Permissions, Privileges, and Access Controls in busybox (Alpine package)

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU23963

Risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-9498

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to the implementations of EAP-PWD in hostapd EAP Server, when built against a crypto library missing explicit validation on imported elements, do not validate the scalar and element values in EAP-pwd-Commit. A remote attacker can use invalid scalar/element values to complete authentication.

This vulnerability affects the following products:

• hostapd with SAE support and wpa_supplicant with SAE support prior to and including version 2.4

• hostapd with EAP-pwd support and wpa_supplicant with EAP-pwd support prior to and including version 2.7

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.