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AUSCERT External Security Bulletin Redistribution
ESB-2016.0150
A vulnerability in the GSKit component of Communications Server for Data
Center Deployment, Communications Server for AIX, Communications Server for
Linux, Communications Server for Linux on System z,
Communications Server for Windows
21 January 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM Communications Server
Publisher: IBM
Operating System: AIX
Linux variants
Windows
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-0201
Reference: ESB-2016.0128
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21974589
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Security Bulletin: A vulnerability in the GSKit component of Communications
Server for Data Center Deployment, Communications Server for AIX,
Communications Server for Linux, Communications Server for Linux on System z,
Communications Server for Windows
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:
2016-01-19
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
VERSIONS AFFECTED:
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 ID Product name
- ------------- --------------------
5725H32 Communications Server for Data Center Deployment 7.0
- - APAR IV80074 (package IV80074_gskit8_57_update.tar) for AIX
- - APAR LI78895 (package LI78895_gskit8_57_update.tgz) for Linux (x86, ppc)
(package LI78895z_gskit8_57_update.tgz) for Linux on System z
- - apply the latest GSKit update package for level 7.0.0.3 on AIX or Linux
plaform
5765E51 Communications Server for AIX V6.4
- - APAR IV80077 (package IV80077_gskit8_57_update.tar) for AIX
- - apply the latest GSKit update package for level 6.4.0.6 on AIX platform
5724I33 Communications Server for Linux V6.4
- - APAR LI78899 (package LI78899_gskit8_57_update.tgz) for Linux
- - apply the latest GSKit update package for level 6.4.0.6 on Linux platform
5724I34 Communications Server for Linux on System z V6.4
- - APAR LI78896 (package LI78896_gskit8_57_update.tgz) for Linux on System z
- - apply the latest GSKit update package for level 6.4.0.6 on Linux platform
5639F25 Communications Server for Windows V6.4
- - APAR JR55055 (package JR55055.zip) for Windows 32-bit
- - apply the latest GSKit update package for level 6.4.0.6 on Windows plaform
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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