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1dde0cd6e5
We didn't check the return value of ASN1_STRING_to_UTF8() in extract_x509_extension(). Ignoring such a failure could result in buf being free'd twice. An error in ASN1_STRING_to_UTF8() can be caused remotely if the peer can make the local process run out of memory. The problem can only be triggered for configurations that use the --x509-alt-username option with an x509 extension (i.e. the option parameter starts with "ext:"). This issue was discovered, analysed and reported to the OpenVPN team by Guido Vranken. Extensive testing by Guido Vranken gives confidence that this function is very unlikely to fail in real-world usage (using subjectAltName or issuerAltName extensions) for other reasons than memory exhaustion. CVE: 2017-7521 Signed-off-by: Steffan Karger <steffan.karger@fox-it.com> Acked-by: Gert Doering <gert@greenie.muc.de> Acked-by: David Sommerseth <davids@openvpn.net> Acked-by: Guido Vranken <guidovranken@gmail.com> Message-Id: <1497864520-12219-6-git-send-email-steffan.karger@fox-it.com> URL: https://www.mail-archive.com/search?l=mid&q=1497864520-12219-6-git-send-email-steffan.karger@fox-it.com Signed-off-by: Gert Doering <gert@greenie.muc.de> (cherry picked from commit cb4e35ece4a5b70b10ef9013be3bff263d82f32b)
OpenVPN -- A Secure tunneling daemon Copyright (C) 2002-2010 OpenVPN Technologies, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. ************************************************************************* To get the latest release of OpenVPN, go to: https://openvpn.net/index.php/download/community-downloads.html To Build and Install, tar -zxf openvpn-<version>.tar.gz cd openvpn-<version> ./configure make make install or see the file INSTALL for more info. ************************************************************************* For detailed information on OpenVPN, including examples, see the man page http://openvpn.net/man.html For a sample VPN configuration, see http://openvpn.net/howto.html To report an issue, see https://community.openvpn.net/openvpn/report For a description of OpenVPN's underlying protocol, see the file ssl.h included in the source distribution. ************************************************************************* Other Files & Directories: * INSTALL-win32.txt -- installation instructions for Windows * configure.ac -- script to rebuild our configure script and makefile. * sample/sample-scripts/verify-cn A sample perl script which can be used with OpenVPN's --tls-verify option to provide a customized authentication test on embedded X509 certificate fields. * sample/sample-keys/ Sample RSA keys and certificates. DON'T USE THESE FILES FOR ANYTHING OTHER THAN TESTING BECAUSE THEY ARE TOTALLY INSECURE. * sample/sample-config-files/ A collection of OpenVPN config files and scripts from the HOWTO at http://openvpn.net/howto.html ************************************************************************* Note that easy-rsa and tap-windows are now maintained in their own subprojects. Their source code is available here: https://github.com/OpenVPN/easy-rsa https://github.com/OpenVPN/tap-windows The old cross-compilation environment (domake-win) and the Python-based buildsystem have been replaced with openvpn-build: https://github.com/OpenVPN/openvpn-build See the INSTALL file for usage information.