TITLE:
Blackboard Learning and Community Portal Systems "frameset.jsp"
Weakness

SECUNIA ADVISORY ID:
SA17991

VERIFY ADVISORY:
http://secunia.com/advisories/17991/

CRITICAL:
Not critical

IMPACT:
Security Bypass

WHERE:
>From remote

SOFTWARE:
Blackboard Learning and Community Portal Systems 6
http://secunia.com/product/1002/

DESCRIPTION:
dr_insane has reported a weakness in Blackboard Learning and
Community Portal Systems, potentially allowing malicious people to
conduct phishing attacks.

The weakness is caused due to a design error in the way  Blackboard
Learning and Community Portal Systems displays an unverified user
supplied argument (url) in its own frameset after successful
authentication. This can e.g. be exploited by tricking a user into
following a link from a HTML document to the trusted login page with
a malicious "TARGET" URL. After successful authentication, the
untrusted (fake) site will be displayed in the frameset of the
trusted site.

Example:
http://[host]/webapps/portal/frameset.jsp?tab_id=[tabid]&url=[url]

The vulnerability has been reported in version 6.2.3.23 and
6.3.1.424. Other versions may also be affected.

SOLUTION:
Do not follow links from untrusted sites or emails.

PROVIDED AND/OR DISCOVERED BY:
dr_insane

ORIGINAL ADVISORY:
http://www.ipomonis.com/advisories.htm

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