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Category:   Application (Generic)  >   wpa_supplicant Vendors:   Malinen, Jouni et al
wpa_supplicant Key Data Length Missing Validation Lets Remote Users Crash the Service
SecurityTracker Alert ID:  1013226
SecurityTracker URL:  http://securitytracker.com/id/1013226
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Feb 17 2005
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 0.2.7 and 0.3.8
Description:   A vulnerability was reported in wpa_supplicant in the processing of WPA2 frames. A remote user can cause denial of service conditions.

The software does not properly validate the Key Data Length in received EAPOL-Key frames. A remote user can send a specially crafted packet to trigger a buffer overflow and cause wpa_supplicant to crash.

If WPA2 is enabled, a remote user can send a specially crafted EAPOL-Key frame (message 1 of 4-Way Handshake) to trigger the buffer overflow. If WPA2 is not enabled, a remote authenticated user can send specially crafted frames (message 3 of 4-Way Handshake) to trigger the overflow.

The vulnerability resides in 'wpa.c'.

Impact:   A remote user can cause the target service to crash.
Solution:   The vendor has released fixed versions (0.3.8 and 0.2.7), available at:

http://hostap.epitest.fi/wpa_supplicant/

Vendor URL:  hostap.epitest.fi/wpa_supplicant/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Feb 17 2005 (Gentoo Issues Fix) wpa_supplicant Key Data Length Missing Validation Lets Remote Users Crash the Service
Gentoo has released a fix.



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