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AUSCERT External Security Bulletin Redistribution
ESB-2024.2227
2024-04 Security Bulletin: Junos OS: EX4300 Series: Loopback filter not
blocking traffic despite having discard term (CVE-2024-30410)
11 April 2024
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AusCERT Security Bulletin Summary
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Product: Junos OS
Publisher: Juniper Networks
Operating System: Juniper
Resolution: Patch/Upgrade
CVE Names: CVE-2024-30410
Original Bulletin:
https://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
Comment: CVSS (Max): 5.8 CVE-2024-30410 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N)
CVSS Source: Juniper Networks
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
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Article ID: JSA79100
Product Affected: This issue affects all versions of Junos before 20.4R3-S10,
21.2, 21.4. Affected platforms: EX4300.
Severity Level: Medium
CVSS Score: CVSS 3.1
Problem:
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 (ex. ge-0/0/0) 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 on EX4300:
o All versions before 20.4R3-S10,
o from 21.2 before 21.2R3-S7,
o from 21.4 before 21.4R3-S6.
This issue affects Junos OS device with IPv6 firewall filter configured for
both lo0 interface and revenue interface (ex- ge-0/0/0):
[firewall family inet6 filter]
Solution:
The following software releases have been updated to resolve this specific
issue: Junos OS: 20.4R3-S10, 21.2R3-S7, 21.4R3-S6, and all subsequent releases.
This issue is being tracked as 1775558 which is visible on the Customer Support
website.
Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of
Engineering (EOE) or End of Life (EOL).
Workaround:
When lo0 filter is applied before the revenue interface (ex. ge-0/0/0) filter
this issue could be avoided.
Modification History:
o 2024-04-10 - Initial Publication
Related Information:
o KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin
Publication Process
o KB16765: In which releases are vulnerabilities fixed?
o KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security
Advisories
o Report a Security Vulnerability - How to Contact the Juniper Networks
Security Incident Response Team
o https://www.cve.org/CVERecord?id=CVE-2024-30410
Last Updated: 2024-04-10
Created: 2024-04-10
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