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AUSCERT External Security Bulletin Redistribution
ESB-2015.0589
Security Bulletin: Vulnerability in GSKit affects Tivoli Access Manager for
e-business and Security Access Manager for Web (CVE-2015-0138)
12 March 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM Security Access Manager for Web
IBM Tivoli Access Manager for e-business
Publisher: IBM
Operating System: Network Appliance
AIX
Linux variants
Solaris
Windows
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2015-0138
Reference: ESB-2015.0542
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21698891
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Security Bulletin: Vulnerability in GSKit affects Tivoli Access Manager for
e-business and Security Access Manager for Web (CVE-2015-0138)
Document information
More support for:
IBM Security Access Manager for Web
Software version:
6.0, 6.1, 6.1.1, 7.0, 8.0, 8.0.0.2, 8.0.0.4, 8.0.0.5, 8.0.1
Operating system(s):
All Platforms
Reference #:
1698891
Modified date:
2015-03-11
Security Bulletin
Summary
GSKit is an IBM component that is used by IBM Tivoli Access Manager for
e-business and IBM Security Access Manager for Web. The GSKit that is shipped
with IBM Tivoli Access Manager for e-business and IBM Security Access Manager
for Web contains multiple security vulnerabilities including the FREAK:
Factoring Attack on RSA-EXPORT keys" TLS/SSL client and server vulnerability.
IBM Tivoli Access Manager for e-business and IBM Security Access Manager for
Web has addressed the applicable CVEs.
Vulnerability Details
CVEID: CVE-2015-0138
DESCRIPTION: A vulnerability in various IBM SSL/TLS implementations could
allow a remote attacker to downgrade the security of certain SSL/TLS
connections. An IBM SSL/TLS client implementation could accept the use of an
RSA temporary key in a non-export RSA key exchange ciphersuite. This could
allow a remote attacker using man-in-the-middle techniques to facilitate
brute-force decryption of TLS/SSL traffic between vulnerable clients and
servers.
This vulnerability is also known as the FREAK attack.
CVSS Base Score: 4.3
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/#/vulnerabilities/100691 for the current
score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Affected Products and Versions
IBM Tivoli Access Manager for e-business versions 6.0, 6.1, 6.1.1
IBM Security Access Manager for Web version 7.0 software
IBM Security Access Manager for Web version 7.0 appliance, all firmware
versions
IBM Security Access Manager for Web version 8.0 appliance, all firmware
versions
Remediation/Fixes
None
Workarounds and Mitigations
The following steps describe how to mitigate this vulnerability for the
affected releases.
1) Apply security patch
Security patches have been provided for all versions of IBM Tivoli Access
Manager for e-business (TAMeb) and IBM Security Manager for Web (ISAM for
Web). The mitigations for the GSKit FREAK vulnerability require that these
patches be installed first. Please read the security bulletins provided in the
table below for your product version for instructions on obtaining and
applying the necessary security patches.
Important these patches must be applied before moving onto step two Applying
mitigation following.
Product Link to security bulletin
IBM Tivoli Access Manager for e-business Security Bulletin: Vulnerability in
SSLv3 affects IBM Tivoli Access Manager
for e-business (CVE-2014-3566)
IBM Security Access Manager for Web Security Bulletin: Vulnerability in SSLv3
affects IBM Security Access Manager (CVE-2014-3566)
2) Apply mitigation
Mitigation for all TAMeb versions and ISAM for Web 7.0 software version
1). Download the latest version of GSKit, 7.0.5.5 or 8.0.50.41, for your
currently installed TAMeb or ISAM version -
IBM Security Access Manager for Web 7.0.0
Tivoli Access Manager for e-business 6.1.1
Tivoli Access Manager for e-business 6.1.0
Tivoli Access Manager for e-business 6.0.0
2). Shutdown all running instances of WebSEAL on the machine for which these
instructions are to be followed.
3). For all ISAM and TAMeb versions. For all machines hosting WebSEAL if the
following environment variables have been set
GSK_V2_CIPHER_SPECS
GSK_V3_CIPHER_SPECS
remove all references of the following cipher numbers
03 06 62 64
4). For ISAM 7.0 only. For each instance of WebSEAL, under the [ssl] stanza
remove all references to the following RSA_EXPORT ciphers from both the
gsk_attr_name and the jct_gsk_attr_name attributes -
Long Name
- -----------------------------------
TLS_RSA_EXPORT_WITH_RC4_40_MD5
TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5
TLS_RSA_EXPORT1024_WITH_RC4_56_SHA
TLS_RSA_EXPORT1024_WITH_DES_CBC_SHA
Note - any instance of the long names for the above ciphers should be removed.
