-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
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
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (Darwin)
iQCVAwUBSvTOITGmPZbsFAuBAQKpXgQAgoBq0FjmnFwxBYjZQ05cPgHYzE+rBQHg
f142MZWXreBoZyB1pV2CJpmf7BWtmBKQgKIMwk3fWfRs33rvnjhEWjrMBFA4ID8J
0CBLmiwBVxLfCTj7YIBJ71VPn4Mw3iviiIUb1qrW0RaOjGgf4j2ffsapnlpR6lR9
JHDVPFBXl8s=
=OYuY
-----END PGP SIGNATURE-----
Hash: SHA1
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
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (Darwin)
iQCVAwUBSvTOITGmPZbsFAuBAQKpXgQAgoBq0FjmnFwxBYjZQ05cPgHYzE+rBQHg
f142MZWXreBoZyB1pV2CJpmf7BWtmBKQgKIMwk3fWfRs33rvnjhEWjrMBFA4ID8J
0CBLmiwBVxLfCTj7YIBJ71VPn4Mw3iviiIUb1qrW0RaOjGgf4j2ffsapnlpR6lR9
JHDVPFBXl8s=
=OYuY
-----END PGP SIGNATURE-----