MitM attack in GENEVE tunnel implementation in Linux kernel

1) Cleartext transmission of sensitive information

EUVDB-ID: #VU51546

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-25645

CWE-ID: CWE-319 - Cleartext Transmission of Sensitive Information

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to traffic passed between two Geneve endpoints with configured IPsec can be unencrypted for the specific UDP port. A remote attacker with ability to intercept network traffic can gain access to sensitive data.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 5.9 rc1 - 5.9 rc6

External links

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00035.html
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html
http://packetstormsecurity.com/files/161229/Kernel-Live-Patch-Security-Notice-LSN-0074-1.html
http://bugzilla.redhat.com/show_bug.cgi?id=1883988
http://lists.debian.org/debian-lts-announce/2020/10/msg00028.html
http://lists.debian.org/debian-lts-announce/2020/12/msg00027.html
http://security.netapp.com/advisory/ntap-20201103-0004/
http://www.debian.org/security/2020/dsa-4774

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.