[NEWS] BEA WebLogic Server Infinite Invalid Authentication Attempts

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BEA WebLogic Server Infinite Invalid Authentication Attempts
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SUMMARY

BEA WebLogic Server is "the world leading application server software".
It's possible to launch a credentials brute force attack against known
users through an BEA WebLogic Server's internal servlet that permits the
bypass of the user locking mechanism.

DETAILS

Vulnerable Systems:
* BEA WebLogic Server version 7.0sp6
* BEA WebLogic Server version 8.1sp4
* BEA WebLogic Server version 9.0sp2

Immune Systems:
* BEA WebLogic Server version 6.x and prior

To avoid credential brute force attacks, Weblogic server have a locking
mechanism that lock the corresponding account after some invalid login
attempts.

The default lock shots if 5 invalid login attempts were made. The lock
remains 30 minutes.

S21SEC has found that exists an internal servlet that allow the guess of
valid credentials even if the attacked account is locked.

This allows infinite invalid authentication attempts against an account.
When the correct credentials are guessed, it's only needed to wait for the
account to unlock and then logon into the server.

The affected servlet is:
/wl_management_internal1/LogfileSearch (Version 7 & 8)
/bea_wls_diagnostics/accessor (Version 9)

Workaround:
BEA has released an advisory about this vulnerability. Updates and more
information are available at Bea website:
<http://dev2dev.bea.com/pub/advisory/271>
http://dev2dev.bea.com/pub/advisory/271


ADDITIONAL INFORMATION

The information has been provided by <mailto:rpinuaga@xxxxxxxxxx> Ramon
Pinuaga Cascales.
The original article can be found at:
<http://www.s21sec.com/avisos/s21sec-040-en.txt>
http://www.s21sec.com/avisos/s21sec-040-en.txt



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