5). For all TAMeb and ISAM versions. For all instances of WebSEAL, if the
GSKit environment variables have been correctly configured as outlined in step
two above and the value of the ssl-qop-mgmt within the WebSEAL configuration
file is currently set to No or False then no additional actions are required.,
Skip to step six following.
For all instances of WebSEAL, if the ssl-qop-mgmt attribute is set to Yes or
True and the default attribute is set to ALL then redefine the default
attribute values to include a subset of ciphers ensuring that the following
are not present -
default = RC4-40
default = RC2-40
default = DES-56
default = DES-56-62
default = RC4-56
Finally, for all instances of WebSEAL with alternative ssl-qop-mgmt
configurations ensure that all references to the following ciphers are removed
- -
default = RC4-40
default = RC2-40
default = DES-56
default = DES-56-62
default = RC4-56
6). For all instances of WebSEAL, if not already done, set the following
environment variable during WebSEALs start up process -
GSK_STRICTCHECK_CBCPADBYTES = GSK_FALSE
Important - If this environment variable is already set then it can remain in
place. It should not have any effect on this mitigation plan.
7). Upgrade to GSKit, 7.0.5.5 or 8.0.50.41, using the instructions provided in
the readme of their respective releases.
8). Restart all instances of WebSEAL.
Mitigation for all ISAM for Web 7.0 and 8.0 appliance versions
1). Download the GSKit 8.0.50.41 appliance fix packs for the product version -
IBM Security Access Manager for Web 8.0.1.0 IF0002
IBM Security Access Manager for Mobile 8.0.1.0 IF0002
IBM Security Access Manager for Web (WGA) 7.0.0 IF0011
IBM Single Sign On for Bluemix v2 Identity Bridge 8.0.1.0 IF0002
2). Shut down all instances of the Reverse Proxy hosted by the appliance where
these instructions are to be followed.
3). For each of the instance of Reverse Proxy open its configuration file
using the following instructions -
1. Select 'Secure Web Settings -> Reverse Proxy' from the menu bar;
2. Select the Reverse Proxy instance;
3. Select 'Manage -> Configuration -> Edit Configuration File' from the menu
4). For each instance of Reverse Proxy, under the [ssl] stanza remove all
references to the following RSA_EXPORT ciphers from both the gsk_attr_name and
the jct_gsk_attr_name attributes -
Long Name
- -----------------------------------
TLS_RSA_EXPORT_WITH_RC4_40_MD5
TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5
TLS_RSA_EXPORT1024_WITH_RC4_56_SHA
TLS_RSA_EXPORT1024_WITH_DES_CBC_SHA
Note - any instance of the long names for the above ciphers should be removed.
5). For all instances of the Reverse Proxy, if the ssl-qop-mgmt attribute is
set to Yes or True and the default attribute is set to ALL then redefine the
default attribute values to include a subset of ciphers ensuring that the
following are not present -
default = RC4-40 default = RC2-40
default = DES-56
default = DES-56-62
default = RC4-56
Finally, for all instances of the Reverse Proxy with alternative ssl-qop-mgmt
configurations ensure that all references to the following ciphers are removed
- -
default = RC4-40
default = RC2-40
default = DES-56
default = DES-56-62
default = RC4-56
6). For each instance of Reverse Proxy if not already set, set the following
attribute and value under the [ssl] stanza -
gsk-attr-name = enum:471:0
jct-gsk-attr-name = enum:471:0
Note - If this attribute is already set to then this can remain in place. It
should not have any affect for the mitigation plan.
7). For each instance of Reverse Proxy save and deploy the changes.
8). Upgrade GSKit 8.0.50.41 by applying the appliance fix pack using the
following instructions -
1). Click Manage, and then click Fix Packs.
2). In the Fix Packs pane, click New.
3). In the Add Fix Pack window, click Browse to locate the fix pack file, and
then click Open.
4). Click Submit to install the fix pack.
9). Once the appliance has restarted, verify that all Reverse Proxy servers
are restarted successfully.
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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
*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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