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TITLE:
TWiki Registration Account Override Vulnerability

SECUNIA ADVISORY ID:
SA20596

VERIFY ADVISORY:
http://secunia.com/advisories/20596/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass, Privilege escalation

WHERE:
>From remote

SOFTWARE:
TWiki
http://secunia.com/product/4248/

DESCRIPTION:
A vulnerability has been reported in TWiki, which can be exploited by
malicious people to bypass certain security restrictions.

The vulnerability is caused due to an error in the registration
process. This can be exploited to register as an already registered
user by changing the action attribute of the form element to the
Sandbox web.

Successful exploitation allows a malicious person to gain the
privileges of an already registered user (e.g. a user with
TWikiAdminGroup privileges), but requires that the
"MapUserToWikiName" setting is enabled.

The vulnerability has been reported in the following releases:
* TWikiRelease04x00x02
* TWikiRelease04x00x01
* TWikiRelease04x00x00

SOLUTION:
Apply patch (see original advisory).

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Harald Jörg.

ORIGINAL ADVISORY:
http://twiki.org/cgi-bin/view/Codev/SecurityAlertTWiki4PrivilegeElevation

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About:
This Advisory was delivered by Secunia as a free service to help
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