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Vigil@nce: Exchange OWA, redirecting to a site

October 2008 by Vigil@nce

SYNTHESIS

An attacker can send an email containing a special url to the
victim, and invite him to click on this link to be redirected to
another web site.

Gravity: 1/4

Consequences: disguisement

Provenance: document

Means of attack: 1 proof of concept

Ability of attacker: specialist (3/4)

Confidence: confirmed by the editor (5/5)

Diffusion of the vulnerable configuration: medium (2/3)

Creation date: 16/10/2008

IMPACTED PRODUCTS

 Microsoft Exchange

DESCRIPTION

The OWA web interface offers a webmail which can be used to read
emails stored in the mailbox.

The following link is used to redirect a url:
https://owa_server/exchweb/bin/redir.asp?URL=...

An attacker can send an email containing this url. As the url
starts by "https://owa_server/", the victim can be fooled and
think that the link he is about to click on is legitimate.
However, he will be redirected to the url indicated by the
attacker.

It can be noted that the final url in the address bar is the
attacker’s one (not https://owa_server/...). Some victims thus
immediately realize that they were redirected.

An attacker can therefore send an email containing a special url
to the victim, and invite him to click on this link to be
redirected to another web site.

CHARACTERISTICS

Identifiers: BID-31765, CVE-2008-1547, VIGILANCE-VUL-8181

http://vigilance.aql.fr/vulnerability/8181


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