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AUSCERT External Security Bulletin Redistribution
ESB-2022.0156
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
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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-2022-22160
Original Bulletin:
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11268
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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.
Problem:
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 .
Solution:
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 .
Workaround:
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
separately.
...
interface pp0.0; <<<<<
...
}
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:
6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Severity Level:
Medium
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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