which version of eSafe are we talking about? 3 or 4 ? On Sat, 2004-07-24 at 14:27, 3APA3A wrote: > Dear Hugo van der Kooij, > > --Friday, July 23, 2004, 10:21:22 PM, you wrote to bugtraq@xxxxxxxxxxxxxxxxx: > > HvdK> Both as NitroEngine or CVP server they will push as much of 80% to the > HvdK> end-user before they stop a virus. Then they rely on the adding of the > HvdK> exact URL so that URL can be blocked in all next requests. > > It depends on how antiviral check is actually implemented. If connection > is broken immediately after signature is detected - there is no way to > download infected file, because signature will not pass to client and > client will not be able to use "Range:" header to resume partially > downloaded file. > > If antiviral filter checks data _after_ all data received from client > with 20% buffering yes, it's possible to bypass this check for HTTP, > because there is no way (at least for HTTP/1.0 and FTP) to indicate > error to client and make him to delete partially downloaded data. > > You can check it, by sending EICAR with some additional data: if you can > find EICAR signature on the client after connection is broken by > antiviral filter you can bypass it's protection. >
