FTP bounce attack
Open-knowledge reference entry
FTP bounce attack is an exploit of the FTP protocol whereby an attacker is able to use the PORT command to request access to ports indirectly through the use of the victim machine, which serves as a proxy for the request, similar to an Open mail relay using SMTP.
This technique can be used to port scan hosts discreetly, and to potentially bypass a network's access-control list to access specific ports that the attacker cannot access through a direct connection, for example with the nmap port scanner.
Nearly all modern FTP server programs are configured by default to refuse PORT commands that would connect to any host but the originating host, thwarting FTP bounce attacks.
The public source identifies “FTP bounce attack” as open-knowledge reference entry. This brief keeps that definition visible, then builds a research path around bounce, attack and Open-knowledge.
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This entry incorporates text from “FTP bounce attack” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.