Vulnerability identifier: #VU21420

Vulnerability risk: Low

CVSSv3.1: 6 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-16275

CWE-ID: CWE-20

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
wpa_supplicant
Server applications / Encryption software
hostapd
Server applications / Remote access servers, VPN

Vendor: Jouni Malinen

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to the affected software allows an incorrect indication of disconnection in certain situations because source address validation is mishandled. A remote attacker in radio range of the access point can send a specially crafted 802.11 frame and cause a denial of service condition on target system.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

wpa_supplicant: 2.0 - 2.9

hostapd: 2.0 - 2.9

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External links
http://www.openwall.com/lists/oss-security/2019/09/12/6
http://lists.debian.org/debian-lts-announce/2019/09/msg00017.html
http://usn.ubuntu.com/4136-1/
http://usn.ubuntu.com/4136-2/
http://w1.fi/security/2019-7/
http://w1.fi/security/2019-7/ap-mode-pmf-disconnection-protection-bypass.txt
http://www.openwall.com/lists/oss-security/2019/09/11/7

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.