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ESB-2015.2602 - [Juniper] Juniper products: Denial of service - Remote/unauthenticated

Date: 15 October 2015

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.2602
2015-10 Security Bulletin: Junos: Trio Chipset (Trinity) Denial of service
          due to maliciously crafted uBFD packet. (CVE-2015-7748)
                              15 October 2015

===========================================================================

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

Product:           Juniper MX-Series
                   Juniper EX 9200
                   Juniper TXP with T-4000 Trio
                   Juniper T-4000
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-7748  

Original Bulletin: 
   http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10701

- --------------------------BEGIN INCLUDED TEXT--------------------

2015-10 Security Bulletin: Junos: Trio Chipset (Trinity) Denial of service due
to maliciously crafted uBFD packet. (CVE-2015-7748)

Categories:

    TX Matrix Plus

    Junos

    Router Products

    MX-series

    TX Matrix

    Switch Products

    T4000

    EX9208

    EX9204

    EX9214

Security Advisories ID: JSA10701

Last Updated: 14 Oct 2015

Version: 2.0

Product Affected:

Any chassis with Trio (Trinity) chipset line cards: MX-Series, EX 9200, TXP 
with T-4000 Trio (Trinity) chipset line cards, T-4000.

Problem:

A remote attacker can cause a denial of service to the Trio Chipset (Trinity)
MPC due to maliciously crafted uBFD packets that are received directly, via 
VPN, MPLS, multicast, broadcast, on vt-interfaces, or otherwise.

This issue affects both IPv4 and IPv6 traffic in both ethernet, and 
non-ethernet physical environments, such as ATM, or SONET, where the crafted 
packet is received over physical interfaces.

If processed from a DPC through to the MPC then in-transit traffic will not be
susceptible.

In 6PE scenario, if the system is not using LSI/vt then not susceptible.

If processed via MPC line card will be affected, the MPC line card will crash.

If processed via endpoint receiving MPC line card terminating tunneling 
protocols such as MPLS/IPSec VPNs, etc. will be affected, this is considered 
in-transit traffic scenario.

This crash can happen when the crafted packet is directed directly to the lo0
interface IP/physical interface IP/broadcast IPv4 / IPv6 address of the 
Physical interface

This issue is assigned CVE-2015-7748.

Solution:

This issue does not apply to Junos OS 13.2 or lower.

The following software releases have been updated to resolve this specific 
issue: Junos OS 13.3R8, 14.1R6, 14.2R5, 15.1R2, 15.1F3, and all subsequent 
releases.

This issue is being tracked as PR 1102581 and is visible on the Customer 
Support website.

KB16765 - "In which releases are vulnerabilities fixed?" describes which 
release vulnerabilities are fixed as per our End of Engineering and End of 
Life support policies.

Workaround:

A workaround to apply a control plane (lo0) filter to drop uBFD packets in a 
layered defense approach may be implemented.


For IPv4 packets the following filter may be applied to lo0 interfaces:

family inet {
     filter ubfd {
         term 1 {
             from {
                 protocol udp;
                 destination-port 6784;
             }
             then {
                 discard;
             }
         }
         term 2 {
             then accept;
         }
     }
}

For IPv6 packets the following filter may be applied to lo0 interfaces:

family inet6 {
     filter ufbd-v6 {
         term 1 {
             from {
                 next-header udp;
                 destination-port 6784;
             }
             then {
                 count ufdb-v6;
                 discard;
             }
         }
         term 2 {
             then accept;
         }
     }
}

For IPv4 packets the following filter may be applied to lo0 interfaces:

Implementation:

How to obtain fixed software:

Security vulnerabilities in Junos are fixed in the next available Maintenance
Release of each supported Junos version. In some cases, a Maintenance Release
is not planned to be available in an appropriate time-frame. For these cases,
Service Releases are made available in order to be more timely. Security 
Advisory and Security Notices will indicate which Maintenance and Service 
Releases contain fixes for the issues described. Upon request to JTAC, 
customers will be provided download instructions for a Service Release. 
Although Juniper does not provide formal Release Note documentation for a 
Service Release, a list of "PRs fixed" can be provided on request.

Modification History:

2015-10-14: 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 Vulnerability - How to Contact the Juniper Networks Security 
Incident Response Team

    A mapping between chipset type and PFE module

    CVE-2015-7748: Trio Chipset (Trinity) Denial of service due to maliciously
crafted uBFD packet.

CVSS Score: 5.9 (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)

Risk Level: Medium

Risk Assessment: Information for how Juniper Networks uses CVSS can be found 
at KB16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security
Advisories"

- --------------------------END INCLUDED TEXT--------------------

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
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                On call after hours for member emergencies only.
===========================================================================
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