ESB-2018.1119 - [Juniper] mib2d: Denial of service - Remote/unauthenticated 2018-04-12

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1119
           Junos: Denial of service vulnerability in SNMP MIB-II
                  subagent daemon (mib2d) (CVE-2018-0019)
                               12 April 2018

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

Product:           mib2d
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0019  

Original Bulletin: 
   https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10847

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2018-04 Security Bulletin: Junos: Denial of service vulnerability in SNMP MIB-II
subagent daemon (mib2d) (CVE-2018-0019)


CVSS Score: 5.3 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
Risk Level: Medium
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."


Product Affected:

This issue affects Junos OS 12.1X46, 12.3, 12.3X48, 14.1, 14.1X53, 15.1,
15.1X49, 15.1X53, 16.1, 16.1X65, 16.1X70, 16.2, 17.1, 17.3, 17.4.


Problem:

A vulnerability in Junos OS SNMP MIB-II subagent daemon (mib2d) may allow a
remote network based attacker to cause the mib2d process to crash resulting in a
denial of service condition (DoS) for the SNMP subsystem.

While a mib2d process crash can disrupt the network monitoring via SNMP, it does
not impact routing, switching or firewall functionalities.

SNMP is disabled by default on devices running Junos OS.

Affected releases are Juniper Networks Junos OS:

    12.1X46 versions prior to 12.1X46-D76;
    12.3 versions prior to 12.3R12-S7, 12.3R13;
    12.3X48 versions prior to 12.3X48-D65;
    14.1 versions prior to 14.1R9;
    14.1X53 versions prior to 14.1X53-D130;
    15.1 versions prior to 15.1F2-S20, 15.1F6-S10, 15.1R7;
    15.1X49 versions prior to 15.1X49-D130;
    15.1X53 versions prior to 15.1X53-D233, 15.1X53-D471, 15.1X53-D472,
        15.1X53-D58, 15.1X53-D66;
    16.1 versions prior to 16.1R5-S3, 16.1R7;
    16.1X65 versions prior to 16.1X65-D47;
    16.1X70 versions prior to 16.1X70-D10;
    16.2 versions prior to 16.2R1-S6, 16.2R2-S5, 16.2R3;
    17.1 versions prior to 17.1R2-S6, 17.1R3;

This issue only affects systems with SNMP mib2d enabled. SNMP is disabled by
default on devices running Junos OS.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen in a production network.

This issue has been assigned CVE-2018-0019.


Solution:

The following software releases have been updated to resolve this specific
issue:12.3R12-S7, 12.3R13, 12.3X48-D65, 14.1R9, 14.1X53-D130, 15.1F2-S20,
15.1F6-S10, 15.1R7, 15.1X49-D130, 15.1X53-D233, 15.1X53-D471, 15.1X53-D472,
15.1X53-D58, 15.1X53-D66, 16.1R5-S3, 16.1R7, 16.1X65-D65, 16.1X70-D10,
16.2R1-S6, 16.2R2-S5, 16.2R3, 17.1R2-S6, 17.1R3, 17.2R1, and all subsequent
releases.

This issue is being tracked as 1241134 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:

Disable SNMP (disabled by default), utilize edge filtering with source-address
validation (uRPF, etc.), access control lists (ACLs), and/or SNMPv3
authentication to limit access to the device only from trusted hosts.


Implementation:

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


Modification History:

    2018-04-11: Initial Publication.

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