Signature Detail
Short Name |
FTP:EXPLOIT:ILLEGAL-PORT |
|---|---|
Severity |
High |
Recommended |
No |
Category |
FTP |
Release Date |
2003/04/22 |
Update Number |
1213 |
Supported Platforms |
di-5.3+, idp-4.0+, isg-3.0+, j-series-9.5+, mx-9.4+, srx-9.2+, srx-branch-9.4+, vsrx-12.1+ |
FTP: Request to Connect to Illegal Port
This protocol anomaly triggers when it detects an FTP PORT command/response to a PASV command ("227...") that specifies a reserved port number. This can indicate an attempt to make IDP or firewall open reserved ports.
Extended Description
PASV commands specifying a reserved port may be the result of misconfigured, or badly implemented, FTP clients. It could also indicate that an attacker is attempting an FTP Bounce Attack, or similar.
References