|Date:||15 июля 2013 г.|
|Subject:||ESA-2013-045: RSA BSAFE® SSL-C Security Update for SSL/TLS Plaintext Recovery (aka “Lucky Thirteen”) Vulnerability|
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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 .
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