Types of Web-Based Client-Side Attacks
by Christian Seifert - Tuesday, 9 September 2008.
Cross site/domain/zone scripting is a vulnerability of web pages which allow execution of injected code in the security context of that page when the user visits such a page. The injected code could be used to steal information, but also permit execution of arbitrary code on the client if, for instance, that web page is a trusted page in the context of the web browser.

Drive-by-pharming is an web-based client-side attack that modify the DNS settings of a user's router by merely having a user visit a malicious web page. These attacks do not impact the integrity of the client machine directly, but rather impact the integrity of network components the client relies on.

Hosting of malware is another type of attack that impacts integrity of the client. In this attack scenario, the malicious web page hosts malware and uses social engineering to entice the user to download and execute the malware. An example of such a technique is a video codec that contains malware, which is presented to be a requirement to view pornographic material (e.g. Fake Celebrity Video Sites Serving Malware) Once the user downloads and executes the malware, the malware has complete control of the machine. Attacks that do not require this user interaction, but rather are capable of pushing and executing malware without user's notice or consent are drive-by-download attacks. These attacks usually trigger having a user merely visit a web page.

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