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Denial of Service against Gauntlet-Firewall / SQL-Gateway


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Date: 24 Sep 2003 13:17:14 -0000
From: Oliver Heinz <heinz@arago.de.>
To: [email protected]
Subject: Denial of Service against Gauntlet-Firewall / SQL-Gateway





DOS-Attack against Gauntlet Firewall

-------------------------------------

We found out a security-issue with the Oracle-Proxy (SQL-Gateway) of Gauntlet Firewall, Version 6 (manufactured by Secure Computing/NAI, serversrunning Solaris 8, newest Patches installed). 



Abstract:

---------

Sending subsequent requests with invalid data to the firewalls SQL-gateway results in an immediate crash. The firewall won't accept any further connections on any SQL-gw that is defined in the rule base.

Secure Computing as vendor of Gauntlet could reproduce the DOS, patches or bug fixes are not yet available.



Description:

-------------

We tried to monitor the firewall's sql-gw with our own monitoring-system to make sure that we notice if it does not run. Some seconds later, the sql-gw crashed and we were no longer able to connect the port.



Further investigation of the problem showed that the sql-gw-process can easily be crashed on any Gauntlet-Firewall by simply connecting to it:



Try the following (_very_ basic)script, use your firewall's IP instead of aaa.bbb.ccc.ddd, running sql-gw at the standard port 1521: 



        for a in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

        do

        telnet aaa.bbb.ccc.ddd 1521

        done 



You will see that the last try to connect (#17) results in "Connection refused" and the process of "sql-gw" is no longer running on the firewall. ==> A DOS against Gauntlet is very easy.



This is especially unpleasant, as Gauntlet is one of the few major firewall-products that provide true application level security _and_ do have a dedicated application-proxy for SQL (sql-net 1 + 2). 

In fact, many companies use Gauntlet especially to protect database-servers.



Solution/ Patches:

------------------

Secure Computing (www.securecomputing.com), the manufacturer of Gauntlet-Firewall, has been informed by arago about the issue in August 2003 and has been able to reproduce the problem. 

Unfortunately, they have not yet managed to bring out a security-patch :-(

The only current solution they give is to use "plug-gws" instead of the "sql-gws", which obviously weakens security _and_ performance a lot, as you lose application-level security!   



Regards, Oliver Heinz





 

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 | arago,                   | Oliver Heinz                             |

 | Institut fuer komplexes  | Bereichsleiter Systembetrieb & Security  |

 | Datenmanagement AG       | eMail: [email protected]                    |

 | Am Niddatal 3            |                                          |

 | 60488 Frankfurt am Main  | http://www.arago.de/                     |

 |                          | PGP-Fingerprint: a5de d4b4 46b3 4d8b 2646|

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