ESB-2019.0796 - [Win][UNIX/Linux] Power HMC: Access confidential data - Remote/unauthenticated 2019-03-13

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0796
   IBM Security Bulletin: Vulnerability in GnuTLS affects Power Hardware
            Management Console ( CVE-2018-10845 CVE-2018-10844)
                               13 March 2019

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

Product:           Power HMC
Publisher:         IBM
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-10845 CVE-2018-10844 

Reference:         ESB-2019.0545
                   ESB-2019.0513
                   ESB-2018.3904

Original Bulletin: 
   http://www.ibm.com/support/docview.wss?uid=ibm10794457

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Vulnerability in GnuTLS affects Power Hardware Management Console (
CVE-2018-10845 CVE-2018-10844)

Product:             Power HMC

Software version:    All Versions

Operating system(s): Platform Independent

Reference #:         0794457

Security Bulletin

Summary

It was found that GnuTLS's implementation of HMAC-SHA-384 and HMAC-SHA-256 was
vulnerable to a Lucky Thirteen-style attack. A remote attacker could use this
flaw to conduct distinguishing attacks and plain text recovery attacks via
statistical analysis of timing data using crafted packets.

Vulnerability Details

CVEID: CVE-2018-10845
DESCRIPTION: GnuTLS could allow a remote attacker to obtain sensitive
information, caused by a flaw in the implementation of HMAC-SHA-384 . By
sending a specially-crafted packet, a remote attacker could exploit this
vulnerability to obtain information.
CVSS Base Score: 5.9
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
148730 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)

CVEID: CVE-2018-10844
DESCRIPTION: GnuTLS could allow a remote attacker to obtain sensitive
information, caused by a flaw in the implementation of HMAC-SHA-256. By sending
a specially-crafted packet, a remote attacker could exploit this vulnerability
to obtain information.
CVSS Base Score: 5.9
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
148731 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)

Affected Products and Versions

Power HMC V8.7.0.0
Power HMC V9.1.910.0

Remediation/Fixes

Remediation/Fixes

The following fixes are available on IBM Fix Central at: http://www-933.ibm.com
/support/fixcentral/

+------------------------------+--------------------------+--------------------------+----------------------------------+
|           Product            |           VRMF           |           APAR           |         Remediation/Fix          |
+------------------------------+--------------------------+--------------------------+----------------------------------+
|          Power HMC           |    V8.8.7.2 PTF3 ppc     |         MB04193          |             MH01807              |
+------------------------------+--------------------------+--------------------------+----------------------------------+
|          Power HMC           |    V8.8.7.2 PTF3 x86     |         MB04192          |             MH01806              |
+------------------------------+--------------------------+--------------------------+----------------------------------+
|          Power HMC           |   V9.1.921.0 PTF3 ppc    |         MB04195          |             MH01809              |
+------------------------------+--------------------------+--------------------------+----------------------------------+
|          Power HMC           |   V9.1.920.0 PTF3 x86    |         MB04194          |             MH01808              |
+------------------------------+--------------------------+--------------------------+----------------------------------+

Workarounds and Mitigations

None

Reference

Complete CVSS v3 Guide
On-line Calculator v3

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Change History

Initial Version: 3 March 2019

*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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