CVE-2022-22160: 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)

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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 SECURITY_ADVISORIES Last Updated: 12 Jan 2022Version: 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.”

Related Links

• 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-2022-22160 at cve.org

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