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AUSCERT External Security Bulletin Redistribution
ESB-2015.0956
Security Bulletin: Vulnerability in RC4 stream cipher
affects IBM DB2 LUW (CVE-2015-2808)
14 April 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM DB2 LUW
Publisher: IBM
Operating System: AIX
HP-UX
Linux variants
Solaris
Windows
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2015-2808
Reference: ESB-2015.0955
ESB-2015.0954
ESB-2015.0953
ESB-2015.0950.2
ESB-2015.0949.2
ESB-2015.0948.2
ESB-2015.0947.2
ESB-2015.0946.2
ESB-2015.0944.2
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21717865
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Security Bulletin: Vulnerability in RC4 stream cipher affects IBM DB2 LUW
(CVE-2015-2808)
Security Bulletin
Document information
More support for:
DB2 for Linux, UNIX and Windows
Software version:
9.5, 9.7, 9.8, 10.1, 10.5
Operating system(s):
AIX, HP-UX, Linux, Solaris, Windows
Software edition:
Advanced Enterprise Server, Advanced Workgroup Server, Enterprise Server,
Express, Express-C, Personal, Workgroup Server
Reference #:
1717865
Modified date:
2015-04-10
Summary
The RC4 Bar Mitzvah Attack for SSL/TLS affects IBM DB2 LUW.
Vulnerability Details
CVEID: CVE-2015-2808
DESCRIPTION: The RC4 algorithm, as used in the TLS protocol and SSL protocol,
could allow a remote attacker to obtain sensitive information. An attacker
could exploit this vulnerability to remotely expose account credentials
without requiring an active man-in-the-middle session. Successful exploitation
could allow an attacker to retrieve credit card data or other sensitive
information. This vulnerability is commonly referred to as "Bar Mitzvah
Attack".
CVSS Base Score: 5
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/101851 for the current
score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:N/A:N)
Affected Products and Versions
Customers who have Secure Sockets Layer (SSL) support enabled in their client
configuration using LDAP security plug-in to communicate with LDAP server are
affected. SSL support is not enabled in LDAP security plug-in by default.
All fix pack levels of IBM DB2 V9.5, V9.7, V10.1 and V10.5 editions listed
below and running on AIX, Linux, HP, Solaris or Windows are affected.
IBM DB2 Express Edition
IBM DB2 Workgroup Server Edition
IBM DB2 Enterprise Server Edition
IBM DB2 Advanced Enterprise Server Edition
IBM DB2 Advanced Workgroup Server Edition
IBM DB2 Connect Application Server Edition
IBM DB2 Connect Enterprise Edition
IBM DB2 Connect Unlimited Edition for System i
IBM DB2 Connect Unlimited Edition for System z
IBM DB2 pureScale Feature for Enterprise Server Edition, V9.8, running on AIX
or Linux is affected.
The IBM data server client and driver types are as follows:
IBM Data Server Driver Package
IBM Data Server Driver for ODBC and CLI
IBM Data Server Runtime Client
IBM Data Server Client
Remediation/Fixes
None
Workarounds and Mitigations
For V9.5 and V9.8 customers, this problem can be mitigated by setting the
environment variable LDAP_OPT_SSL_FIPS_PROCCESSING_MODE.
Mitigation instructions:
Customers should set the environment variable
LDAP_OPT_SSL_FIPS_PROCCESSING_MODE on each DB2 server instance as follows:
On Linux/UNIX:
1) As the DB2 instance owner, add the following line to the userprofile file
that is located under the sqllib directory:
export LDAP_OPT_SSL_FIPS_PROCCESSING_MODE=ON
2) As a user with DB2 SYSADM privilege, run the following commands:
db2set DB2ENVLIST=LDAP_OPT_SSL_FIPS_PROCCESSING_MODE
db2stop
db2start
The commands above assume that DB2ENVLIST registry variable is not set. If it
is set, the environment variable names need to be delimited with a space. For
example, if DB2ENVLIST is already set to SOME_ENV, it needs to be set as
follows:
db2set DB2ENVLIST="SOME_ENV LDAP_OPT_SSL_FIPS_PROCCESSING_MODE"
On Windows:
Set the LDAP_OPT_SSL_FIPS_PROCCESSING_MODE environment variable at system
level. You will need to restart the DB2 server for the environment variables
to be picked up by DB2.
Variable name: LDAP_OPT_SSL_FIPS_PROCCESSING_MODE
Variable value: ON
For V9.7, V10.1 and V10.5 customers, this problem can be mitigated by enabling
FIPS mode in the LDAP security plug-in.
Customers with the fix pack level of V9.7 FP9, V10.1 FP4, V10.5 GA or higher
should follow the instruction below to mitigate the problem.
Customers with fix pack level of V9.7 FP8 or lower, V10.1 FP3 or lower should
upgrade to the latest fix pack. Then follow the instruction below to mitigate
the problem.
Mitigation instructions:
Customers should enable FIPS mode in LDAP security plugin-in as follows:
1. As the DB2 instance owner, open up the LDAP security plugin-in
configuration file
The default name and location for the IBM LDAP security plug-in configuration
file is:
On UNIX: INSTHOME/sqllib/cfg/IBMLDAPSecurity.ini
On Windows: %DB2PATH%\cfg\IBMLDAPSecurity.ini
Optionally, it could be resided in the location defined by the
DB2LDAPSecurityConfig environment variable
2. Search for the FIPS_MODE configuration parameter in the file and change its
value to true. Save and close the file.
; FIPS_MODE
; To set SSL encryption FIPS mode on or off.
; Optional; Valid values are true (on) and false (off). Defaults to
; false (FIPS mode off).
FIPS_MODE = true
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References
Complete CVSS Guide
On-line Calculator V2
Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Acknowledgement
None
Change History
April 10, 2015: Original Version 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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