Juniper Junos OS: 2024-07 Security Bulletin: Junos OS and Junos OS Evolved: Receipt of a specific malformed BGP update causes the session to reset (JSA83015) (CVE-2024-39555)

Juniper Junos OS: 2024-07 Security Bulletin: Junos OS and Junos OS Evolved: Receipt of a specific malformed BGP update causes the session to reset (JSA83015) (CVE-2024-39555)

Severity

8

CVSS

(AV:N/AC:L/Au:N/C:N/I:N/A:C)

Published

07/10/2024

Created

07/12/2024

Added

07/11/2024

Modified

01/28/2025

Description

An Improper Handling of Exceptional Conditions vulnerability in the Routing Protocol Daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an attacker sending a specific malformed BGP update message to cause the session to reset, resulting in a Denial of Service (DoS).Continued receipt and processing of these malformed BGP update messages will create a sustained Denial of Service (DoS) condition. Upon receipt of a BGP update message over an established BGP session containing a specifically malformed tunnel encapsulation attribute, when segment routing is enabled, internal processing of the malformed attributes within the update results in improper parsing of remaining attributes, leading to session reset: BGP SEND Notification code 3 (Update Message Error) subcode 1 (invalid attribute list) Only systems with segment routing enabled are vulnerable to this issue. This issue affects eBGP and iBGP, in both IPv4 and IPv6 implementations, and requires a remote attacker to have at least one established BGP session. This issue affects: Junos OS: *All versions before 21.4R3-S8, *from 22.2 before 22.2R3-S4, *from 22.3 before 22.3R3-S3, *from 22.4 before 22.4R3-S3, *from 23.2 before 23.2R2-S1, *from 23.4 before 23.4R1-S2, 23.4R2. Junos OS Evolved:  *All versions before 21.4R3-S8-EVO, *from 22.2-EVO before 22.2R3-S4-EVO, *from 22.3-EVO before 22.3R3-S3-EVO, *from 22.4-EVO before 22.4R3-S3-EVO, *from 23.2-EVO before 23.2R2-S1-EVO, *from 23.4-EVO before 23.4R1-S2-EVO, 23.4R2-EVO.

Solution(s)

• juniper-junos-os-upgrade-latest

References

• https://attackerkb.com/topics/cve-2024-39555
• CVE - 2024-39555
• JSA83015