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Vigil@nce: IE6, address bar spoofing

October 2008 by Vigil@nce

SYNTHESIS

An attacker can use special characters in order to alter the display of the address bar in IE6 to deceive users.

Gravity: 1/4

Consequences: disguisement

Provenance: document

Means of attack: no proof of concept, no attack

Ability of attacker: expert (4/4)

Confidence: multiples sources (3/5)

Diffusion of the vulnerable configuration: high (3/3)

Number of vulnerabilities in this bulletin: 2

Creation date: 28/10/2008

IMPACTED PRODUCTS

- Microsoft Internet Explorer

DESCRIPTION

The Internet Explorer address bar displays the url of the current web page. Two vulnerabilities can be used by an attacker to display a trusted url while the current web page is malicious.

An attacker can use the unbreakable character ( or U+00A0) to force the url to be longer than the address bar. For example "http://trusted......attacker/" will be truncated, and thus the victim will only see "http://trusted". [grav:1/4]

An attacker may register a domain name containing a forbidden character, such as "trus\xC2\xA9ted.dom" (which is theorically impossible). Internet Explorer does not display forbidden characters, so the victim would see "trusted.dom". [grav:1/4]

CHARACTERISTICS

Identifiers: VIGILANCE-VUL-8205

http://vigilance.aql.fr/vulnerabili...




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