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Nessus Cheat Sheet

Table of Contents

Data directories

Linux

/opt/nessus/var/nessus

macOS

/Library/Nessus/run/var/nessus

Windows

C:\ProgramData\Tenable\Nessus\nessus

Binary directories and utilities

Linux

/opt/nessus/sbin
/opt/nessus/bin

macOS

/Library/Nessus/run/sbin
/Library/Nessus/run/bin

Windows

C:\Program Files\Tenable\Nessus
C:\Program Files (x86)\Tenable\Nessus

  • nessusd - e.g. to recompile plugins

  • nessuscli - e.g. to configure, manage and update Nessus (docs)

  • nasl - e.g. to test, run, sign plugins

Logs directories and files

Linux

/opt/nessus/var/nessus/logs

macOS

/Library/Nessus/run/var/nessus/logs

Windows

C:\ProgramData\Tenable\Nessus\nessus\logs

  • nessusd.dump — Nessus dump log file used for debugging output.

  • nessusd.messages — Nessus scanner log.

  • www_server.log — Nessus web server log.

  • backend.log — Nessus backend log.

  • nessuscli.log — Nessus CLI log.

Plugin directories and files

Linux

/opt/nessus/lib/nessus/plugins

macOS

/Library/Nessus/run/lib/nessus/plugins

Windows

C:\ProgramData\Tenable\Nessus\nessus\plugins

  • *.nasl - plugins with readable source code

  • *.nbin - compiled plugins

  • *.inc - include libraries

Search in plugin content

cd /opt/nessus/lib/nessus/plugins
grep -rl script_id.19506 . (1)

  1. Due to big number of plugins you need to use -r parameter to recursively search in plugins directory (i.e., force grep to behave as rgrep).

Advanced Settings

cd /opt/nessus/sbin
nessuscli fix --list
nessuscli fix --get setting_name
nessuscli fix --set setting_name=<value>

API

https://localhost:8834/api (1)
https://localhost:8834/server/status (2)
https://localhost:8834/server/properties (3)

  1. Access Nessus API documentation.

  2. Check Nessus service status.

  3. Check Nessus service version.

Plugin Feed

Check latest available plugins feed

curl https://plugins.nessus.org/v2/plugins.php
202201311213

Check Plugin Feed in Nessus

Login to Nessus, go to Settings > About > check Plugin Set, or on OS level:

cd /opt/nessus/lib/nessus/plugins
head -1 plugin_feed_info.inc
PLUGIN_SET = "202201311213";

Good practices

When you run scan:

  • Make sure that you have latest feed.

  • Perform scan with credentials. (docs)

When you analyze scan results:

  • Use Audit Trail to make sure why plugin did not provide result.

  • Check Knowledge Base to find more details.

Additional resources