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From Mark Thomas <ma...@apache.org>
Subject [SECURITY] CVE-2009-3555 SSL Man-In-The-Middle attack
Date Mon, 09 Nov 2009 16:43:39 GMT
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A vulnerability in the TLS protocol has recently been made public [1]
that allows an attacker to inject arbitrary requests into an TLS stream.

The current understanding of the Tomcat developers is as follows:

BIO & NIO connectors using JSSE
These connectors are vulnerable when renegotiation is triggered by the
client or the server.
Server initiated re-negotiation can be limited by configuration
Server initiated re-negotiation could be prevented by a code change
Client initiated re-negotiation can not currently be prevented

APR/Native connector using OpenSSL
Vulnerable when renegotiation is triggered by the client or the server.
Server initiated re-negotiation is not supported prior to 1.1.17
Client initiated re-negotiation is supported but can not be prevented

OpenSSL 0.9.8l disables all negotiation by default


In terms of what this means for users:

BIO/NIO
- - We haven't yet (we are still looking) found a way to stop client
  initiated renegotiation. It may be necessary to wait for the JVM
  vendors to respond.

APR/native
- - Re-building any version of the APR/native connector with OpenSSL
  0.9.8l will protect against this vulnerability but any configurations
  that require renegotiation will break.
- - Version 1.1.17 of the APR/native connector will be released shortly.
  The binary versions will be built with OpenSSL 0.9.8l which will
  protect against this vulnerability but configurations that require
  renegotiation will break.

Supporting renegotiation whilst avoiding the vulnerability requires a
protocol fix. The Tomcat development team is examining possible
work-arounds that may provide an interim solution. These options include
porting r833582 from httpd to the APR/native connector which would
disable client triggered renegotiation for OpenSSL < 0.9.8l which may
help some users who can't easily change their OpenSSL version.

If you'd would like to join/follow the work-around discussions, please
join the Tomcat dev mailing list. Any significant developments in this
area will be posted to the Tomcat announce@ and users@ mailing lists.

Mark

[1] http://extendedsubset.com/?p=8
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