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CVE-2009-3555 - apache/mod_ssl vulnerability and mitigation
 

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dirkx at apache

Nov 6, 2009, 5:32 PM


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CVE-2009-3555 - apache/mod_ssl vulnerability and mitigation

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Subject: CVE-2009-3555 - apache/mod_ssl vulnerability and mitigation

Apache httpd is affected by CVE-2009-3555[1] (The SSL Injection
or MiM attack[2]).

The Apache httpd webserver relies on OpenSSL for the implementation of
the SSL/TLS protocol.

We strongly urge you to upgrade to OpenSSL 0.9.8l; and to be prepared
to deploy OpenSSL 0.9.8m as it becomes available[3].

Note that these are for short term and mid-term mitigation only; the
long term solution may well require a modification of the SSL and/or
TLS protocols[4].

For those who are not able to upgrade OpenSSL swiftly and/or for
those who need detailed logging - we recommend that you roll out
this patch[5]:

http://www.apache.org/dist/httpd/patches/
apply_to_2.2.14 CVE-2009-3555-2.2.patch
sha1: 28cd58f3758f1add39417333825b9d854f4f5f43

as soon as possible. This is a partial fix in lieu of the protocol
issues being addressed and further changes to OpenSSL. Like the
OpenSSL 0.9.8l stopgap measure this patch rejects
in-session renegotiation.

If you are unable to patch and unable to roll our a newer version of
OpenSSL, and you rely on Client Side Authentication with Certificates
then we recommend that you 1) ensure that you limit your configuration
to a single 'SSLClient require' on VirtualHost/Sever level and 2)
remove all other (re)negotiation/require directives. However this does
NOT fully protect you - it just curtails authentication in this
specific setting.



1: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3555
2: http://www.links.org/?p=780, http://extendedsubset.com/?p=8
3: http://www.openssl.org/source/
openssl-announce mailing list on
http://www.openssl.org/support/community.html
4: http://www.ietf.org/mail-archive/web/tls/current/msg03963.html
5: svn diff -r833581:833594 https://svn.apache.org/repos/asf/
httpd/httpd/trunk/modules/ssl

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Subject User Time
CVE-2009-3555 - apache/mod_ssl vulnerability and mitigation dirkx at apache Nov 6, 2009, 5:32 PM

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