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Category:   OS (Linux)  >   Linux Kernel Vendors:   Red Hat
Red Hat Enterprise Linux Default IPSec Script Uses IKE Aggressive Mode
SecurityTracker Alert ID:  1019563
SecurityTracker URL:  http://securitytracker.com/id/1019563
CVE Reference:   CVE-2008-1198   (Links to External Site)
Date:  Mar 7 2008
Impact:   Disclosure of authentication information
Vendor Confirmed:  Yes  
Version(s): RHEL 3, 4, and 5
Description:   A vulnerability was reported in Red Hat Enterprise Linux in the default IPSec ifup script. A remote user can conduct brute force attacks.

The default IPSec ifup script (/etc/sysconfig/network-scripts/ifup-ipsec) configures racoon to use IKE aggressive mode. When IPSec is used with pre-shared key authentication and aggressive mode is employed, a remote user monitoring the network can obtain the pre-shared key hash and conduct brute force attacks to recover the pre-shared key.

Michael Thumann and Enno Rey reported this vulnerability in the following paper:

http://www.ernw.de/download/pskattack.pdf

Impact:   A remote user monitoring the network can conduct brute force attacks to determine the original pre-shared key.
Solution:   No solution was available at the time of this entry.
Vendor URL:  www.redhat.com/ (Links to External Site)
Cause:   Access control error

Message History:   This archive entry has one or more follow-up message(s) listed below.
Feb 21 2012 (Red Hat Issues Fix) Red Hat Enterprise Linux Default IPSec Script Uses IKE Aggressive Mode
Red Hat has issued a fix for Red Hat Enterprise Linux 5.



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