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Category:   Application (Security)  >   FreeRADIUS Vendors:   FreeRADIUS Server Project
FreeRADIUS Input Validation Error in EAP-MSCHAPv2 Module May Let Remote Users Bypass Authentication
SecurityTracker Alert ID:  1015795
SecurityTracker URL:  http://securitytracker.com/id/1015795
CVE Reference:   CVE-2006-1354   (Links to External Site)
Updated:  Apr 4 2006
Original Entry Date:  Mar 21 2006
Impact:   Denial of service via network, Host/resource access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.0.0 - 1.1.0
Description:   A vulnerability was reported in FreeRADIUS. A remote user may be able to bypass authentication checks.

The EAP-MSCHAPv2 module state machine does not properly validate user-supplied input. A remote user may be able to modify their EAP-MSCHAPv2 client state machine to cause the target server to bypass authentication checks. This may also cause the target server to crash.

Impact:   A remote user may be able to bypass authentication checks.

A remote user may also be able to cause the target service to crash.

Solution:   The vendor has issued a fixed version (1.1.1), available at:

http://www.freeradius.org/getting.html

Vendor URL:  www.freeradius.org/ (Links to External Site)
Cause:   Authentication error, Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Apr 4 2006 (Red Hat Issues Fix) FreeRADIUS Input Validation Error in EAP-MSCHAPv2 Module May Let Remote Users Bypass Authentication
Red Hat has released a fix for Red Hat Enterprise Linux 3 and 4.



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