KRACK attack in Linux kernel

1) Key management errors

EUVDB-ID: #VU8840

Risk: Medium

CVSSv3.1: 9.1 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:U/RC:C]

CVE-ID: CVE-2017-13080

CWE-ID: CWE-320 - Key Management Errors

Exploit availability: No

Description

The vulnerability allows an adjacent attacker to force a supplicant to reinstall a previously used group key.

The weakness exists in the processing of the 802.11i 4-way handshake messages of the WPA and WPA2 protocols due to ambiguities in the processing of associated protocol messages. An adjacent attacker can use man-in-the-middle techniques to retransmit previously used message exchanges between supplicant and authenticator.

The vulnerability is dubbed "KRACK" attack.

Mitigation

Update Linux kernel to version 4.13.14 or 4.9.63.

Vulnerable software versions

Linux kernel: 3.18 - 4.13.13

External links

http://www.krackattacks.com/
http://papers.mathyvanhoef.com/ccs2017.pdf

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.