CVE-2018-0026 Junos OS: Stateless IP firewall filter rules stop working as expected after reboot or upgrade

Medium 4.7 Published 11 Jul 2018 Updated 16 Sep 2024

Stateless IP firewall filters fail to apply after reboot or upgrade, allowing unauthorized network traffic to bypass security controls.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2018-0026?

CVE-2018-0026 is a medium-severity vulnerability in Juniper Junos, published on 11 Jul 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

After Junos OS device reboot or upgrade, the stateless firewall filter configuration may not take effect. This issue can be verified by running the command: user@re0> show interfaces <interface_name> extensive | match filters" CAM destination filters: 0, CAM source filters: 0 Note: when the issue occurs, it does not show the applied firewall filter. The correct output should show the applied firewall filter, for example: user@re0> show interfaces <interface_name> extensive | match filters" CAM destination filters: 0, CAM source filters: 0 Input Filters: FIREWAL_FILTER_NAME-<interface_name> This issue affects firewall filters for every address family. Affected releases are Juniper Networks Junos OS: 15.1R4, 15.1R5, 15.1R6 and SRs based on these MRs. 15.1X8 versions prior to 15.1X8.3.

Which versions are affected by CVE-2018-0026?

It affects 1 product.

Products include Juniper Junos.

How do I fix CVE-2018-0026?

No fix has been published for CVE-2018-0026 yet. Limit exposure of the affected software until one is available.

Is CVE-2018-0026 being exploited?

There is no known exploitation of CVE-2018-0026 in the wild and no public exploit code.

All Juniper Junos vulnerabilities

Sources

Also known as GHSA-4438-62q8-6hf2.