Denial of service in FreeBSD

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

FreeBSD: 5.3 - 11.1

Linux kernel: 4.12.6

CPE2.3

• cpe:2.3:o:freebsd_foundation:freebsd:5.3:*:*:*:*:*:*:*
• cpe:2.3:o:freebsd_foundation:freebsd:5.4:*:*:*:*:*:*:*
• cpe:2.3:o:freebsd_foundation:freebsd:5.5:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.12.6:*:*:*:*:*:*:*

External links

https://www.freebsd.org/security/advisories/FreeBSD-SA-18:11.hostapd.asc

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.