Vulnerability identifier: #VU14295
Vulnerability risk: Low
CVSSv3.1: 6.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]
CVE-ID:
CWE-ID:
CWE-20
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
wpa_supplicant
Server applications /
Encryption software
Vendor: 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.
Mitigation
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.
Vulnerable software versions
wpa_supplicant: 2.0.0 - 2.6
External links
http://w1.fi/security/2018-1/unauthenticated-eapol-key-decryption.txt
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.