CVE-2024-30410 Junos OS: EX4300 Series: Loopback filter not blocking traffic despite having discard term.

Medium 6.9 Published 12 Apr 2024 Updated 2 Aug 2024

Attackers can bypass IPv6 loopback firewall filters on Juniper EX4300 switches, allowing traffic to reach the routing engine despite discard rules.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2024-30410?

CVE-2024-30410 is a medium-severity vulnerability in Juniper Junos, published on 12 Apr 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An Incorrect Behavior Order in the routing engine (RE) of Juniper Networks Junos OS on EX4300 Series allows traffic intended to the device to reach the RE instead of being discarded when the discard term is set in loopback (lo0) interface. The intended function is that the lo0 firewall filter takes precedence over the revenue interface firewall filter.

This issue affects only IPv6 firewall filter.

This issue only affects the EX4300 switch. No other products or platforms are affected by this vulnerability.

This issue affects Juniper Networks Junos OS:

* All versions before 20.4R3-S10, * from 21.2 before 21.2R3-S7, * from 21.4 before 21.4R3-S6.

Weakness: CWE-696

Which versions are affected by CVE-2024-30410?

It affects 1 product.

Products include Juniper Junos.

How do I fix CVE-2024-30410?

No fix has been published for CVE-2024-30410 yet. Limit exposure of the affected software until one is available.

Is CVE-2024-30410 being exploited?

There is no known exploitation of CVE-2024-30410 in the wild and no public exploit code.

All Juniper Junos vulnerabilities

Sources

Also known as GHSA-96r2-52xr-8x9x.