full-disclosure - MDKSA-2005:145 - Updated openvpn packages fix several vulnerabilities

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Date: Tue Aug 23 01:44:49 2005
From: security at mandriva.com (Mandriva Security Team)
Subject: MDKSA-2005:145 - Updated openvpn packages fix
	several vulnerabilities

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 _______________________________________________________________________

                Mandriva Linux Security Update Advisory
 _______________________________________________________________________

 Package name:           openvpn
 Advisory ID:            MDKSA-2005:145
 Date:                   August 22nd, 2005

 Affected versions:	 Multi Network Firewall 2.0
 ______________________________________________________________________

 Problem Description:

 A number of vulnerabilities were discovered in OpenVPN that were fixed
 in the 2.0.1 release:

 A DoS attack against the server when run with "verb 0" and without
 "tls-auth" when a client connection to the server fails certificate
 verification, the OpenSSL error queue is not properly flushed.  This
 could result in another unrelated client instance on the server seeing
 the error and responding to it, resulting in a disconnection of the
 unrelated client (CAN-2005-2531).

 A DoS attack against the server by an authenticated client that sends
 a packet which fails to decrypt on the server, the OpenSSL error queue
 was not properly flushed.  This could result in another unrelated
 client instance on the server seeing the error and responding to it,
 resulting in a disconnection of the unrelated client (CAN-2005-2532).

 A DoS attack against the server by an authenticated client is possible
 in "dev tap" ethernet bridging mode where a malicious client could
 theoretically flood the server with packets appearing to come from
 hundreds of thousands of different MAC addresses, resulting in the
 OpenVPN process exhausting system virtual memory (CAN-2005-2533).

 If two or more client machines tried to connect to the server at the
 same time via TCP, using the same client certificate, a race condition
 could crash the server if --duplicate-cn is not enabled on the server
 (CAN-2005-2534).

 This update provides OpenVPN 2.0.1 which corrects these issues as well
 as a number of other bugs.
 _______________________________________________________________________

 References:

  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2531
  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2532
  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2533
  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2534
 ______________________________________________________________________

 Updated Packages:

 Multi Network Firewall 2.0:
 20daf4b6f9dbc1c53f3b4f4d375262d4  mnf/2.0/RPMS/openvpn-2.0.1-0.1.M20mdk.i586.rpm
 a92bbc0c8285fecfbe3f439d18a62580  mnf/2.0/SRPMS/openvpn-2.0.1-0.1.M20mdk.src.rpm
 _______________________________________________________________________

 To upgrade automatically use MandrakeUpdate or urpmi.  The verification
 of md5 checksums and GPG signatures is performed automatically for you.

 All packages are signed by Mandriva for security.  You can obtain the
 GPG public key of the Mandriva Security Team by executing:

  gpg --recv-keys --keyserver pgp.mit.edu 0x22458A98

 You can view other update advisories for Mandriva Linux at:

  http://www.mandriva.com/security/advisories

 If you want to report vulnerabilities, please contact

  security_(at)_mandriva.com
 _______________________________________________________________________

 Type Bits/KeyID     Date       User ID
 pub  1024D/22458A98 2000-07-10 Mandriva Security Team
  <security*mandriva.com>

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