Some attacks on web browsers consist in installing new toolbars on the browser of the user (which is just a small aspect of browser-hijacking.

My question: is installing (malicious) add-ons (via drive-by download attack) the only way to add new toolbars to browsers such as firefox, internet explorer and google chrome ?

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    Your title and body do not ask the same question. – Stephane Jul 5 '14 at 17:23
  • @Stephane Thank you for your remark, but for me i think i expressed the same idea (English is not my mother language, i learnt it by myself) – user45139 Jul 5 '14 at 17:26
  • I assume you mean aside from the user installing the toolbar him/herself. – Ben Feb 18 '16 at 19:01

Simple answer: No

Any attack which compromises your machine could add toolbars to your browser.

However, this is a very different type of attack, and to be honest, any attacker who has full control of your machine is likely to do worse things, like making you part of a botnet, adding keystroke loggers etc.

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  • Could you list me one attack that leads to install any given random toolbar to a browser ? – user45139 Jul 7 '14 at 9:56
  • Irrelevant. You asked if it is the only way, and the answer is most definitely no. In my answer I explain why you wouldn't bother, as adding a toolbar is low value compared to total compromise. – Rory Alsop Jul 7 '14 at 10:02

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