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AUSCERT External Security Bulletin Redistribution
ESB-2015.0409
TYPO3-CORE-SA-2015-001: Authentication Bypass in TYPO3 CMS 4.5
20 February 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: TYPO3
Publisher: TYPO3
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
Original Bulletin:
http://typo3.org/teams/security/security-bulletins/typo3-core/typo3-core-sa-2015-001/
Comment: The TYPO3 team has stated that "updating or patching your
installations to fix this CRITICAL vulnerability is STRONGLY
ADVISED!"
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TYPO3-CORE-SA-2015-001: Authentication Bypass in TYPO3 CMS 4.5
February 19, 2015
Category: TYPO3 CMS
Author: Helmut Hummel
It has been discovered that TYPO3 CMS 4.5.x is vulnerable to Authentication
Bypass.
Component Type: TYPO3 CMS
Vulnerability Types: Authentication Bypass
Overall Severity: Critical
Release Date: February 19, 2015
Vulnerable subcomponent: rsaauth system extension
Vulnerability Type: Authentication Bypass
Affected Versions: Versions 4.3.0 to 4.3.14, 4.4.0 to 4.4.15, 4.5.0 to 4.5.39
and 4.6.0 to 4.6.18
Severity: Critical
Suggested CVSS v2.0: AV:N/AC:L/Au:N/C:P/I:P/A:N/E:F/RL:O/RC:C
CVE: not assigned yet
Problem Description: It has been discovered that TYPO3 CMS is vulnerable to
Authentication Bypass. Frontend users can be authenticated by only knowing
their username.
TYPO3 installations are affected, if all of the following applies:
TYPO3 Version 4.3.0 to 4.3.14, 4.4.0 to 4.4.15, 4.5.0 to 4.5.39 or 4.6.0
to 4.6.18
users/access restricted frontend area (frontend login)
system extension rsaauth is loaded
system extension rsaauth is configured for frontend usage like that:
$GLOBALS['TYPO3_CONF_VARS']['FE']['loginSecurityLevel'] = 'rsa'
TYPO3 installations are not affected, if at least one of the following
applies:
TYPO3 Version 4.7.0 or higher
no users/access restricted frontend area (TYPO3 Backend authentication is
not affected)
system extension rsaauth is not loaded (default)
system extension rsaauth is not configured for frontend usage like that
(default):
$GLOBALS['TYPO3_CONF_VARS']['FE']['loginSecurityLevel'] = 'rsa'
Solution: Update to TYPO3 version 4.5.40 that fixes the problem described.
Alternatively use the provided shell script to patch all affected TYPO3
versions (all between 4.3 and 4.6) that are found in a specified directory or
use the diff file to patch the installations manually.
Important Note: Updating or patching your installations to fix this CRITICAL
vulnerability is STRONGLY ADVISED!
Credits: Thanks to Pierrick Caillon who discovered and reported the
vulnerability and to Security Team Member Nicole Cordes for developing a fix
and providing the shell script.
General Advice: Follow the recommendations that are given in the TYPO3
Security Guide. Please subscribe to the typo3-announce mailing list.
General Note: All security related code changes are tagged so that you can
easily look them up on our review system.
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