From: Secunia Security Advisories (sec-advsecunia.com)
Date: Thu Jan 14 2010 - 13:17:10 CST

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TITLE:
TYPO3 OpenID Identity Authentication Security Bypass

SECUNIA ADVISORY ID:
SA38206

VERIFY ADVISORY:
http://secunia.com/advisories/38206/

DESCRIPTION:
A security issue has been reported in TYPO3, which can be exploited
by malicious people to bypass certain security restrictions.

The security issue is caused due to an error in the system extension
"openid" when using OpenID identities for authentication. This can be
exploited to log in to the TYPO3 backend by using a backend user
account's OpenID identity.

Successful exploitation requires an enabled system extension "openid"
(disabled by default), knowledge of the OpenID identity assigned to a
TYPO3 backend user account, and that the attacker and victim have
identities from the same OpenID provider.

NOTE: Only OpenID identities from providers, who discard submitted
OpenID identities and allow users to choose a different identity, are
vulnerable.

The security issue is reported in version 4.3.0. Prior versions may
also be affected.

SOLUTION:
Update to version 4.3.1.

PROVIDED AND/OR DISCOVERED BY:
Jeff Segars, TYPO3 Core team.

ORIGINAL ADVISORY:
TYPO3-SA-2010-001:
http://typo3.org/teams/security/security-bulletins/typo3-sa-2010-001/

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