Security Bulletin
Summary
There are multiple vulnerabilities in IBM® Runtime Environment Java™ Technology Edition, Versions 6, 7 and 8 that are used by IBM Rational ClearCase. These issues were disclosed as part of the IBM Java SDK updates in October 2015 and January 2016 and include the vulnerability commonly referred to as "SLOTH".
Vulnerability Details
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-2015-4872
DESCRIPTION: An unspecified vulnerability related to the Security component has no confidentiality impact, partial integrity impact, and no availability impact.
CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/107361 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:P/A:N)
CVEID: CVE-2015-4893
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/107359 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVEID: CVE-2015-4803
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/107358 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)
Affected Products and Versions
IBM Rational ClearCase, versions 7.1.0.x, 7.1.1.x, 7.1.2.x, 8.0.0.x, 8.0.1.x, and 9.0 in the following components:
- CCRC WAN server/CM Server component, when configured to use SSL
- ClearCase remote client: CCRC/CTE GUI, rcleartool, and CMAPI clients, when using SSL to access a CCRC WAN Server/CM Server
ClearCase version | Status |
9.0 | Affected only by CVE-2015-7575 |
8.0.1 through 8.0.1.10 | Affected |
8.0 through 8.0.0.17 | Affected |
7.1.0.x 7.1.1.x 7.1.2.x (all versions and fix packs) | Affected |
Remediation/Fixes
The solution is to install a fix that includes an updated Java™ Virtual Machine with fixes for the issues, and to apply fixes for WebSphere Application Server (WAS).
CCRC Client fixes
- Apply the relevant fixes as listed in the table below.
- If you use CCRC as an extension offering installed into an Eclipse shell (one not provided as part of a ClearCase release), or you use rcleartool or CMAPI using a Java™ Virtual Machine not supplied by IBM as part of Rational ClearCase, you should update the Java™ Virtual Machine you use to include a fix for the above issues. Contact the supplier of your Java™ Virtual Machine and/or the supplier of your Eclipse shell.
Affected Versions | Applying the fix |
9.0 | Install Rational ClearCase Fix Pack 1 (9.0.0.01) for 9.0 |
8.0.1 through 8.0.1.10 | Install Rational ClearCase Fix Pack 11 (8.0.1.11) for 8.0.1 |
8.0 through 8.0.0.17 | Install Rational ClearCase Fix Pack 18 (8.0.0.18) for 8.0 |
7.1.2.x (all fix packs) 7.1.1.x (all fix packs) 7.1.0.x (all fix packs) | Customers on extended support contracts should contact Customer Support. |
Notes:
- Determine the WAS version used by your CCRC WAN server. Navigate to the CCRC profile directory (either the profile you specified when installing ClearCase, or <ccase-home>/common/ccrcprofile), then execute the script: bin/versionInfo.sh (UNIX) or bin\versionInfo.bat (Windows). The output includes a section "IBM WebSphere Application Server". Make note of the version listed in this section.
- Review the following WAS security bulletin:
Security Bulletin: Multiple vulnerabilities in IBM® Java SDK affect WebSphere Application Server January 2016 CPU
and apply the latest available fix for the version of WAS used for CCRC WAN server.
Note: there may be newer security fixes for WebSphere Application Server. Follow the link below (in the section "Get Notified about Future Security Bulletins") to subscribe to WebSphere product support alerts for additional Java SDK fixes.
Affected Versions | Applying the fix |
| 8.0.0.x 8.0.1.x 9.0 | Apply the appropriate WebSphere Application Server fix directly to your CCRC WAN server host. No ClearCase-specific steps are necessary. |
| 7.1.2.x (all fix packs) 7.1.1.x (all fix packs) 7.1.0.x (all fix packs) | Customers on extended support contracts should contact customer support. |
Workarounds and Mitigations
For CVE-2015-7575, the following workaround is available for ClearCase 9.0, which uses Java 7 or Java 8 (depending on platform).
If you are unable to apply the fix pack, you may use this temporary change on every CTE/CMAPI/rcleartool client.
The administrator can address the issue on clients by updating the file /opt/rational/common/java/jre/lib/security/java.security (UNIX) or RationalSDLC\common\JAVA\jre\lib\security\java.security (Windows) 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 (used by ClearCase 8.0 and 8.0.1) requires code changes in the JSSE component in addition to the java.security file modifications, so upgrading the JDK is the only solution.
Get Notified about Future Security Bulletins
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
Change History
* 17 March 2016: Originally published
* 26 April 2016: Updated with test fix for ClearCase 9.0
* 27 May 2016: Updated to refer to fix packs
*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
For 7.1.x customers with extended support contacts that include security coverage, contact L3 for support to negotiate a plan to deliver a fixed JRE to the customer.
| test fixes: 8.0.1.10.0008 8.0.0.17.0001 9.0.0001 |
In 2016A fix packs, the JRE updates will be included and the test fix details here will be replaced with updated fix pack details.
The WAS fixes also include (and supersede) the October 2015 Java CPU fixes.
Those are listed in this bulletin:
Security Bulletin: Multiple vulnerabilities in IBM® Java SDK affect WebSphere Application Server October 2015 CPU
For 7.1.x customers, the October 2015 CPU for WAS is the last available fix (no more WAS fixes for 6.1 series after that)
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Document Information
Modified date:
10 July 2018
UID
swg21976573