Hi,
In my site I’m using a certificate from www.securitymetrics.com. Today they disabled my certificate. This is supposed to be the main reason: Description: SSL/TLS Protocol Initialization Vector Implementation Information Disclosure Vulnerability Synoposis: It may be possible to obtain sensitive information from the remote host with SSL/TLS-enabled services. Impact: A vulnerability exists in SSL 3.0 and TLS 1.0 that could allow information disclosure if an attacker intercepts encrypted traffic served from an affected system. TLS 1.1, TLS 1.2, and all cipher suites that do not use CBC mode are not affected. This script tries to establish an SSL/TLS remote connection using an affected SSL version and cipher suite, and then solicits return data. If returned application data is not fragmented with an empty or one-byte record, it is likely vulnerable. OpenSSL uses empty fragments as a countermeasure unless the 'SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS' option is specified when OpenSSL is initialized. Microsoft implemented one-byte fragments as a countermeasure, and the setting can be controlled via the registry key H KEY_LOCAL_MACHINE\\System\\CurrentControlSet\\Control\\SecurityProviders \\SCHANNEL\\SendExtraRecord <file://schannel/SendExtraRecord>. Therefore, if multiple applications use the same SSL/TLS implementation, some may be vulnerable while others may not, depending on whether or not a countermeasure has been enabled. Note that this script detects the vulnerability in the SSLv3/TLSv1 protocol implemented in the server. It does not detect the BEAST attack where it exploits the vulnerability at HTTPS client-side (i.e., Internet browser). The detection at server-side does not necessarily mean your server is vulnerable to the BEAST attack because the attack exploits the vulnerability at client-side, and both SSL/TLS clients and servers can independently employ the split record countermeasure. See also : http://www.openssl.org/~bodo/tls-cbc.txt http://vnhacker.blogspot.com/2011/09/beast.html http://technet.microsoft.com/en-us/security/bulletin/ms12-006 http://support.microsoft.com/kb/2643584 http://blogs.msdn.com/b/kaushal/archive/2012/01/21/fixing-the-beast.aspxData Received: Negotiated cipher suite: EDH-RSA-DES- CBC3-SHA|SSLv3|Kx=DH|Au=RSA|Enc=3DES(168)|Mac=SHA1 Resolution: Configure SSL/TLS servers to only use TLS 1.1 or TLS 1.2 if supported. Configure SSL/TLS servers to only support cipher suites that do not use block ciphers. Apply patches if available. Note that additional configuration may be required after the installation of the MS12-006 security update in order to enable the split-record countermeasure. See http://support.microsoft.com/kb/2643584 for details. Risk Factor: Medium/ CVSS2 Base Score: 4.3 (AV:N/AC:M/Au:N/C:P/I:N/A:N) CVE: CVE-2011-3389 This is supposed to explain it further: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2011-3389 What should I do? Should I modify the parameters in my Tomcat Connector? Should I upgrade my JVM? Should I upgrade Tomcat to a most recent version? Should I use Windows instead of Linux? (I’m joking with the last one!) Some information you may need to answer this: - Linux Centos 5.8 - I’m using an SSL certificate from geotrust, a very current one (as far as I know). - JVM: 1.6.0_11-b03 - Tomcat 7.0.10 (Even though I disguised it as 7.0.25, actually so securitymetrics don’t bother me with some very obscure vulnerabilities that would force me to update it otherwise) - This is the relevant entry in my server.xml file: <Connector connectionTimeout="10000" enableLookups="true" port="8443" scheme="https" secure="true" clientAuth="false" keystoreFile="conf/certificate.kdb" minSpareThreads="4" maxThreads="1000" sslProtocol="SSLv3" ciphers="SSL_RSA_WITH_RC4_128_MD5,SSL_RSA_WITH_RC4_128_SHA,SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA" protocol="HTTP/1.1" SSLEnabled="true"> </Connector> Thanks in advance! Brian
