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This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An authenticated attacker can send a malicious message in
tls-authenticated mode of OpenVPN, in order to trigger a denial of
service.

Impacted products: Debian, Fedora, MBS, openSUSE, Slackware, SUSE
Linux Enterprise Desktop, SLES, Ubuntu, Unix (platform)

Severity: 2/4

Creation date: 02/12/2014

DESCRIPTION OF THE VULNERABILITY

The OpenVPN product offers a tls-authenticated mode using X.509
certificates.

However, if a control message has a length shorter than 4 bytes,
an assertion error occurs in the key_method_2_read() function of
the src/openvpn/ssl.c file.

An authenticated attacker can therefore send a malicious message
in tls-authenticated mode of OpenVPN, in order to trigger a denial
of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/OpenVPN-denial-of-service-via-tls-authenticated-15730