Mozilla Foundation Security Advisory 2007-11

Mozilla Foundation Security Advisory 2007-11
Title: FTP PASV port-scanning
Impact: Low
Announced: March 20, 2007
Reporter: [email protected]
Products: Firefox, SeaMonkey

Fixed in: Firefox 2.0.0.3
Firefox 1.5.0.11
Description
The FTP protocol includes the PASV (passive) command which is used by Firefox to request an alternate data port. The specification of the FTP protocol allows the server response to include an alternate server address as well, although this is rarely used in practice.

[email protected] reported that a malicious web page hosted on a specially-coded FTP server could use this feature to perform a rudimentary port-scan of machines inside the firewall of the victim. By itself this causes no harm, but information about an internal network may be useful to an attacker should there be other vulnerabilities present on the network.

Mozilla clients will now ignore the alternate server address.
References
Manipulating FTP Clients Using The PASV Command [bindshell.net]
RFC 959: File Transfer Protocol
https://bugzilla.mozilla.org/show_bug.cgi?id=370559

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