Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Nmap with -sT parameter hangs on 7.94 #2672

Closed
randybock opened this issue Jun 23, 2023 · 3 comments
Closed

Nmap with -sT parameter hangs on 7.94 #2672

randybock opened this issue Jun 23, 2023 · 3 comments
Labels
Nmap

Comments

@randybock
Copy link

randybock commented Jun 23, 2023 •
edited

Describe the bug
When running nmap with the -sT parameter, the scan never completes. Keeps just saying 0.00% done. Have let it run for more than an hour.

To Reproduce
Run nmap with -sT parameter. Runs fine when the parameter is removed

Expected behavior
I expect it to run within a few seconds. The same command worked perfectly in 7.93.

Version info (please complete the following information):

  • OS: Windows server 2012
  • Output of nmap --version:
  • Nmap version 7.94 ( https://nmap.org )
    Platform: i686-pc-windows-windows
    Compiled with: nmap-liblua-5.4.4 openssl-3.0.8 nmap-libssh2-1.10.0 nmap-libz-1.2.13 nmap-libpcre-7.6 Npcap-1.75 nmap-libdnet-1.12 ipv6
    Compiled without:
    Available nsock engines: iocp poll select
  • Output of nmap --iflist
    Starting Nmap 7.94 ( https://nmap.org ) at 2023-06-23 16:31 Central Daylight Time
    INTERFACES
    DEV (SHORT) IP/MASK TYPE UP MTU MAC
    eth0 (eth0) fe80::5b7f:b21:7155:7e30/64 ethernet down 1500 3C:EC:EF:B2:54:42
    eth1 (eth1) fe80::7561:3224:ade4:5230/64 ethernet up 1500 AC:1F:6B:87:66:D3
    eth1 (eth1) 10.2.1.52/24 ethernet up 1500 AC:1F:6B:87:66:D3
    lo0 (lo0) ::1/128 loopback up -1
    lo0 (lo0) 127.0.0.1/8 loopback up -1

DEV WINDEVICE
eth0 \Device\NPF_{6BCFDEC4-A31F-4CE4-82B1-56C4B1C2F3D5}
eth1 \Device\NPF_{E645965B-E8A9-46EF-BE19-82BAB3D8EBC7}
eth1 \Device\NPF_{E645965B-E8A9-46EF-BE19-82BAB3D8EBC7}
lo0 \Device\NPF_Loopback
lo0 \Device\NPF_Loopback
\Device\NPF_{984DE894-CEB8-4667-A0A9-02CD6637677A}
\Device\NPF_{9E8736B7-6794-496A-98B2-1F20B959622A}
\Device\NPF_{09D6E3C2-A2FB-44A4-A46B-F3F614AF90BE}

ROUTES
DST/MASK DEV METRIC GATEWAY
255.255.255.255/32 eth1 261
255.255.255.255/32 eth1 281
10.2.1.52/32 eth1 281
10.2.1.255/32 eth1 281
127.255.255.255/32 lo0 331
127.0.0.1/32 lo0 331
255.255.255.255/32 lo0 331
10.2.1.0/24 eth1 281
127.0.0.0/8 lo0 331
224.0.0.0/4 eth1 261
224.0.0.0/4 eth1 281
224.0.0.0/4 lo0 331
0.0.0.0/0 eth1 281 10.2.1.31
fe80::5b7f:b21:7155:7e30/128 eth0 261
fe80::7561:3224:ade4:5230/128 eth1 281
::1/128 lo0 331
fe80::/64 eth0 261
fe80::/64 eth1 281
ff00::/8 eth0 261
ff00::/8 eth1 281
ff00::/8 lo0 331
Additional context
None
@randybock randybock added the Nmap label Jun 23, 2023
@randybock randybock changed the title Nmap with -sT parameter hangs Nmap with -sT parameter hangs on 9.94 Jun 23, 2023
@TheProdigyLeague

This comment was marked as off-topic.

Sign in to view
@dksslq
Copy link

dksslq commented Jun 26, 2023 •
edited

Default parallelism is 0, using --max-parallelism or nmap -sT xx hangs. its a bug specific to nmap windows-edition. check:

nmap/scan_engine_connect.cc

Line 119 in d131a09

maxSocketsAllowed = MIN(maxSocketsAllowed, FD_SETSIZE - 1);

@randybock randybock changed the title Nmap with -sT parameter hangs on 9.94 Nmap with -sT parameter hangs on 7.94 Aug 2, 2023
@dmiller-nmap
Copy link

Thanks for reporting this. This is a known issue with Nmap 7.94 on Windows which has been fixed in preparation for the next release. The fix is in commit 0890822

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees
No one assigned
Labels
Nmap
Projects
None yet
Milestone
No milestone
Development

No branches or pull requests
4 participants
@dmiller-nmap @dksslq @randybock @TheProdigyLeague