Hello Bugtraq! I want to warn you about security vulnerability in different browsers. ----------------------------- Advisory: DoS vulnerabilities in Firefox, Internet Explorer, Chrome and Opera ----------------------------- URL: http://websecurity.com.ua/4238/ ----------------------------- Affected products: Mozilla Firefox, Internet Explorer 6, Internet Explorer 8, Google Chrome, Opera. ----------------------------- Timeline: 26.05.2010 - found vulnerabilities. 26.05.2010 - informed developers: Mozilla, Microsoft, Google and Opera. Susan Bradley must be happy :-). 27.05.2010 - disclosed at my site. ----------------------------- Details: After publication of previous vulnerabilities in different browsers, I continued my researches and found many new vulnerabilities in browsers, which I called by general name DoS via protocol handlers, to which belonged and previous DoS attack via mailto handler. Now I'm informing about DoS in different browsers via protocols news and nntp. These Denial of Service vulnerabilities belongs to type (http://websecurity.com.ua/2550/) blocking DoS and resources consumption DoS. These attacks can be conducted as with using JS, as without it (via creating of page with large quantity of iframes). DoS: http://websecurity.com.ua/uploads/2010/Firefox,%20IE,%20Chrome%20&%20Ope ra%20DoS%20Exploit2.html This exploit for news protocol works in Mozilla Firefox 3.0.19 (and besides previous versions, it must work in 3.5.x and 3.6.x), Internet Explorer 6 (6.0.2900.2180), Internet Explorer 8 (8.0.7600.16385), Google Chrome 1.0.154.48 and Opera 9.52. In all mentioned browsers occurs blocking and overloading of the system from starting of Opera, which appeared as news-client at my computer, and IE8 crashes (at computer without Opera). And in Opera the attack is going without blocking, only resources consumption (more slowly then in other browsers). http://websecurity.com.ua/uploads/2010/Firefox,%20IE%20&%20Opera%20DoS%2 0Exploit.html This exploit for nntp protocol works in Mozilla Firefox 3.0.19 (and besides previous versions, it must work in 3.5.x and 3.6.x), Internet Explorer 6 (6.0.2900.2180) and Opera 9.52. In all mentioned browsers occurs blocking and overloading of the system from starting of Opera, which appeared as nntp-client at my computer. In IE8 the attack didn't work - possibly because that at that computer there was no nntp-client, Opera in particular. And in Opera the attack is going without blocking, only resources consumption (more slowly then in other browsers). Best wishes & regards, MustLive Administrator of Websecurity web site http://websecurity.com.ua