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From Robert Klemme <shortcut...@googlemail.com>
Subject Nessus scan claims vulnerability in Tomcat 6
Date Mon, 25 Feb 2013 16:42:13 GMT
Hi there,

I have been confronted with a Nessus scan result which claims
vulnerability to exploit "TLS CRIME". Plugin 62565 allegedly has found
this and the report states:

"The remote service has one of two configurations that are known to be
required for the CRIME attack:
- SSL / TLS compression is enabled.
- TLS advertises the SPDY protocol earlier than version 4.

...

CVE-2012-4929 CVE-2012-4930
"

We have in server.xml:

<Connector SSLCertificateFile="/path" SSLCipherSuite="*******"
protocol="HTTP/1.1" connectionTimeout="20000"
SSLCertificateKeyFile="/path" secure="true" scheme="https"
maxThreads="500" port="4712" maxSavePostSize="0" server="***"
SSLProtocol="TLSv1" maxPostSize="2048" URIEncoding="UTF-8"
SSLEnabled="true" />

(paths and some other info replaced by dummies)

XML attribute "compression" is not present which according to the docs
means "off".
I cannot find indication that SPDY does even exist in Tomcat 6.

I also could not find anything in the list of vulnerabilities at
http://tomcat.apache.org/security-6.html nor could I by searching for
combinations of "tomcat" with the issue numbers given above.

Now, what to make of this?  To me it seems only compression could be
the culprit but is there any other way to enable compression for HTTPS
than to include "compression"?  Or does the TLS negotiation ignore
setting "compression"?  I could not find indication of any option to
control compression in the Javadocs
http://docs.oracle.com/javase/7/docs/api/javax/net/ssl/package-summary.html

Kind regards

robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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