ESB-2017.2696 - [AIX] IBM PureApplication System: Denial of service - Remote/unauthenticated 2017-10-25

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2696
 Security Bulletin: Network Time Protocol (NTP) vulnerability in AIX which
  is used by IBM OS Images in IBM PureApplication Systems (CVE-2016-9310)
                              25 October 2017

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

Product:           IBM PureApplication System
Publisher:         IBM
Operating System:  AIX
Impact/Access:     Denial of Service        -- Remote/Unauthenticated
                   Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-9310  

Reference:         ESB-2017.2080
                   ESB-2017.1681
                   ESB-2017.1410
                   ESB-2017.0354
                   ESB-2017.0109
                   ESB-2016.3091

Original Bulletin: 
   http://www.ibm.com/support/docview.wss?uid=swg22009301

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Security Bulletin: Network Time Protocol (NTP) vulnerability in AIX which is
used by IBM OS Images in IBM PureApplication Systems (CVE-2016-9310)

Document information

More support for: PureApplication System
Security

Software version: 2.1.0.0, 2.1.0.1, 2.1.0.2, 2.1.1.0, 2.1.2.0, 2.1.2.1,
2.1.2.2, 2.1.2.3, 2.1.2.4, 2.2.0.0, 2.2.1.0, 2.2.2.0, 2.2.2.1, 2.2.2.2,
2.2.3.0, 2.2.3.1, 2.2.3.2, 2.2.4.0

Operating system(s): AIX

Reference #: 2009301

Modified date: 24 October 2017

Security Bulletin

Summary

There are vulnerabilities in the Network Time Protocol (NTP) in AIX that is
used by the OS Images for IBM PureApplication Software Suite, IBM Bluemix Local
System and IBM PureApplication System/Software

Vulnerability Details

CVEID: CVE-2016-9310
DESCRIPTION: NTP is vulnerable to a denial of service, caused by an error in
the control mode (mode 6) functionality. By sending specially crafted control
mode packets, a remote attacker could exploit this vulnerability to obtain
sensitive information and cause the application to crash.
CVSS Base Score: 6.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
119087 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L)

Affected Products and Versions

IBM PureApplication System V2.1
IBM PureApplication System V2.2

Remediation/Fixes

Use workaround below.

Workarounds and Mitigations

The deployed AIX-based virtual machines on IBM PureApplication System types are
affected. The solution is to apply the following workaround:

1. Edit the /etc/ntp.conf file to include the line:
restrict -4 default nomodify nopeer noquery notrap
restrict -6 default nomodify nopeer noquery notrap

2. Stop and restart the xntpd service:
stopsrc -s xntpd
startsrc -s xntpd

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alerts like this.

References

Complete CVSS v3 Guide
On-line Calculator v3

Related information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Change History

November 24, 2017: Original document published

*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the impact of
this vulnerability in their environments by accessing the links in the
Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the
Common Vulnerability Scoring System (CVSS) is an "industry open standard
designed to convey vulnerability severity and help to determine urgency and
priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF
ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY
ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

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