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Test ID:1.3.6.1.4.1.25623.1.0.11367
Category:Useless services
Title:Check for discard Service (TCP)
Summary:The remote host is running a 'discard' service. This service; typically sets up a listening socket and will ignore all the data which it receives.;; This service is unused these days, so it is advised that you disable it.
Description:Summary:
The remote host is running a 'discard' service. This service
typically sets up a listening socket and will ignore all the data which it receives.

This service is unused these days, so it is advised that you disable it.

Solution:
- Under Unix systems, comment out the 'discard' line in
/etc/inetd.conf and restart the inetd process

- Under Windows systems, set the following registry key to 0:

HKLM\System\CurrentControlSet\Services\SimpTCP\Parameters\EnableTcpDiscard

Then launch cmd.exe and type:

net stop simptcp

net start simptcp

To restart the service.

Notes:

Some firewall devices are known to discard packets on the checked port 9/tcp or mimic such a
service via other means. Scanning through a firewall should be generally avoided (Please see
references).

If the target was scanned through a firewall and it was determined / has been verified that no
such service is running on the target please either:

- create an override for this result

- configure the firewall in a way that port 9/tcp is not reported as being open during the port
scanning phase / it is not allowed to open a TCP connection to port 9/tcp on the target

CVSS Score:
10.0

CVSS Vector:
AV:N/AC:L/Au:N/C:C/I:C/A:C

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-1999-0636
https://www.cve.org/CVERecord?id=CVE-1999-0636
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