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ESA-2013-045: RSA BSAFE® SSL-C Security Update for SSL/TLS Plaintext Recovery (aka “Lucky Thirteen”) Vulnerability
EMC Identifier: ESA-2013-045
CVE Identifier: CVE-2013-0169
Severity Rating: CVSS v2 Base Score: 2.6 (AV:N/AC:H/Au:N/C:P/I:N/A:N)
All versions of RSA BSAFE SSL-C except for 2.8.7
RSA BSAFE SSL-C 2.8.7 (newly released)
RSA BSAFE SSL-C 2.8.7 contains updates designed to prevent SSL/TLS Plaintext Recovery (aka Lucky Thirteen) attacks (CVE-2013-0169).
Researchers have discovered a weakness in the handling of CBC cipher suites in SSL, TLS and DTLS. The “Lucky Thirteen” attack exploits timing differences arising during MAC processing. Vulnerable implementations do not properly consider timing side-channel attacks on a MAC check requirement during the processing of malformed CBC padding, which allows remote attackers to conduct distinguishing attacks and plaintext-recovery attacks via statistical analysis of timing data for crafted packets, aka the "Lucky Thirteen" issue.
Details of this attack can be found at: http://www.isg.rhul.ac.uk/tls/TLStiming.pdf
RSA BSAFE SSL-C 2.8.7 contains a patch that is designed to help ensure that MAC checking is time invariant in servers.
RSA recommends that customers on RSA BSAFE SSL-C 2.8.6 or lower upgrade to RSA BSAFE SSL-C 2.8.7.
Customers can also protect against the attack by disabling CBC mode cipher suites on clients and servers. Cipher suites that use RC4 and, if TLS 1.2 is available, AES-GCM can be used.
To request your upgrade of the software, please call your local support telephone number (contact phone numbers are available at http://www.rsa.com/node.aspx?id=1356 ) for most expedient service. You may also request your software upgrade online at http://www.rsa.com/go/form_ins.asp .
To obtain RSA documentation, log on to RSA SecurCare Online at https://knowledge.rsasecurity.com and click Products in the top navigation menu. Select the specific product whose documentation you want to obtain. Scroll to the section for the product version that you want and click the set link.
For an explanation of Severity Ratings, refer to the Knowledge Base Article, “Security Advisories Severity Rating” at https://knowledge.rsasecurity.com/scolcms/knowledge.aspx?solution=a46604. RSA recommends all customers take into account both the base score and any relevant temporal and environmental scores which may impact the potential severity associated with particular security vulnerability.
Obtaining More Information:
For more information about RSA products, visit the RSA web site at http://www.rsa.com.
Getting Support and Service:
For customers with current maintenance contracts, contact your local RSA Customer Support center with any additional questions regarding this RSA SecurCare Note. For contact telephone numbers or e-mail addresses, log on to RSA SecurCare Online at https://knowledge.rsasecurity.com, click Help & Contact, and then click the Contact Us - Phone tab or the Contact Us - Email tab.
General Customer Support Information:
RSA SecurCare Online:
RSA has a defined End of Primary Support policy associated with all major versions. Please refer to the link below for additional details. http://www.rsa.com/node.aspx?id=2575
SecurCare Online Security Advisories
RSA, The Security Division of EMC, distributes SCOL Security Advisories in order to bring to the attention of users of the affected RSA products important security information. RSA recommends that all users determine the applicability of this information to their individual situations and take appropriate action. The information set forth herein is provided "as is" without warranty of any kind. RSA disclaim all warranties, either express or implied, including the warranties of merchantability, fitness for a particular purpose, title and non-infringement. In no event shall RSA or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if RSA or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
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