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AUSCERT External Security Bulletin Redistribution
ESB-2022.0157
JSA11269 - 2022-01 Security Bulletin: Junos OS: MX104 might become
unresponsive if the out-of-band management port receives a
flood of traffic (CVE-2022-22161)
13 January 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Junos OS
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2022-22161
Original Bulletin:
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11269
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2022-01 Security Bulletin: Junos OS: MX104 might become unresponsive if the out-of-band management port receives a flood of traffic (CVE-2022-22161)
Article ID : JSA11269
Last Updated: 12 Jan 2022
Version : 1.0
Product Affected:
This issue affects all versions of Junos OS. Affected platforms: MX104.
Problem:
An Uncontrolled Resource Consumption vulnerability in the kernel of Juniper
Networks Junos OS allows an unauthenticated network based attacker to cause
100% CPU load and the device to become unresponsive by sending a flood of
traffic to the out-of-band management ethernet port.
Continued receipted of a flood will create a sustained Denial of Service (DoS)
condition. Once the flood subsides the system will recover by itself.
An indication that the system is affected by this issue would be that an irq
handled by the fman process is shown to be using a high percentage of CPU
cycles like in the following example output:
user@host> show system processes extensive
...
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU COMMAND
31 root -84 -187 0K 16K WAIT 22.2H 56939.26% irq96: fman0
This issue affects Juniper Networks Junos OS:
o All versions prior to 18.3R3-S6;
o 18.4 versions prior to 18.4R2-S9, 18.4R3-S9;
o 19.1 versions prior to 19.1R2-S3, 19.1R3-S7;
o 19.2 versions prior to 19.2R1-S7, 19.2R3-S3;
o 19.3 versions prior to 19.3R2-S7, 19.3R3-S4;
o 19.4 versions prior to 19.4R2-S5, 19.4R3-S5;
o 20.1 versions prior to 20.1R3-S1;
o 20.2 versions prior to 20.2R3-S2;
o 20.3 versions prior to 20.3R3-S1;
o 20.4 versions prior to 20.4R2-S2, 20.4R3;
o 21.1 versions prior to 21.1R2;
o 21.2 versions prior to 21.2R1-S1, 21.2R2.
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was seen during production usage.
This issue has been assigned CVE-2022-22161 .
Solution:
The following software releases have been updated to resolve this specific
issue: 18.3R3-S6, 18.4R2-S9, 18.4R3-S9, 19.1R2-S3, 19.1R3-S7, 19.2R1-S7,
19.2R3-S3, 19.3R2-S7, 19.3R3-S4, 19.4R2-S5, 19.4R3-S5, 20.1R3-S1, 20.2R3-S2,
20.3R3-S1, 20.4R2-S2, 20.4R3, 21.1R2, 21.2R1-S1, 21.2R2, 21.3R1, and all
subsequent releases.
This issue is being tracked as 1585829 .
Workaround:
There are no viable workarounds for this issue.
Implementation:
Software releases or updates are available for download at https://
support.juniper.net/support/downloads/
Modification History:
2022-01-12: Initial Publication.
CVSS Score:
7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Severity Level:
High
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."
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