CVE-2019-11555

Ubuntu Security Notice USN-3969-2

Severity Score

5.9

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

La implementación de EAP-pwd en hostapd (servidor EAP),versiones anteriores a 2.8, y wpa_supplicant (peer EAP), versiones anteriores a 2.8, no valida correctamente el estado de reensamblado de la fragmentación para un caso en el que se pudiera recibir un fragmento no esperado. Esto podría derivar en la terminación del proceso debido a una derivación de un puntero NULL (denegación de servicio). Esto afecta a eap_server/eap_server_pwd.c y eap_peer/eap_pwd.c.

USN-3969-1 fixed a vulnerability in wpa_supplicant and hostapd. This update provides the corresponding update for Ubuntu 14.04 ESM. It was discovered that wpa_supplicant and hostapd incorrectly handled unexpected fragments when using EAP-pwd. A remote attacker could possibly use this issue to cause a denial of service. Various other issues were also addressed.

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-04-26 CVE Reserved
2019-04-26 CVE Published
2024-08-04 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-476: NULL Pointer Dereference

CAPEC

References (15)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2019/07/msg00030.html	Mailing List
https://seclists.org/bugtraq/2019/May/40	Mailing List
https://seclists.org/bugtraq/2019/May/64	Mailing List

URL	Date	SRC

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2019/04/26/1	2023-11-07
https://w1.fi/security/2019-5	2023-11-07
https://www.openwall.com/lists/oss-security/2019/04/18/6	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5T7G763UECWR7FQXOJVL67PW7C5A3SA4	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DJKZHAT5KPUN26JL77EUH563GAH5XZ5C	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IQ6P2GI5GSXRNLNIUNPARFZQVDEIGVZD	2023-11-07
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:03.wpa.asc	2023-11-07
https://security.gentoo.org/glsa/201908-25	2023-11-07
https://usn.ubuntu.com/3969-1	2023-11-07
https://usn.ubuntu.com/3969-2	2023-11-07
https://w1.fi/security/2019-5/eap-pwd-message-reassembly-issue-with-unexpected-fragment.txt	2023-11-07
https://www.debian.org/security/2019/dsa-4450	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
W1.fi Search vendor "W1.fi"		Hostapd Search vendor "W1.fi" for product "Hostapd"				< 2.8 Search vendor "W1.fi" for product "Hostapd" and version " < 2.8"		-		Affected
W1.fi Search vendor "W1.fi"		WPA Supplicant Search vendor "W1.fi" for product "WPA Supplicant"				< 2.8 Search vendor "W1.fi" for product "WPA Supplicant" and version " < 2.8"		-		Affected