Vulnerability CVE-2019-11555
Published: 2019-04-26   Modified: 2019-04-27

Description:
The EAP-pwd implementation in hostapd (EAP server) before 2.8 and wpa_supplicant (EAP peer) before 2.8 does not validate fragmentation reassembly state properly for a case where an unexpected fragment could be received. This could result in process termination due to a NULL pointer dereference (denial of service). This affects eap_server/eap_server_pwd.c and eap_peer/eap_pwd.c.

Type:

CWE-476

 (NULL Pointer Dereference)

CVSS2 => (AV:N/AC:M/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
W1.fi -> Hostapd 
W1.fi -> Wpa supplicant 

 References:
http://www.openwall.com/lists/oss-security/2019/04/26/1
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5T7G763UECWR7FQXOJVL67PW7C5A3SA4/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IQ6P2GI5GSXRNLNIUNPARFZQVDEIGVZD/
https://seclists.org/bugtraq/2019/May/40
https://seclists.org/bugtraq/2019/May/64
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:03.wpa.asc
https://usn.ubuntu.com/3969-1/
https://usn.ubuntu.com/3969-2/
https://w1.fi/security/2019-5/
https://w1.fi/security/2019-5/eap-pwd-message-reassembly-issue-with-unexpected-fragment.txt
https://www.debian.org/security/2019/dsa-4450
https://www.openwall.com/lists/oss-security/2019/04/18/6
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