Improper Authentication in busybox (Alpine package)

1) Improper Authentication

EUVDB-ID: #VU23961

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

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

busybox (Alpine package): 1.31.1-r16 - 1.31.1-r21

busybox (Alpine package):

CPE2.3

• cpe:2.3:o:alpine:busybox_alpine_package:1.31.1-r16:*:*:*:*:alpine_linux:*:3.12
• cpe:2.3:o:alpine:busybox_alpine_package:1.31.1-r17:*:*:*:*:alpine_linux:*:3.12
• cpe:2.3:o:alpine:busybox_alpine_package:1.31.1-r18:*:*:*:*:alpine_linux:*:3.12
• cpe:2.3:o:alpine:busybox_alpine_package::*:*:*:*:alpine_linux:*:*

External links

https://git.alpinelinux.org/aports/commit/?id=76077dfdd8d77220a469c5743b7b7fd3484300a1

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.