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220.127.116.11 Packet Sniffing
Since vanilla FTP transmits in
clear text, using a packet sniffer to see the data as well as user/password
information is relatively easy to do. In 2.5.1 we mentioned performing
file transfers over SSL or SSH2. Another version of encrypted FTP uses
the freely available BlowFish encryption algorithm (448-bit Encryption
and can be found for free in the footnote230.
With FTP access, a malicious user can upload a virus, or exploit a web server flaw like a buffer overflow, and cause a Denial of Service to legitimate users, or even gain unauthorized access to the server.
Another security vulnerability in FTP is that unless a technology like S/FTP is used, data and user/password information are transferred in clear text form, and can easily be sniffed from the network or even altered during transfer.
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CertiGuide for Security+ (http://www.CertiGuide.com/secplus/) on CertiGuide.com
Version 1.0 - Version Date: November 15, 2004
Adapted with permission from a work created by Tcat Houser et al.
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