openssl security update (RHSA-2015-1072)

Original Release Date: July 9, 2015
Last Revised: July 25, 2016
Number: ASA-2015-248
Risk Level: Low
Advisory Version: 6.0
Advisory Status: Final

1. Overview:

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols, as well as a full-strength, general purpose cryptography library.

A flaw was found in the way the TLS protocol composes the Diffie-Hellman (DH) key exchange. A man-in-the-middle attacker could use this flaw to force the use of weak 512 bit export-grade keys during the key exchange, allowing them to decrypt all traffic. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2015-4000 to this issue.

Note: This update forces the TLS/SSL client implementation in OpenSSL to reject DH key sizes below 768 bits, which prevents sessions to be downgraded to export-grade keys. Future updates may raise this limit to 1024 bits.

More information about these vulnerabilities can be found in the security advisory issued by Red Hat:

2. Avaya System Products using a modified version of RHEL6 with affected packages installed:

Product: Affected Version(s): Risk Level: Actions:
Avaya CMS R17 thru R17 R4 Low Upgrade to R17 R5 or R18, or later.
Avaya Breeze™ Platform 2.x, 3.0 Low Upgrade to 3.1 or later.
Avaya Aura® Communication Manager 7.0 Low Install 7.0 Security Service Pack 1 or later.
Avaya Aura® Conferencing 7.x, 8.0 thru 8.0 SP4 Low Upgrade to 8.0 SP5 or later.
Avaya Aura® Experience Portal 6.x, 7.0, 7.0.1 Low For 6.0, upgrade to 7.0.2 and Avaya Linux for 7.0.2 and install Linux Patch 2015-10 or later.
For 7.0.x install Linux Patch 2015-10 or later.
Avaya IP Office Server Edition 9.0 thru 9.1.5 Low Upgrade to 9.1.6 or later
Avaya IP Office Application Server 9.0 thru 9.1.5 Low Upgrade to 9.1.6 or later.
Avaya one-X® Client Enablement Services 6.2 thru 6.2 SP3 Low Upgrade to 6.2 SP4 or later.
Avaya Session Border Controller for Enterprise 6.3.x Low Upgrade to 7.0 or later.
Avaya Aura® Session Manager 6.3 thru 6.3.14, 7.0 Low For 6.3 upgrade to 6.3.15 or later.
For 7.0 upgrade to 7.0.0.1 or later.

Recommended Actions for System Products:
Avaya strongly recommends following networking and security best practices by implementing firewalls, ACLs, physical security or other appropriate access restrictions. Though Avaya believes such restrictions should always be in place, risk to Avaya products and the surrounding network from this potential vulnerability may be mitigated by ensuring these practices are implemented until such time as an Avaya provided product update or the recommended Avaya action is applied. Further restrictions as deemed necessary based on the customer's security policies may be required during this interim period, but the System Product operating system or application should not be modified unless the change is approved by Avaya. Making changes that are not approved may void the Avaya product service contract.

Mitigating Factors:

When determining risk, Avaya takes into account many factors as outlined by Avaya's Security Vulnerability Classification Policy. The following table describes factors that mitigate the risk of specific vulnerabilities for affected Avaya products:

Vulnerability Mitigating Factors
CVE-2015-4000
This is a Low risk as the use of export ciphers are disabled by default.

3. Avaya Software-Only Products:

Avaya software-only products operate on general-purpose operating systems. Occasionally vulnerabilities may be discovered in the underlying operating system or applications that come with the operating system. These vulnerabilities often do not impact the software-only product directly but may threaten the integrity of the underlying platform.

In the case of this advisory Avaya software-only products are not affected by the vulnerability directly but the underlying Linux platform may be. Customers should determine on which Linux operating system the product was installed and then follow that vendor's guidance.

Product: Actions:
Avaya Aura® Experience Portal Depending on the Operating System installed, the affected package may be installed on the underlying Operating System supporting the EP application.

Recommended Actions for Software-Only Products:
In the event that the affected package is installed, Avaya recommends following recommended actions supplied by Red Hat regarding their Enterprise Linux.

4. Additional Information:

Additional information may also be available via the Avaya support website and through your Avaya account representative. Please contact your Avaya product support representative, or dial 1-800-242-2121, with any questions.

5. Disclaimer:

ALL INFORMATION IS BELIEVED TO BE CORRECT AT THE TIME OF PUBLICATION, IS PROVIDED "AS IS", AND IS APPLICABLE ONLY TO PRODUCT VERSIONS ELIGIBLE FOR MANUFACTURER SUPPORT IN ACCORDANCE WITH AVAYA PRODUCT LIFE CYCLE POLICY. AVAYA INC., ON BEHALF ITSELF AND ITS SUBSIDIARIES AND AFFILIATES (HEREINAFTER COLLECTIVELY REFERRED TO AS "AVAYA"), DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND FURTHERMORE, AVAYA MAKES NO REPRESENTATIONS OR WARRANTIES THAT THE STEPS RECOMMENDED WILL ELIMINATE SECURITY OR VIRUS THREATS TO CUSTOMERS' SYSTEMS. IN NO EVENT SHALL AVAYA BE LIABLE FOR ANY DAMAGES WHATSOEVER ARISING OUT OF OR IN CONNECTION WITH THE INFORMATION OR RECOMMENDED ACTIONS PROVIDED HEREIN, INCLUDING DIRECT, INDIRECT, INCIDENTAL, STATUTORY, CONSEQUENTIAL DAMAGES, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF AVAYA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

THE INFORMATION PROVIDED HERE DOES NOT AFFECT THE SUPPORT AGREEMENTS IN PLACE FOR AVAYA PRODUCTS. SUPPORT FOR AVAYA PRODUCTS CONTINUES TO BE EXECUTED AS PER EXISTING AGREEMENTS WITH AVAYA.

6. Revision History:

V 1.0 - July 9, 2015 - Initial Statement issued.
V 2.0 - October 20, 2015 - Updated CMS, CE, EP, one-X CES, ASBC and SM affected versions and actions.
V 3.0 - November 19, 2015 - Updated CMS affected versions and actions.
V 4.0 - February 2, 2016 - Updated SM affected versions and actions.
V 5.0 - February 9, 2016 - Updated Conferencing affected versions and actions.
V 6.0 - July 25, 2016 - Updated CM, IPO and IPOAS affected versions and actions and set Advisory status to Final.

Avaya customers or Business Partners should report any security issues found with Avaya products via the standard support process.
Independent security researchers can contact Avaya at securityalerts@avaya.com.

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