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Category:   Application (Security)  >   isakmpd Vendors:   OpenBSD
OpenBSD isakmpd Error Lets Remote Users Bypass the Replay Protection
SecurityTracker Alert ID:  1016757
SecurityTracker URL:  http://securitytracker.com/id/1016757
CVE Reference:   CVE-2006-4436   (Links to External Site)
Updated:  Jun 8 2008
Original Entry Date:  Aug 25 2006
Impact:   Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  

Description:   A vulnerability was reported in isakmpd on OpenBSD. A remote user can bypass IPSec packet replay protection.

When isakmpd(8) acts as responder during security assocation (SA) negotiation, SA's with a replay window of size 0 may be created. This allows a remote user with the ability to sniff IPSec packets to reinject those packets without the replay being detected.

Impact:   A remote user may be able to bypass the replay protection in certain cases.
Solution:   OpenBSD has issued the following fixes:

ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.9/common/008_isakmpd.patch
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.8/common/013_isakmpd.patch

Vendor URL:  www.openbsd.org/ (Links to External Site)
Cause:   State error
Underlying OS:  UNIX (OpenBSD)
Underlying OS Comments:  3.8, 3.9

Message History:   None.


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