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Category:   Device (Firewall)  >   ScreenOS (NetScreen) Vendors:   NetScreen
NetScreen H.323 Session State Bug Lets Remote Users Deny Service
SecurityTracker Alert ID:  1005708
SecurityTracker URL:  http://securitytracker.com/id/1005708
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Nov 25 2002
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 2.8, 3.0, 3.1, 4.0
Description:   A denial of service vulnerability was reported in NetScreen's firewall/VPN appliances. A remote user can prevent the firewall from processing additional sessions.

It is reported that a remote user can exploit a flaw in the processing of H.323 control sessions to cause the firewall's session table to fill up, preventing additional sessions.

According to the report, half-open H.323 sessions may remain until the defined H.323 session timeout interval (apparently this is typically 36 hours) instead of being closed out at a more frequent interval.

NetScreen reports that the system is only vulnerable if configured to permit H.323 or Netmeeting services.

NetScreen credits Stephen Gill with reporting this flaw.

Impact:   A remote user can deny service to firewall users.
Solution:   The vendor has indicated that you can install a maintenance release (see the vendor advisory for the release table) or upgrade to ScreenOS 4.0.1. The vendor advisory is available at:

http://www.netscreen.com/support/alerts/Potential_H_323_Denial_of_Service.html

Registered users with a valid service contract can download updates to:

http://www.netscreen.com/support/updates.html

Vendor URL:  www.netscreen.com/support/alerts/Potential_H_323_Denial_of_Service.html (Links to External Site)
Cause:   State error
Underlying OS:  

Message History:   None.


 Source Message Contents

Date:  Mon, 25 Nov 2002 17:53:13 -0500
Subject:  NetScreen Security Alert 52020


http://www.netscreen.com/support/alerts/Potential_H_323_Denial_of_Service.html

NetScreen issued Security Alert 52020 regarding a denial of service vulnerability in
NetScreen's firewall/VPN appliances

Versions:  ScreenOS 2.8, 3.0, 3.1, 4.0

A remote user can exploit a flaw in the processing of H.323 control sessions to cause the
firewall's session table to fill up, preventing additional sessions.

According to the report, half-open H.323 sessions may remain until the defined H.323
session timeout interval (apparently this is typically 36 hours) instead of being closed
out at a more frequent interval.

NetScreen reports that the system is only vulnerable if configured to permit H.323 or
Netmeeting services.

The vendor has indicated that you can install a maintenance release (see the vendor
advisory for the release table) or upgrade to ScreenOS 4.0.1.


Registered users with a valid service contract can download updates to:

http://www.netscreen.com/support/updates.html

NetScreen credits Stephen Gill with reporting this flaw.



 
 


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