Date: Sat, 19 Dec 1998 17:19:34 +0200 From: Philip Stoev Reply-To: Bugtraq List To: BUGTRAQ@netspace.org Subject: ValueClick CGI Vulnerability [ The following text is in the "KOI8-R" character set. ] [ Your display is set for the "US-ASCII" character set. ] [ Some characters may be displayed incorrectly. ] The ValueClick Online Advertising agency web interface has a CGI vulnerability that allows easy username/password capture without using sniffing software. When you go to ValueClick home page (www.valueclick.com) and log on, your username and password are embedded in the URL and if you subsequently leave their site and go somewhere else, this URL will end up in this site's HTTP refferer log which I beleive is a serious fault because one can easily not just garble with your account, but also redirect any cheques you are about to receive from ValueClick to himself. ValueClick was notified several months ago and they responded they will substitute GET with POST in their CGI, but they have taken no such action. Sincerely, Philip Stoev -- Free SAT & TOEFL preparation softwate @ http://studywiz.hypermart.net This message was sent by Philip Stoev (philip@einet.bg) tel: (359 2) 715949, 9549488 fax: (359 2) 544669 ------------------------------------------------------------------------- Date: Sat, 19 Dec 1998 19:57:20 -0500 From: "Ellen (ValueClick)" Reply-To: Bugtraq List To: BUGTRAQ@netspace.org Subject: ValueClick Hi, Please allow me to introduce myself. My name is Ellen O'Rourke and I am Host Member Manager for ValueClick. I would like to refer to the letter you wrote BUGTRAQ@NETSPACE.ORG regarding "ValueClcik vernerability." Let me explain: If the user decides to go to another site after they are logged in, either via a bookmark or typing in a url, the referring url will be blank. If we had a link to the outside, the referring url would contain the logged in user's username and password. The links that we do have to the outside, such as on the exclude banners page where a user can click on a banner to view the advertiser's site, have the referring url stripped off to protect the host's login info. If you have evidence that contradicts this, we would very much appreciate your advising us. We appreciate your interest in ValueClick. --------------------------------------------------------- Ellen O'Rourke Member Site Manager ellen@valueclick.com ValueClick The pay-for-results advertising network! ValueClick Banner Ad Network http://www.valueclick.com --------------------------------------------------------- ------------------------------------------------------------------------- Date: Sat, 19 Dec 1998 18:47:56 -0800 From: Trev Reply-To: Bugtraq List To: BUGTRAQ@netspace.org Subject: Re: ValueClick Hi Ellen Perhaps you haven't heard of the Brumleve cache bug, or the other various ways remote websites can gather the information in your browser's history. It is so simple to use POST instead of GET... I don't see why you want to take the chance of it being intercepted. There are a number of ways that requested URLs can be logged etc. Trev