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  JSA11268 - 2022-01 Security Bulletin: Junos OS: MX Series: The bbe-smgd
 process crashes if an unsupported configuration exists and a PPPoE client
                 sends a specific message (CVE-2022-22160)
                              13 January 2022


        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-2022-22160  

Original Bulletin: 

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2022-01 Security Bulletin: Junos OS: MX Series: The bbe-smgd process crashes if an unsupported configuration exists and a PPPoE client sends a specific message (CVE-2022-22160)

Article ID  : JSA11268
Last Updated: 12 Jan 2022
Version     : 1.0

Product Affected:
This issue affects Junos OS 18.4, 19.1, 19.2, 19.3, 19.4, 20.1, 20.2, 20.3,
20.4, 21.1, 21.2. Affected platforms: MX Series.

An Unchecked Error Condition vulnerability in the subscriber management daemon
(smgd) of Juniper Networks Junos OS allows an unauthenticated adjacent attacker
to cause a crash of and thereby a Denial of Service (DoS).

In a subscriber management / broadband edge environment if a single session
group configuration contains dual-stack and a pp0 interface, smgd will crash
and restart every time a PPPoE client sends a specific message.

This issue affects Juniper Networks Junos OS on MX Series:

16.1 version 16.1R1 and later versions prior to 18.4R3-S10;

19.1 versions prior to 19.1R2-S3, 19.1R3-S7;

19.2 versions prior to 19.2R1-S8, 19.2R3-S4;

19.3 versions prior to 19.3R3-S4;

19.4 versions prior to 19.4R3-S5;

20.1 versions prior to 20.1R3-S3;

20.2 versions prior to 20.2R3-S3;

20.3 versions prior to 20.3R3-S2;

20.4 versions prior to 20.4R3;

21.1 versions prior to 21.1R3;

21.2 versions prior to 21.2R2.

This issue does not affect Juniper Networks Junos OS versions prior to 16.1R1.

The following is an example of an affected configuration:

user@device# show system services dhcp-local-server dhcpv6
group <group-name1> {
overrides {
dual-stack <dual-stack-group-name>;
interface pp0.0;

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-2022-22160 .


The following software releases have been updated to resolve this specific
issue: 18.4R3-S10, 19.1R2-S3, 19.1R3-S7, 19.2R1-S8, 19.2R3-S4, 19.3R3-S4,
19.4R3-S5, 20.1R3-S3, 20.2R3-S3, 20.3R3-S2, 20.4R3, 21.1R3, 21.2R2, 21.3R1, and
all subsequent releases.

This issue is being tracked as 1580528 .


Remove the pp0 interface from a DHCPv6 dual-stack group and move to its own
group with no dual-stack enabled.

user@device# show system services dhcp-local-server dhcpv6
group <group-name1> {
overrides {
dual-stack <dual-stack-group-name>;
interface pp0.0; <<<<< delete and add to new group
group <group-name2> { <<<<< new group for PP0 interfaces to be handled
interface pp0.0; <<<<<
Software releases or updates are available for download at https://
Modification History:
2022-01-12: Initial Publication.
CVSS Score:
6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Severity Level:
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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