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AUSCERT External Security Bulletin Redistribution
ESB-2016.0208
A vulnerability in the GSKit component of Communications Server for Data
Center Deployment, AIX, Linux, System z, and Windows
28 January 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM Communications Server
Publisher: IBM
Operating System: AIX
Linux variants
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-0201
Reference: ESB-2016.0128
Original Bulletin:
http://www.ibm.com/support/docview.wss?uid=swg21974589
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A vulnerability in the GSKit component of Communications Server for Data
Center Deployment, AIX, Linux, System z, and Windows (CVE-2016-0201)
Security Bulletin
Document information
More support for:
Communications Server for Data Center Deployment
Software version:
7.0.0.0
Operating system(s):
AIX, Linux
Reference #:
1974589
Modified date:
2016-01-26
Summary
A vulnerability has been addressed in the GSKit component of Communication
Server family of products.
Vulnerability Details
CVEID:
CVE-2016-0201
DESCRIPTION:
IBM GSKit could allow a remote attacker to obtain sensitive information,
caused by a MD5 collision. An attacker could exploit this vulnerability to
obtain authentication credentials.
CVSS Base Score: 5.9
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/109310
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
This problem affects the following distributed Communications Server
products:
Product ID Product name
- ------------- --------------------
5725H32 Communications Server for Data Center Deployment 7.0
5639F25 Communications Server for Windows V6.4 ,
5765E51 Communications Server for AIX V6.4
5724I33 Communications Server for Linux V6.4
5724I34 Communications Server for Linux on System z V6.4
Remediation/Fixes
The following GSKit levels will support the CVE-2016-0201 for the MD5
collision vulnerability as well as all previously reported vulnerabilities.
Minimum level of GSKit for Communications Server for AIX V6.4, Communications
Server for Windows V6.4, Communications Server for Linux V6.4, Communications
Server for Linux on System z V6.4 and Communications Server for Data Center
Deployment V7 is:
GSKit 8.0-50.57
The recommended solution is to apply the Fix Pack or PTF for each named
product as soon as practical. Visit
Fix Central
to find these APARs (under Other Software brand).
Product VRMF APAR Remediation/First Fix
Communications Server for Data Center Deployment 7.0.0.3 LI78895 (Linux) APARs found under fix: OS-GSKIT8-57-UPDATE-7003-LINUX-UPDATE, OS-GSKIT8-57-UPDATE-7003-ZLINUX-UPDATE,
IV80074 (AIX) OS-GSKIT8-57-UPDATE-7003-AIX-UPDATE
( - package LI78895_gskit8_57_update.tgz for Linux (x86, ppc)
- package LI78895z_gskit8_57_update.tgz for Linux on System z
- package IV80074_gskit8_57_update.tar for AIX)
Communications Server for Windows 6.4.0.6 JR55055 APAR found under fix: OS-GSKIT8-57-UPDATE-6406-WINDOWS-UPDATE
( package package JR55055.zip)
Communications Server for AIX 6.4.0.6 IV80077 APAR found under fix: OS-GSKIT8-57-UPDATE-6406-AIX-UPDATE
( package IV80077_gskit8_57_update.tar)
Communications Server for Linux 6.4.0.6 LI78999 APAR found under fix: OS-GSKIT8-57-UPDATE-6406-LINUX-UPDATE
(package LI78899_gskit8_57_update.tgz)
Communications Server for Linux on System z 6.4.0.6 LI78996 APAR found under fix: OS-GSKIT8-57-UPDATE-6406-ZLINUX-UPDATE
- package LI78896_gskit8_57_update.tgz)
Workarounds and Mitigations
Disabling the TN3270 client from using TLS 1.2 will also mitigate the issue.
Get Notified about Future Security Bulletins
Subscribe to My Notifications to be notified of important product support
alerts like this.
Important note
IBM strongly suggests that all System z customers be subscribed to the System
z Security Portal to receive the latest critical System z security and
integrity service. If you are not subscribed, see the instructions on the
System z Security web site
Security and integrity APARs and associated fixes will be posted to this
portal. IBM suggests reviewing the CVSS scores and applying all security or
integrity fixes as soon as possible to minimize any potential risk.
References
Complete CVSS v3 Guide
On-line Calculator v3
Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Acknowledgement
none
Change History
Original version published 18 January, 2016
*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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