An intruder can send certain kinds of data to services that he is not ordinarily able to reach. By crafting the data such that it is redirected through any program the victim uses to render the malicious HTML, the intruder is able send that data to any services that the victim can send data to. The malicious HTML can be embedded in documents such as an email message, web page, rich-text log or newsgroup posting.
This vulnerability has been called "cross-protocol scripting."
An intruder may be able to use this vulnerability to send mail (Spam), post News, get or send files from or to an FTP server, or send data to an HTTP server. It may even be possible to exploit a vulnerability in one of these services through this problem, though we are not certain of that at this time. For example, an intruder may be able to exploit this problem as a means of attacking a vulnerable web server that would ordinarily be protected by a firewall. Additionally, it may be possible for an intruder to cause denial-of-service conditions within the network by sending unexpected data to network services. This unexpected data may crash or hang the services receiving the data.
Upgrade your application according to your manufacturer's recommendations, if any. Additionally, do not rely solely on firewalls to provide a guarantee that an intruder can not reach a service. Keep internal systems up to date with respect to patches and workarounds.
Microsoft Corporation Affected
Netscape Communications Corporation Affected
The SCO Group (SCO Linux) Affected
FreeBSD, Inc. Not Affected
Apple Computer, Inc. Unknown
Berkeley Software Design, Inc. Unknown
Cray Inc. Unknown
Hewlett-Packard Company Unknown
MiT Kerberos Development Team Unknown
NEC Corporation Unknown
Red Hat, Inc. Unknown
Sequent Computer Systems, Inc. Unknown
Siemens Nixdorf Unknown
Sony Corporation Unknown
Sun Microsystems, Inc. Unknown
The CERT/CC thanks Jochen Topf
This document was written by Ian A. Finlay and Shawn V. Hernan.
|Date First Published:||2001-08-16|
|Date Last Updated:||2008-02-05 00:41 UTC|