Improper Authentication in hostapd (Alpine package)

1) Improper Authentication

EUVDB-ID: #VU23961

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-9496

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to missing state validation steps when processing the SAE confirm message when in hostapd/AP mode. A remote attacker can bypass authentication process, force the hostapd process to terminate and perform a denial of service (DoS) attack on the target system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

hostapd (Alpine package): 1.1-r0 - 2.6-r2

External links

http://git.alpinelinux.org/aports/commit/?id=f1fd2a573425793de610a615092f210f1c50f0ad
http://git.alpinelinux.org/aports/commit/?id=031621e2cf39f9441cb620e4ebfb5261276e7978
http://git.alpinelinux.org/aports/commit/?id=091dec18c2b06659b1b4778559ab25cd06829630
http://git.alpinelinux.org/aports/commit/?id=15604368388fdc2804ed11c919a38b25b4201ca9
http://git.alpinelinux.org/aports/commit/?id=4c63d15964419d85bba90df9bfeb8f6af833b40b
http://git.alpinelinux.org/aports/commit/?id=980e2263332f78779379c51e24efb6180ed7d4a3
http://git.alpinelinux.org/aports/commit/?id=904e2d699295d64fe5097fc46a9c6719fe26dc7a

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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