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Question of the day 08/09, Cybersecurity Edition

marcofabbri
Userlevel 7
Badge +13

Day 7. 

What is missing from a half-open scan?

  • FIN
  • SYN-ACK
  • ACK
  • SYN
  • RST
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Best answer by JMeixner 8 September 2022, 10:00

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Backups are like pizza, I love them. | Linkedin: @marco-fabbri-it

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JMeixner
Userlevel 7
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ACK (the last ACK)

Jochen (Joe) Meixner | Veeam Vanguard 2024 | Veeam Legend 2021 - 2023 | Veeam Certified Architect (VMCA) 2022 | Twitter: @JoMeix | BlueSky: @jmeixner.bsky.social
Link State
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  • SYN-ACK
Veeam: VMCA | VMCE | VMXP | Veeam Legend - Microsoft: MCITP | MCP | MCSA | 2008 R2 | 2012R2 | 2016 | MCSE Core Infrastructure | MCSE Cloud Platform - Azure: AZ900 | AZ104 - VMWare: VCP-DCV Vsphere 7.x - Cisco: CCNA (Expired)
Chris.Childerhose
Userlevel 7
Badge +20

ACK

Chris Childerhose - VMCA2022 | VMCE2023 | Veeam Vanguard 7* | Veeam Legend 3* | vExpert 5* | VCAP-DCV/VCP-DCV | Object First Ace | Cisco Champion | Twitter: @cchilderhose | Blog Site – https://just-virtualization.tech
marcofabbri
Userlevel 7
Badge +13

In an half-scan, what is missing is last ACK.

It’s used to avoid logging on scanned device by interrupting TCP handshake.

On nmap is “-sS” and it’s the default scan.

Backups are like pizza, I love them. | Linkedin: @marco-fabbri-it

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