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ESB-2015.2605 - [Juniper] Juniper ScreenOS: Denial of service - Remote/unauthenticated

Date: 15 October 2015

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

                               ESB-2015.2605
       2015-10 Security Bulletin: ScreenOS: Network based denial of
             service vulnerability in ScreenOS (CVE-2015-7750)
                              15 October 2015

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

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

Product:           Juniper ScreenOS
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-7750  

Original Bulletin: 
   http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10704

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

2015-10 Security Bulletin: ScreenOS: Network based denial of service 
vulnerability in ScreenOS (CVE-2015-7750)

Categories:

    Firewalls ISG/NS/SSG Series

    ScreenOS

    SIRT Advisory

Security Advisories ID: JSA10704

Last Updated: 14 Oct 2015

Version: 1.0

Product Affected:

This issue can affect any Netscreen and ScreenOS Series products running 
ScreenOS.

Problem:

A vulnerability in ScreenOS L2TP packet processing may allow a remote network
based attacker to cause a denial of service condition on ScreenOS devices by 
sending a crafted L2TP packet.

This issue is assigned CVE-2015-7750.

Solution:

This issue has been resolved in ScreenOS 6.3.0r13-dnd1 and 6.3.0r18-dnc1.

This issue is being tracked as PR 1086779 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:

On ScreenOS 6.3.0 this issue can be mitigated by not configuring L2TP 
settings.

Implementation:

How to obtain fixed software:

Software release Service Packages are available at http://support.juniper.net
from the "Download Software" links. Select your appropriate Selected Products,
or browse by Series or Technology, once you find the appropriate fixed 
version(s) for your needed platform download and apply the updated version(s)
of choice.

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 Security Vulnerability - How to Contact the Juniper Networks 
    Security Incident Response Team

    CVE-2015-7750

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 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
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
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