!24 [sync] PR-23: Fix CVE-2022-0547
From: @openeuler-sync-bot Reviewed-by: @small_leek Signed-off-by: @small_leek
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CVE-2022-0547.patch
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107
CVE-2022-0547.patch
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From 58ec3bb4aac77131118dbbc39a65181e7847adee Mon Sep 17 00:00:00 2001
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From: David Sommerseth <davids@openvpn.net>
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Date: Tue, 15 Mar 2022 16:53:43 +0100
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Subject: [PATCH] plug-ins: Disallow multiple deferred authentication plug-ins
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The plug-in API in OpenVPN 2.x is not designed for running multiple
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deferred authentication processes in parallel. The authentication
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results of such configurations are not to be trusted. For now we bail
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out when this discovered with an error in the log.
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This is a backport of commit 282ddbac54f8d4923844f699 (master), taking
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the different man-page format into account. The code change is the same.
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CVE: 2022-0547
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Signed-off-by: David Sommerseth <davids@openvpn.net>
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Acked-by: Gert Doering <gert@greenie.muc.de>
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Message-Id: <20220315155344.37787-3-openvpn@sf.lists.topphemmelig.net>
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URL: https://www.mail-archive.com/search?l=mid&q=20220315155344.37787-3-openvpn@sf.lists.topphemmelig.net
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Signed-off-by: Gert Doering <gert@greenie.muc.de>
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---
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doc/openvpn.8 | 13 +++++++++++++
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src/openvpn/plugin.c | 33 ++++++++++++++++++++++++++++++---
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2 files changed, 43 insertions(+), 3 deletions(-)
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diff --git a/doc/openvpn.8 b/doc/openvpn.8
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index 598d5fce5..7f773b695 100644
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--- a/doc/openvpn.8
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+++ b/doc/openvpn.8
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@@ -2805,6 +2805,19 @@ function (such as tls\-verify, auth\-user\-pass\-verify, or
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client\-connect), then
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every module and script must return success (0) in order for
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the connection to be authenticated.
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+
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+.INDENT 7.0
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+.TP
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+.B \fBWARNING\fP:
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+Plug\-ins may do deferred execution, meaning the plug\-in will
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+return the control back to the main OpenVPN process and provide
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+the plug\-in result later on via a different thread or process.
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+OpenVPN does \fBNOT\fP support multiple authentication plug\-ins
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+\fBwhere more than one plugin\fP tries to do deferred authentication.
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+If this behaviour is detected, OpenVPN will shut down upon first
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+authentication.
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+.UNINDENT
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+.UNINDENT
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.\"*********************************************************
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.TP
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.B \-\-keying\-material\-exporter label len
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diff --git a/src/openvpn/plugin.c b/src/openvpn/plugin.c
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index 0ab99ab5c..5ba1c2470 100644
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--- a/src/openvpn/plugin.c
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+++ b/src/openvpn/plugin.c
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@@ -809,7 +809,7 @@ plugin_call_ssl(const struct plugin_list *pl,
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const int n = plugin_n(pl);
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bool success = false;
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bool error = false;
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- bool deferred = false;
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+ bool deferred_auth_done = false;
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setenv_del(es, "script_type");
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envp = make_env_array(es, false, &gc);
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@@ -834,7 +834,34 @@ plugin_call_ssl(const struct plugin_list *pl,
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break;
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case OPENVPN_PLUGIN_FUNC_DEFERRED:
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- deferred = true;
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+ if ((type == OPENVPN_PLUGIN_AUTH_USER_PASS_VERIFY)
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+ && deferred_auth_done)
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+ {
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+ /*
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+ * Do not allow deferred auth if a deferred auth has
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+ * already been started. This should allow a single
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+ * deferred auth call to happen, with one or more
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+ * auth calls with an instant authentication result.
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+ *
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+ * The plug-in API is not designed for multiple
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+ * deferred authentications to happen, as the
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+ * auth_control_file file will be shared across all
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+ * the plug-ins.
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+ *
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+ * Since this is considered a critical configuration
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+ * error, we bail out and exit the OpenVPN process.
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+ */
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+ error = true;
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+ msg(M_FATAL,
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+ "Exiting due to multiple authentication plug-ins "
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+ "performing deferred authentication. Only one "
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+ "authentication plug-in doing deferred auth is "
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+ "allowed. Ignoring the result and stopping now, "
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+ "the current authentication result is not to be "
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+ "trusted.");
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+ break;
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+ }
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+ deferred_auth_done = true;
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break;
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default:
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@@ -858,7 +885,7 @@ plugin_call_ssl(const struct plugin_list *pl,
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{
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return OPENVPN_PLUGIN_FUNC_ERROR;
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}
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- else if (deferred)
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+ else if (deferred_auth_done)
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{
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return OPENVPN_PLUGIN_FUNC_DEFERRED;
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}
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@ -1,12 +1,14 @@
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Name: openvpn
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Version: 2.4.8
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Release: 6
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Release: 7
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Summary: A full-featured open source SSL VPN solution
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License: GPLv2 and OpenSSL and SSLeay
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URL: https://community.openvpn.net/openvpn
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Source0: https://swupdate.openvpn.org/community/releases/openvpn-%{version}.tar.gz
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Patch0000: CVE-2020-11810.patch
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Patch0001: CVE-2020-15078.patch
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# https://github.com/OpenVPN/openvpn/commit/58ec3bb
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Patch0002: CVE-2022-0547.patch
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BuildRequires: openssl-devel lz4-devel systemd-devel lzo-devel gcc
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BuildRequires: iproute pam-devel pkcs11-helper-devel >= 1.11
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@ -123,6 +125,9 @@ fi
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%{_mandir}/man8/%{name}.8*
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%changelog
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* Wed Mar 30 2022 wangkai <wangkai385@huawei.com> - 2.4.8-7
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- Fix CVE-2022-0547
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* Wed Jun 9 2021 zhaoyao <zhaoyao32@huawei.com> - 2.4.8-6
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- fix faileds: /bin/sh: gcc: command not found.
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