Improper input validation in wpa_supplicant (Alpine package)

1) Improper input validation

EUVDB-ID: #VU14295

Risk: Low

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:Clear]

CVE-ID: CVE-2018-14526

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists on the systems where WPA2/RSN style of EAPOL-Key construction is used with TKIP negotiated as the pairwise cipher due to an error when processing malicious input. A remote attacker can send specially crafted unauthenticated EAPOL-Key frame data to modify the Group Transient Key (GTK) and prevent the target system from accepting group-addressed frames.

Mitigation

Install update from vendor's website.

Vulnerable software versions

wpa_supplicant (Alpine package): 2.5-r0 - 2.6-r2

CPE2.3

• cpe:2.3:a:alpine:wpa_supplicant_alpine_package:2.5-r0:*:*:*:*:alpine_linux:*:3.2
• cpe:2.3:a:alpine:wpa_supplicant_alpine_package:2.5-r1:*:*:*:*:alpine_linux:*:3.2
• cpe:2.3:a:alpine:wpa_supplicant_alpine_package:2.5-r2:*:*:*:*:alpine_linux:*:3.2

External links

https://git.alpinelinux.org/aports/commit/?id=7da74780cb6ede70d4440b97f6a5878065b52889
https://git.alpinelinux.org/aports/commit/?id=5d9b6ee36295e84a95a5f48e7d226f6f2da265a7
https://git.alpinelinux.org/aports/commit/?id=212b275cc6b0023a8e0c903596134592f42b7fdb
https://git.alpinelinux.org/aports/commit/?id=32a110e3d9e36fa21fa678aed9b1ac4a9ddc6ac3
https://git.alpinelinux.org/aports/commit/?id=662ff3103b7273a29d47f90ac9e63cae39b4d000

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.