[NT] ISS Server Sensor Denial of Service
From: SecuriTeam (support_at_securiteam.com)
Date: 09/07/03
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To: list@securiteam.com Date: 7 Sep 2003 11:05:43 +0200
The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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ISS Server Sensor Denial of Service
------------------------------------------------------------------------
SUMMARY
By sending a properly formatted URL via SSL, an attacker can successfully
shut down Microsoft's IIS service stopping all Web and FTP servers.
DETAILS
Vulnerable systems:
* ISS Server Sensor version 7.0 XPU 20.16
* ISS Server Sensor version 7.0 XPU 20.18
Immune systems:
* ISS Server Sensor version 7.0 XPU 20.19
ISS server sensor 7.0 has the ability to plug into ISS via an ISAPI
plug-in to allow for IDS on SSL traffic.
By simply sending a properly formatted URL via SSL, the ISAPI filter will
crash IIS shutting down the service entirely. IIS 5 may automatically
restart the service when it detects that the service has stopped.
Vendor Status:
We contacted ISS on or about August 14 concerning this issue. ISS has
since released XPU 20.19 that addresses this specific issue.
ADDITIONAL INFORMATION
The information has been provided by <mailto:research@enteredge.com>
EnterEdge Technology, LLC .
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