Apache-SSL optional client certificate vulnerability
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Synopsis
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If configured with SSLVerifyClient set to 1 or 3 (client certificates
optional) and SSLFakeBasicAuth, Apache-SSL 1.3.28+1.52 and all earlier
versions would permit a client to use real basic authentication to
forge a client certificate.

All the attacker needed is the "one-line DN" of a valid user, as used
by faked basic auth in Apache-SSL, and the fixed password ("password"
by default).

Fix
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Install Apache-SSL 1.3.29+1.53 from the usual places (see
http://www.apache-ssl.org/).

Credits
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This vulnerability was found and reported by Wietse Venema.