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openvpn -- multiple TCP clients connecting with the same certificate at the same time can crash the server

Description:

James Yonan reports:

If two or more client machines try to connect to the server at the same time via TCP, using the same client certificate, and when --duplicate-cn is not enabled on the server, a race condition can crash the server with "Assertion failed at mtcp.c:411"

References:

Affects:

portaudit: openvpn -- multiple TCP clients connecting with the same certificate at the same time can crash the server

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If you have found a vulnerability in a FreeBSD port not listed in the database, please contact the FreeBSD Security Officer. Refer to "FreeBSD Security Information" for more information.


Oliver Eikemeier <eik@FreeBSD.org>