Firewall rules bypass in Junos OS on EX4300

Published: 2024-04-12

Risk	Medium
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2024-30410
CWE-ID	CWE-696
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Juniper Junos OS Operating systems & Components / Operating system
Vendor	Juniper Networks, Inc.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Incorrect behavior order

EUVDB-ID: #VU88488

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-30410

CWE-ID: CWE-696 - Incorrect Behavior Order

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to an incorrect behavior order error in the routing engine (RE) of Juniper Networks Junos OS on EX4300 Series, which allows traffic intended to the device to reach the RE instead. A remote attacker can send specially crafted IPv6 packets to the device and bypass implemented firewall rules.

Note, the vulnerability affects only EX4300 switch.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 20.4R1 - 21.4R3-S5

External links

http://supportportal.juniper.net/s/article/2024-04-Security-Bulletin-Junos-OS-EX4300-Series-Loopback-filter-not-blocking-traffic-despite-having-discard-term-CVE-2024-30410

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.