ESB-2019.0088 - [Juniper] Juniper MX Series: Denial of service - Remote/unauthenticated 2019-01-10

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0088
2019-01 Security Bulletin: Junos OS: MX Series: uncontrolled recursion and
           crash in Broadband Edge subscriber management daemon
                        (bbe-smgd). (CVE-2019-0001)
                              10 January 2019

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Juniper MX Series
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-0001  

Original Bulletin: 
   https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10900

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2019-01 Security Bulletin: Junos OS: MX Series: uncontrolled recursion and 
crash in Broadband Edge subscriber management daemon (bbe-smgd). 
(CVE-2019-0001)

[JSA10900]

Product Affected:

This issue affects Junos OS 16.1, 16.2, 17.1, 17.2, 17.3, 17.4, 18.1, 18.2. 

Affected platforms: 

MX Series.

Problem:

Receipt of a malformed packet on MX Series devices with dynamic vlan 
configuration can trigger an uncontrolled recursion loop in the Broadband Edge
subscriber management daemon (bbe-smgd), and lead to high CPU usage and a 
crash of the bbe-smgd service. Repeated receipt of the same packet can result
in an extended denial of service condition for the device.

Affected releases are Juniper Networks Junos OS:

    16.1 versions prior to 16.1R7-S1;
    16.2 versions prior to 16.2R2-S7;
    17.1 versions prior to 17.1R2-S10, 17.1R3;
    17.2 versions prior to 17.2R3;
    17.3 versions prior to 17.3R3-S1;
    17.4 versions prior to 17.4R2;
    18.1 versions prior to 18.1R3;
    18.2 versions prior to 18.2R2.

This issue can only occur on MX Series devices with dynamic vlan configuration.

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-2019-0001.

Solution:

The following Junos OS releases have been updated to resolve this specific 
issue: 16.1R7-S1, 16.2R2-S7, 17.1R2-S10, 17.1R3, 17.2R3, 17.3R3-S1, 17.4R2, 
18.1R3, 18.2R2, 18.3R1, and all subsequent releases.

This issue is being tracked as PR 1356474 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).

Workaround:

There are no viable workarounds for this issue.

Implementation:
Software Releases, patches and updates are available at 
https://www.juniper.net/support/downloads/.

Modification History:

2019-01-09: Initial Publication.

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

CVSS Score:
7.5 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Risk Level:
High

Risk 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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