CVE-2018-0021 Junos OS: Short MacSec keys may allow man-in-the-middle attacks.

High 8.8 Published 11 Apr 2018 Updated 17 Sep 2024

Short MacSec keys in Junos OS allow attackers to discover secrets via brute-force, enabling man-in-the-middle attacks.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2018-0021?

CVE-2018-0021 is a high-severity vulnerability in Juniper Junos, published on 11 Apr 2018. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

If all 64 digits of the connectivity association name (CKN) key or all 32 digits of the connectivity association key (CAK) key are not configured, all remaining digits will be auto-configured to 0. Hence, Juniper devices configured with short MacSec keys are at risk to an increased likelihood that an attacker will discover the secret passphrases configured for these keys through dictionary-based and brute-force-based attacks using spoofed packets. Affected releases are Juniper Networks Junos OS: 14.1 versions prior to 14.1R10, 14.1R9; 14.1X53 versions prior to 14.1X53-D47; 15.1 versions prior to 15.1R4-S9, 15.1R6-S6, 15.1R7; 15.1X49 versions prior to 15.1X49-D100; 15.1X53 versions prior to 15.1X53-D59; 16.1 versions prior to 16.1R3-S8, 16.1R4-S8, 16.1R5; 16.2 versions prior to 16.2R1-S6, 16.2R2; 17.1 versions prior to 17.1R2.

Which versions are affected by CVE-2018-0021?

It affects 1 product.

Products include Juniper Junos.

How do I fix CVE-2018-0021?

No fix has been published for CVE-2018-0021 yet. Limit exposure of the affected software until one is available.

Is CVE-2018-0021 being exploited?

There is no known exploitation of CVE-2018-0021 in the wild and no public exploit code.

All Juniper Junos vulnerabilities

Sources

Also known as GHSA-cm2c-mr99-4v22.