Security Bulletin: Multiple vulnerabilities in IBM Java SDK affect Rational Developer for i, Rational Developer for AIX and Linux, Rational Developer for Power Systems Software

Security Bulletin

Summary

There are multiple vulnerabilities in IBM® SDK Java™ Technology Edition, Versions 6, 7, and 8 that are used by Rational Developer for i, Rational Developer for AIX and Linux, Rational Developer for Power Systems Software (CVE-2015-7575, CVE-2016-0466, CVE-2016-0475, CVE-2016-0448). These issues were disclosed as part of the IBM Java SDK updates in January 2016 and includes the vulnerability commonly referred to as “SLOTH”.

Vulnerability Details

Rational Developer for i, Rational Developer for AIX and Linux, Rational Developer for Power Systems Software are affected by the following vulnerabilities:

CVEID: CVE-2015-7575
DESCRIPTION: The TLS protocol could allow weaker than expected security caused by a collision attack when using the MD5 hash function for signing a ServerKeyExchange message during a TLS handshake. An attacker could exploit this vulnerability using man-in-the-middle techniques to impersonate a TLS server and obtain credentials. This vulnerability is commonly referred to as “SLOTH”.
CVSS Base Score: 7.1
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/109415 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/UI:U/C:H/I:L/A:N)

CVEID: CVE-2016-0466
DESCRIPTION: An unspecified vulnerability related to the JAXP component could allow a remote attacker to cause a denial of service.
CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/109948 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVEID: CVE-2016-0475
DESCRIPTION: An unspecified vulnerability related to the Libraries component has partial confidentiality impact, partial integrity impact, and no availability impact.
CVSS Base Score: 5.8
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/109946 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:P/A:N)

CVEID: CVE-2016-0448
DESCRIPTION: An unspecified vulnerability related to the JMX component could allow a remote attacker to obtain sensitive information.
CVSS Base Score: 4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/109949 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:S/C:P/I:N/A:N)

Affected Products and Versions

Product Name	Versions Affected
Rational Developer for Power Systems Software	8.0, 8.0.0.1, 8.0.0.2, 8.0.0.3, 8.0.3, 8.0.3.1, 8.5, 8.5.1
Rational Developer for i	9.0, 9.0.0.1, 9.0.1, 9.1, 9.1.1, 9.1.1.1, 9.5, 9.5.0.1, 9.5.0.2
Rational Developer for AIX and Linux, AIX COBOL Edition	9.0, 9.0.0.1, 9.0.1, 9.1, 9.1.1, 9.1.1.2
Rational Developer for AIX and Linux, C/C++ Edition	9.0, 9.0.0.1, 9.0.1, 9.1, 9.1.1, 9.1.1.2

Remediation/Fixes

Product	VRMF	Remediation/First Fix
Rational Developer for Power Systems Software	8.0 through 8.5.1	For all versions, apply IBM SDK Java Technology Edition Critical Patch Update - January 2016 - RD Power
Rational Developer for i	9.0 through to 9.5	For all versions, update the currently installed product using Installation Manager. For instructions on installing this update using Installation Manager, review the topic Updating Installed Product Packages in the IBM Knowledge Center. Or, you can optionally download the update manually and apply IBM SDK Java Technology Edition Critical Patch Update - January 2016- RDi
Rational Developer for AIX and Linux	9.0 through to 9.1	For all client versions, update the currently installed product using Installation Manager. For instructions on installing this update using Installation Manager, review the topic Updating Installed Product Packages in the IBM Knowledge Center. For server updates or to manually download and apply the client updates see IBM SDK Java Technology Edition Critical Patch Update - January 2016 - RDAL

Workarounds and Mitigations

For CVE-2015-7575:

Users of Java 7 and later can address the issue by updating the /jre/lib/security/java.security file as follows (both steps are required):

· Add MD5 to the jdk.certpath.disabledAlgorithms property - e.g. jdk.certpath.disabledAlgorithms=MD2, RSA keySize < 1024, MD5

· Add MD5withRSA to the jdk.tls.disabledAlgorithms property - e.g. jdk.tls.disabledAlgorithms=SSLv3, RC4, DH keySize < 768, MD5withRSA

Java 6 requires code changes in the JSSE component in addition to the java.security file modifications, so upgrading the JDK is the only solution.

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References

Complete CVSS v2 Guide
On-line Calculator v2

Complete CVSS v3 Guide
On-line Calculator v3

Off

Acknowledgement

CVE-2015-7575 was reported to IBM by Karthikeyan Bhargavan at INRIA in Paris, France

Change History

23 February 2016: 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

Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

Internal Use Only

PSIRT 4587: Record RDi: 69652 RDAL:69429
PSIRT 4590: Record RDi: 69227 RDAL:69004

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Tips

Security Bulletin: Multiple vulnerabilities in IBM Java SDK affect Rational Developer for i, Rational Developer for AIX and Linux, Rational Developer for Power Systems Software