Penetration Testing mailing list archives
Re: Remote Desktop/Term. Serv information leakage
From: Eric Smith <defcon47 () yahoo com>
Date: Fri, 1 Jul 2005 09:15:47 -0700 (PDT)
I tried this method with several exe files and it doesnt work on the remote side. This doesnt suprise me since you are talking about taking a binary file (exe) and fooling the OS into believing the contents are Ascii (txt). When you copy what is supposed to be ASCII and try to convert it back to a binary form on the remote side by renaming, the exe is corrupt. At most, the only information leakage that you are referring to would be documents that could be copied and pasted over a RDP session. However, there are many ways of transferring ascii, so this is a low risk at most. --- kuffya () gmail com wrote:
Hi list, One of our recent clients has a seperate 'isolated' network where they keep sensitive material. This network is not connected to the internet, is not physically accessible and you can only connect to it using remote desktop. They asked us to test if the isolated network was adequately protected. Here's what I discovered: When you start a Rem Desktop session from the main network to the isolated one you can actually copy and paste stuff across...this is only true for text not for complete files, and seems to be by design. What is more worrisome is that you can even copy across executables doing simple tricks such as 1)download an executable 2)change extension to .txt 3) copy (the text version) across to a notepad. 4)change it back to .exe So literally we have a significant leakage over here, introducing threats to the isolated network. I am posting this to ask your opinion on how this could be mitigated......I think that Remote Desktop is not possible to configure securely since it's not designed as such...and hence it transfers across anything it receives , be it mouse movements or copied & pasted text... So I was trying to think what would be the best solution, without spending a fortune on a 'secure' commercial solution, that is. Maybe something like SSH tunneling then Rem. Desktop or VNC or what? And do you think this 'bug' is something investigating any further? Is it something you people knew of? Thanks a lot.
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Current thread:
- Remote Desktop/Term. Serv information leakage kuffya (Jul 01)
- Re: Remote Desktop/Term. Serv information leakage Joachim Schipper (Jul 01)
- Re: Remote Desktop/Term. Serv information leakage Eric Smith (Jul 01)
- Re: Remote Desktop/Term. Serv information leakage Kyle Maxwell (Jul 01)
- Re: Remote Desktop/Term. Serv information leakage Terry Vernon (Jul 01)
- Re: Remote Desktop/Term. Serv information leakage Joachim Schipper (Jul 01)
- RE: Remote Desktop/Term. Serv information leakage Paul Fields (Jul 01)
- Re: Remote Desktop/Term. Serv information leakage Thor (Hammer of God) (Jul 01)
- <Possible follow-ups>
- RE: Remote Desktop/Term. Serv information leakage Andre Protas (Jul 01)
- RE: Remote Desktop/Term. Serv information leakage Ha, Jason (Jul 02)
- Re: Remote Desktop/Term. Serv Information leakage kuffya (Jul 02)
- RE: Remote Desktop/Term. Serv Information leakage Paul Fields (Jul 05)
- RE: Remote Desktop/Term. Serv information leakage Salvador.Manaois (Jul 04)
(Thread continues...)