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AUSCERT External Security Bulletin Redistribution
ESB-2022.5645
Junos OS and Junos OS Evolved: In a BGP multipath scenario, when one of the
contributing routes is flapping often and rapidly, rpd may
crash (CVE-2022-22225)
8 November 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Junos OS
Junos OS evolved
Publisher: Juniper Networks
Operating System: Juniper
Resolution: Patch/Upgrade
CVE Names: CVE-2022-22225
Original Bulletin:
https://supportportal.juniper.net/s/article/2022-10-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-In-a-BGP-multipath-scenario-when-one-of-the-contributing-routes-is-flapping-often-and-rapidly-rpd-may-crash-CVE-2022-22225
Comment: CVSS (Max): 5.9 CVE-2022-22225 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVSS Source: NVD
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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Article ID: JSA69875
Product Affected: This issue affects Junos OS 19.2, 20.2, 20.3, 20.4, 21.1,
21.2, 21.3. This issue affects all versions of Junos OS Evolved.
Severity Level: Medium
CVSS Score: 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
Problem:
A Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in the
Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved
allows an unauthenticated attacker with an established BGP session to cause a
Denial of Service (DoS).
In a BGP multipath scenario, when one of the contributing routes is flapping
often and rapidly, rpd may crash. As this crash depends on whether a route is a
contributing route, and on the internal timing of the events triggered by the
flap this vulnerability is outside the direct control of a potential attacker.
This issue affects:
Juniper Networks Junos OS
19.2 versions prior to 19.2R3-S6;
20.2 versions prior to 20.2R3-S4;
20.3 versions prior to 20.3R3-S3;
20.4 versions prior to 20.4R3-S4;
21.1 versions prior to 21.1R3;
21.2 versions prior to 21.2R2;
21.3 versions prior to 21.3R2.
Juniper Networks Junos OS Evolved
All versions prior to 20.4R3-S4-EVO;
21.1-EVO version 21.1R1-EVO and later versions;
21.2-EVO versions prior to 21.2R2-EVO;
21.3-EVO versions prior to 21.3R2-EVO.
This issue does not affect:
Juniper Networks Junos OS versions 19.2 versions prior to 19.2R2, 19.3R1 and
above prior to 20.2R1.
Juniper Networks Junos OS Evolved versions prior to 20.2R1-EVO.
A device can only be affected if the following BGP multipath configuration is
in place:
[protocols bgp ... multipath]
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was found during internal product security testing or research.
This issue has been assigned CVE-2022-22225.
Solution:
The following software releases have been updated to resolve this specific
issue:
Junos OS: 19.2R3-S6, 20.2R3-S4, 20.3R3-S3, 20.4R3-S4, 21.1R2, 21.2R2, 21.3R2,
21.4R1, and all subsequent releases.
Junos OS Evolved: 20.4R3-S4-EVO, 21.2R2-EVO, 21.3R2-EVO, 21.4R1-EVO, and all
subsequent releases.
This issue is being tracked as PR 1611128 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).
IMPLEMENTATION:
Software Releases, patches and updates are available at
https://support.juniper.net/support/downloads/.
Workaround:
There are no viable workarounds for this issue.
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common
Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."
Modification History:
2022-10-12: Initial Publication.
Related Information:
KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin
Publication Process
KB16765: In which releases are vulnerabilities fixed?
KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security
Advisories
Report a Security Vulnerability - How to Contact the Juniper Networks
Security Incident Response Team
CVE-2022-22225 at cve.mitre.org
Last Updated: 2022-10-12
Created: 2022-10-12
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