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AUSCERT External Security Bulletin Redistribution
ESB-2024.2210
2024-04 Security Bulletin: Junos OS and Junos OS Evolved: A malformed BGP
tunnel encapsulation attribute will lead to an rpd crash
11 April 2024
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AusCERT Security Bulletin Summary
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Product: Junos OS
Junos OS Evolved
Publisher: Juniper Networks
Operating System: Juniper
Resolution: Patch/Upgrade
CVE Names: CVE-2024-30395
Original Bulletin:
https://supportportal.juniper.net/s/article/2024-04-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-A-malformed-BGP-tunnel-encapsulation-attribute-will-lead-to-an-rpd-crash-CVE-2024-30395
Comment: CVSS (Max): 7.5 CVE-2024-30395 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
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:U/C:N/I:N/A:H
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Article ID: JSA79095
Product Affected: This issue affects all versions of Junos OS earlier than
21.2R3-S7, 21.3, 21.4, 22.1, 22.2, 22.3, 22.4, 23.2. This issue affects all
versions of Junos OS Evolved earlier than 21.2R3-S7-EVO, 21.3-EVO, 21.4-EVO,
22.1-EVO, 22.2-EVO, 22.3-EVO, 22.4-EVO, 23.2-EVO.
Severity Level: High
CVSS Score: CVSS 3.1
Problem:
An Improper Check for Unusual or Exceptional Conditions vulnerability in
Routing Protocol Daemon (RPD) of Junos OS and Junos OS Evolved allows an
unauthenticated, network-based attacker to cause Denial of Service (DoS).
If a BGP update is received over an established BGP session which contains a
tunnel encapsulation attribute with a specifically malformed TLV, rpd will
crash and restart.
This issue affects:
Junos OS:
o All versions before 21.2R3-S7,
o from 21.3 before 21.3R3-S5,
o from 21.4 before 21.4R3-S5,
o from 22.1 before 22.1R3-S5,
o from 22.2 before 22.2R3-S3,
o from 22.3 before 22.3R3-S2,
o from 22.4 before 22.4R3,
o from 23.2 before 23.2R1-S2, 23.2R2.
Junos OS Evolved:
o All versions before 21.2R3-S7-EVO,
o from 21.3-EVO before 21.3R3-S5-EVO,
o from 21.4-EVO before 21.4R3-S5-EVO,
o from 22.2-EVO before 22.2R3-S3-EVO,
o from 22.3-EVO before 22.3R3-S2-EVO,
o from 22.4-EVO before 22.4R3-EVO,
o from 23.2-EVO before 23.2R1-S2-EVO, 23.2R2-EVO.
This is a related but separate issue from the one described in JSA75739.
To be exposed to this vulnerability BGP needs to be configured as in the
following example, but no further options need to be enabled:
[protocols bgp group <group> neighbor ...]
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was discovered during production use.
This issue has been assigned CVE-2024-30395 .
Solution:
The following software releases have been updated to resolve this specific
issue:
Junos OS: 21.2R3-S7, 21.3R3-S5, 21.4R3-S5, 22.1R3-S5, 22.2R3-S3, 22.3R3-S2,
22.4R3, 23.2R1-S2, 23.2R2, 23.4R1, and all subsequent releases.
Junos OS Evolved: 21.2R3-S7-EVO, 21.3R3-S5-EVO, 21.4R3-S5-EVO, 22.2R3-S3-EVO,
22.3R3-S2-EVO, 22.4R3-EVO, 23.2R1-S2-EVO, 23.2R2-EVO, 23.4R1-EVO, and all
subsequent releases.
This issue is being tracked as 1750441 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:
There are no available workarounds for this issue.
Modification History:
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-2024-30395
Last Updated: 2024-04-10
Created: 2024-04-10
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