#VU14295 Improper input validation in wpa_supplicant - CVE-2018-14526
Published: August 9, 2018 / Updated: August 9, 2018
Vulnerability identifier: #VU14295
Vulnerability risk: Low
CVSSv4.0: 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
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
wpa_supplicant
wpa_supplicant
Software vendor:
Jouni Malinen
Jouni Malinen
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.
Remediation
The vendor offers possible mitigation steps:
- Remove TKIP as an allowed pairwise cipher in RSN/WPA2 networks. This
can be done also on the AP side.
- Merge the following commits to wpa_supplicant and rebuild:
WPA: Ignore unauthenticated encrypted EAPOL-Key data
- Update to wpa_supplicant v2.7 or newer, once available.
- Remove TKIP as an allowed pairwise cipher in RSN/WPA2 networks. This
can be done also on the AP side.
- Merge the following commits to wpa_supplicant and rebuild:
WPA: Ignore unauthenticated encrypted EAPOL-Key data
- Update to wpa_supplicant v2.7 or newer, once available.