hostapd invalid EAPoL frame denial of service

hostapd-eapol-dos (26239) The risk level is classified as MediumMedium Risk


hostapd is vulnerable to a denial of service, caused by a buffer overflow in the wpa.c file. By sending an EAPoL frame with an overly long key_data_length field, a remote attacker could overflow a buffer and cause the hostapd daemon to crash.


Denial of Service


For Debian GNU/Linux:
Refer to DSA-1065-1 for patch, upgrade, or suggested workaround information. See References.


  • Debian Bug report logs - #365897: seg fault error in hostapd.
  • hostapd Web page: hostapd: IEEE 802.11 AP, IEEE 802.1X/WPA/WPA2/EAP/RADIUS Authenticator.
  • BID-17846: hostapd Invalid EAPOL Key Length Remote Denial Of Service Vulnerability
  • CVE-2006-2213: Hostapd 0.3.7-2 allows remote attackers to cause a denial of service (segmentation fault) via an unspecified value in the key_data_length field of an EAPoL frame.
  • DSA-1065: hostapd -- missing input sanitising
  • MDKSA-2006:088: Updated hostapd package to address DoS vulnerability
  • OSVDB ID: 25233: Hostapd EAPoL Frame Handling Remote DoS
  • SA19966: Hostapd EAPoL Frame Handling Denial of Service

Platforms Affected:

  • Debian Debian Linux 3.1
  • FreeBSD FreeBSD
  • Jouni Malinen hostapd 0.3.7
  • MandrakeSoft Mandrake Linux 2006 X86_64
  • MandrakeSoft Mandrake Linux 2006
  • MandrakeSoft Mandrake Linux LE2005 X86_64
  • MandrakeSoft Mandrake Linux LE2005


May 03, 2006

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