hostapd EAP-TLS message denial of service

hostapd-eaptls-dos (79104) The risk level is classified as MediumMedium Risk

Description:

hostapd is vulnerable to a denial of service, caused by a buffer overflow in the eap_server_tls_process_fragment(). If hostapd is configured to use the internal EAP authentication server, an attacker could send a specially-crafted EAP-TLS message to overflow a buffer and cause the service to crash.

*CVSS:

Base Score: 4.3
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
 
Temporal Score: 3.2
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Refer to hostapd Web page for patch, upgrade or suggested workaround information. See References.

References:

  • hostapd Web page: hostapd: IEEE 802.11 AP, IEEE 802.1X/WPA/WPA2/EAP/RADIUS Authenticator.
  • pfSense Web site: pfSense Open Source Firewall Distribution - Home.
  • PRE-SA-2012-07: Hostapd specially crafted EAP-TLS messages denial of service.
  • BID-55826: hostapd CVE-2012-4445 Message Handling Denial of Service Vulnerability
  • CVE-2012-4445: Heap-based buffer overflow in the eap_server_tls_process_fragment function in eap_server_tls_common.c in the EAP authentication server in hostapd 0.6 through 1.0 allows remote attackers to cause a denial of service (crash or abort) via a small TLS Message Length value in an EAP-TLS message with the More Fragments flag set.
  • DSA-2557: hostapd -- buffer overflow
  • OSVDB ID: 86051: hostapd eap_server/eap_server_tls_common.c eap_server_tls_process_fragment() Function TLS Message Fragment Data Parsing Remote Overflow
  • SA50888: hostapd EAP-TLS Message Handling Denial of Service Vulnerability
  • SA51674: pfSense Multiple Vulnerabilities

Platforms Affected:

  • pfSense pfSense 2.0
  • W1.Fi Hostapd 0.6.0
  • W1.Fi Hostapd 0.6.1
  • W1.Fi Hostapd 0.6.2
  • W1.Fi Hostapd 0.6.3
  • W1.Fi Hostapd 0.6.4
  • W1.Fi Hostapd 0.6.5
  • W1.Fi Hostapd 0.6.6
  • W1.Fi Hostapd 0.6.7
  • W1.Fi Hostapd 0.7.0
  • W1.Fi Hostapd 0.7.1
  • W1.Fi Hostapd 0.7.2
  • W1.Fi Hostapd 0.7.3

Reported:

Oct 08, 2012

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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