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AUSCERT External Security Bulletin Redistribution
ESB-2015.0784
Security Bulletin: Vulnerabilities in GSKit affect Security Access Manager
for DataPower (CVE-2015-0159, CVE-2015-0138)
30 March 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM DataPower Gateway
Publisher: IBM
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-0159 CVE-2015-0138 CVE-2014-8730
Reference: ESB-2015.0683
ESB-2015.0646
ESB-2014.2484
ESB-2014.2466
ESB-2014.2520.2
ESB-2014.2375.2
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21700204
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Security Bulletin: Vulnerabilities in GSKit affect Security Access Manager
for DataPower (CVE-2015-0159, CVE-2015-0138)
Security Bulletin
Document information
More support for:
IBM DataPower Gateways
General
Software version:
5.0.0, 6.0.0, 6.0.1, 7.0.0, 7.1
Operating system(s):
Firmware
Software edition:
Edition Independent
Reference #:
1700204
Modified date:
2015-03-26
Summary
GSKit is an IBM component that is used by Security Access Manager components
on DataPower. The GSKit that is shipped with Security Access Manager contains
several security vulnerabilities including the “FREAK: Factoring Attack on
RSA-EXPORT keys" TLS/SSL client and server vulnerability. The Security Access
Manager components on DataPower have addressed the applicable CVEs.
Both the Access Manager Reverse Proxy introduced in DataPower version 7.1 and
the Access Manager Client are affected.
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
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:P/A:N)
CVEID: CVE-2015-0159
DESCRIPTION: An unspecified error in GSKit usage of OpenSSL crypto function
related to the production of incorrect results on some platforms by Bignum
squaring (BN_sqr) has an unknown attack vector and impact in some ECC
operations.
CVSS Base Score: 2.6
CVSS Temporal Score: See http://exchange.xforce.ibmcloud.com/#/vulnerabilities/100835
CVSS Environmental Score*: UndefinedCVSS Vector: (AV:N/AC:H/Au:N/C:N/I:P/A:N)
Affected Products and Versions
IBM DataPower Gateway appliances all versions through 6.0.0.12, 6.0.1.8,
7.0.0.5, 7.1.0.3
Remediation/Fixes
Fix is available in versions 6.0.0.13, 6.0.1.9, 7.0.0.6, 7.1.0.4. Refer to
APAR IT07604.
You should verify applying this fix does not cause any compatibility issues.
The remediation for CVE-2015-0138 also remediates CVE-2014-8730 "TLS Padding
Vulnerability" (also known as "POODLE 2"). Communication errors can occur if
both ends of the TLS connection do not observe the same strict CBC padding
requirements required to remediate POODLE 2. See the Workarounds and
Mitigations section below for more detail.
For DataPower customers using versions 5.x and older versions, IBM recommends
upgrading to a fixed, supported version/release/platform of the product.
Workarounds and Mitigations
The remediation for CVE-2014-8730 enforces strict CBC padding checks by the
client. If the server does not implement strict CBC padding checks, the
client will reject the TLS data packet and report an error.
IBM STRONGLY recommends that all servers in the Access Manager environment be
upgraded to a version of GSKit (or third-party SSL stack) that remediates the
TLS Padding Vulnerability (CVE-2014-8730). If clients and servers are
mis-matched with respect to this remediation, intermittent communication
errors can occur when the client expects strict padding and the server does
not implement it.
If Access Manager server upgrades are not immediately possible, Access
Manager can be forced to not perform strict padding checks.
Access Manager Client
For each Access Manager Client perform the following:
1) Select Objects > Access Settings > Access Manager Client
2) Select the Access Manager Client
3) Edit the Access Manager client configuration file
4) Add the following string to the [ssl] stanza:
ssl-disable-strict-cbc-padding-check = yes
5) Click Apply to deploy the changes and restart the client.
Access Manager Reverse Proxy
For each Access Manager Reverse Proxy instance perform the following:
1) Select Objects > Security Access Manager > Access Manager Reverse Proxy
from the WebGUI navigation panel.
2) Select the Reverse Proxy instance.
3) Select the Manage Files tab and then the Edit button for the Configuration
File property.
In the [ssl] stanza, add the bold lines below:
gsk-attr-name = enum:471:0
jct-gsk-attr-name = enum:471:0
2) Click Apply to deploy the changes and restart the instance.
NOTE: These settings should be removed when all servers in the Access Manager
environment have been upgraded to remediate CVE-2014-8730.
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alerts like this.
References
Complete CVSS Guide
On-line Calculator V2
Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Access Manager FREAK security bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21698891
Access Manager POODLE 2 security bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21692802
Access Manager for DataPower POODLE 2 security bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21692934
*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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