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             AUSCERT External Security Bulletin Redistribution

      Out of Cycle Security Bulletin: Multiple vulnerabilities in NTP
                              6 January 2015


        AusCERT Security Bulletin Summary

Product:           Junos OS
                   NSM Series Appliances
Publisher:         Juniper Networks
Operating System:  Juniper
                   Network Appliance
                   Linux variants
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Access Privileged Data          -- Existing Account      
                   Denial of Service               -- Remote/Unauthenticated
                   Provide Misleading Information  -- Existing Account      
                   Reduced Security                -- Existing Account      
Resolution:        Patch/Upgrade
CVE Names:         CVE-2014-9296 CVE-2014-9295 CVE-2014-9294

Reference:         ESB-2014.2519

Original Bulletin: 

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Out of Cycle Security Bulletin: Multiple vulnerabilities in NTP


    SIRT Advisory

Security Advisories ID:		JSA10663

Last Updated:	05 Jan 2015
Version:	1.0

Product Affected:
Junos OS, NSM Series devices, NSMXpress and NSM server software.


NTP.org has published a security advisory for six vulnerabilities resolved in
ntpd (NTP daemon) that have been assigned four CVE IDs. In the worst case,
some of these issues may allow remote unauthenticated attackers to execute
code with the privileges of ntpd or cause a denial of service condition.

CVE		CVSS v2 base score			Summary
CVE-2014-9295 	7.5 (AV:N/AC:L/Au:N/C:P/I:P/A:P) 	Three stack-based buffer overflows in ntpd.
CVE-2014-9293 	5.0 (AV:N/AC:L/Au:N/C:N/I:P/A:N) 	When an auth key is not configured ntpd generates a weak default key.
CVE-2014-9294 	5.0 (AV:N/AC:L/Au:N/C:N/I:P/A:N) 	The ntp-keygen utility in NTP before 4.2.7p230 create cryptographically weak symmetric keys.
CVE-2014-9296 	0.0 (AV:N/AC:L/Au:N/C:N/I:N/A:N) 	ntpd continues to execute after detecting a certain authentication error. This issue has an unknown impact.

Vulnerable Products:

    Junos OS: Junos is confirmed to be vulnerable to one of the three buffer
    overflow issues covered by CVE-2014-9295. This is only exploitable
    on systems where NTP server is enabled within the [edit system ntp]
    hierarchy level. The remaining three CVEs are being evaluated.
    NSM: NSM software, NSMXpress and NSM Series Appliances are vulnerable
    to these issues if the "Automatically Sync Time" option (under Time
    Server settings in the Web UI) is checked. This is off by default. NSM
    server software installed on generic Linux or Solaris servers may
    require NTP fixes from the respective server OS vendor.

Products not vulnerable:

    ScreenOS is not vulnerable. The NTP module in ScreenOS was designed
    and coded by Juniper Networks. It is not based on ntpd from NTP Project.
    Pulse Secure (IC/MAG/SA, etc.) products are not vulnerable. The
    Pulse Secure products do not include NTP server functionality and are
    therefore not vulnerable to these issues.

As new information becomes available on products that are not listed above,
this document will be updated.

This section will be updated when fixes for the vulnerabilities are


Junos OS: Standard security best current practices (control plane firewall
filters, edge filtering, access lists, etc.) will protect against any
remote malicious attacks against NTP. Customers who have already applied
the workaround described in JSA10613 are already protected against any
remote exploitation of these vulnerabilities. Refer to the Workaround
section of JSA10613 for specific applicable mitigation techniques.

NSM: Turning off NTP daemon by unchecking the "Automatically Sync Time"
option (under Time Server settings in Web UI) should completely mitigate
these issues.


Modification History:

2015-01-05: Initial release.

Related Links:

    KB16613: Overview of the Juniper Networks SIRT Monthly 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

    NTP Project "Recent Vulnerabilities" Security Notice

CVSS Score:
7.5 (AV:N/AC:L/Au:N/C:P/I:P/A:P)

Risk Level:

Risk Assessment:
These issues may allow remote unauthenticated attackers to execute code
with the privileges of ntpd or cause a denial of service condition


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