years ago |
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Got a hit within Cygwin.
curl 7.29.0 (i686-pc-cygwin) libcurl/7.29.0 OpenSSL/1.0.1e zlib/1.2.8 libidn/1.26 libssh2/1.4.2 Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp scp sftp smtp smtps telnet tftp Features: Debug GSS-Negotiate IDN IPv6 Largefile NTLM NTLM_WB SSL libz TLS-SRP Metalink |
Kevin Shortt 1 Posts |
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Apr 18th 2014 7 years ago |
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