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ApacheSSLvuln.txt

ApacheSSLvuln.txt
Posted Feb 6, 2004
Authored by Adam Laurie

If configured with SSLVerifyClient set to 1 or 3 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.

tags | advisory
SHA-256 | 451c67a07615fb41c04236b83880095a572fd4760c9b81fc36692baed757e5a0

ApacheSSLvuln.txt

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Apache-SSL optional client certificate vulnerability
----------------------------------------------------

Synopsis
--------

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
---

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

Credits
-------

This vulnerability was found and reported by Wietse Venema.

cheers,
Adam
--
Adam Laurie Tel: +44 (20) 8742 0755
A.L. Digital Ltd. Fax: +44 (20) 8742 5995
The Stores http://www.thebunker.net
2 Bath Road http://www.aldigital.co.uk
London W4 1LT mailto:adam@algroup.co.uk
UNITED KINGDOM PGP key on keyservers
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