rofl0r / rofl0r/proxychains-ng

proxychains+nmap/telnet shows that all ports open

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Dominant language
C
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Description

When I use nmap or telnet with procxychains4, it seems that all ports open,just like this:

proxychains4 -q nmap -n 202...* | head
Starting Nmap 6.40 ( http://nmap.org ) at 2015-10-16 22:26 CST
Nmap scan report for 202...*
Host is up (0.00034s latency).
PORT STATE SERVICE
1/tcp open tcpmux
3/tcp open compressnet
4/tcp open unknown
6/tcp open unknown
7/tcp open echo

proxychains4 -q telnet 202...* 7777
Trying 202......
Connected to 202.
...
Escape character is '^]'.

Why do such things happen?

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the reported behavior with proxychains4, nmap, and telnet using the commands and proxy setup from the issue. Trace how proxied connection results are reported and determine why unreachable ports appear open; done means identifying the cause and confirming corrected port states with both commands.

Written by the indexing model from the issue text.

Assessment

Tech stack
c
Domain
networking
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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