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

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU23963

Risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

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

hostapd (Alpine package): 1.1-r0 - 2.7-r3

External links

http://git.alpinelinux.org/aports/commit/?id=b7d037c2a9b8f72b1230453919246b1637028ada
http://git.alpinelinux.org/aports/commit/?id=4d3ebcee7e5f68b1e6f145336363ec5a52d6ca17
http://git.alpinelinux.org/aports/commit/?id=a39d043ea01e0fb7b6bde640d1d2e3fb90685a1e

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.