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Category:   Application (Security)  >   FreeRADIUS Vendors:   FreeRADIUS Server Project
FreeRADIUS 'Ascend-Send-Secret' Processing Error Lets Remote Users Crash the Service
SecurityTracker Alert ID:  1011364
SecurityTracker URL:  http://securitytracker.com/id/1011364
CVE Reference:   CVE-2004-0938, CVE-2004-0960, CVE-2004-0961   (Links to External Site)
Updated:  Oct 20 2004
Original Entry Date:  Sep 20 2004
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.0.0
Description:   A vulnerability was reported in FreeRADIUS. A remote user can cause the target RADIUS service to crash.

The VulnDisco RADIUS test suite includes tests for a previously unreported denial of service vulnerability in FreeRADIUS 1.0.0.

The vendor reported that Ascend-Send-Secret, like Tunnel-Password, requires an "original" packet to decode the attribute [CVE: ]. The software checks for Tunnel-Password, but not Ascend-Send-Secret.

The flaw resides in 'radius.c' and 'eap_tls.c'.

The vendor also reported that a remote user can supply malformed USR vendor-specific attributes to invoke a memcpy() operation with a '-1' argument, causing the RADIUS service to crash [CVE: CVE-2004-0960].

The vendor also reported that a remote user can send a series of Access-Request packets with Ascend-Send-Secret, Ascend-Recv-Secret, or Tunnel-Password attributes to cause the service to consume all available memory [CVE: CVE-2004-0961].

Impact:   A remote user can cause the RADIUS service to crash.
Solution:   The vendor has released a fixed version (1.0.1), available at:

ftp://ftp.freeradius.org/pub/radius/

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

Message History:   This archive entry has one or more follow-up message(s) listed below.
Sep 23 2004 (Gentoo Issues Fix) FreeRADIUS 'Ascend-Send-Secret' Processing Error Lets Remote Users Crash the Service
Gentoo has released a fix.
Nov 14 2004 (Red Hat Issues Fix) FreeRADIUS 'Ascend-Send-Secret' Processing Error Lets Remote Users Crash the Service
Red Hat has released a fix for Red Hat Enterprise Linux 3.
Feb 3 2005 (Fedoa Issues Fix) FreeRADIUS 'Ascend-Send-Secret' Processing Error Lets Remote Users Crash the Service
Fedora has released a fix.



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