From nobody Mon Feb 9 20:59:59 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1676978597; cv=none; d=zohomail.com; s=zohoarc; b=npXTAyGRZ0j+iqovsbEAqrA9zTCykqvRGQpkPWJsqAxc0+3auHq93fFlxbOgdOJhZ26f164GVBKfuXTVxGdXUaihZNveZTl08RdwGQxIW4LpSa3uXNOtqzOxX+ltbEfg+9hxZYtbMdjSjDTpkElRCgIJ1cX32GXU3+e4MWEQuxo= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1676978597; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=bmSzv33JtM5rJ2dxmi6R47S+TSiygz5/YE0zWVQnYm0=; b=c+BJbWwVn4T2HYfICjyXv4m/UIQ23W7ae4qNQyt218CSyz+bGNgnQsxdWBU5e4fw7wkEu1Ts11ID65CF4kHJc3Aly2gKnuhhi0ryQ9XOuN+td4P9EnyQJ3a0zvPhBmgSi+ADiSV+SztzW+qT8XpKcuKTzW+vesKqkAsJ8FOUjDo= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1676978597199917.9722891965482; Tue, 21 Feb 2023 03:23:17 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pUQj1-00058T-6Q; Tue, 21 Feb 2023 06:22:23 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pUQiy-00057Z-ME for qemu-devel@nongnu.org; Tue, 21 Feb 2023 06:22:20 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pUQix-0001tL-2K for qemu-devel@nongnu.org; Tue, 21 Feb 2023 06:22:20 -0500 Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-54-0Hd57ZyuPaWbFX-HjjWUBQ-1; Tue, 21 Feb 2023 06:22:15 -0500 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id BD9ED1C068CA; Tue, 21 Feb 2023 11:22:14 +0000 (UTC) Received: from kostyanf14nb.redhat.com (unknown [10.45.224.248]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 0A7CA140EBF6; Tue, 21 Feb 2023 11:22:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1676978538; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=bmSzv33JtM5rJ2dxmi6R47S+TSiygz5/YE0zWVQnYm0=; b=ee5lwDePQ67cohpq+CALlvfaH+Lw5OnHu3gcrZrS45a9snPa4U4qdN5CkyvQ1uZz2l7Tfo k/5UpYMORZwTNDsw3q/FS/C5Ftaipju5s5XJiDa4mIODWVO7Fw4XqjSSH7W+lPWD2eVSf4 z11AoK4uMMCtfzFqxxrkDcp6Lam2a78= X-MC-Unique: 0Hd57ZyuPaWbFX-HjjWUBQ-1 From: Konstantin Kostiuk To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Bin Meng , Stefan Weil , Yonggang Luo , Markus Armbruster , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Peter Maydell , Gerd Hoffmann , "Michael S. Tsirkin" , Thomas Huth , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , Michael Roth , Mauro Matteo Cascella , Yan Vugenfirer , Evgeny Iakovlev , Andrey Drobyshev , Xuzhou Cheng , brian.wiltse@live.com Subject: [PATCH v2 2/2] qga/win32: Use rundll for VSS installation Date: Tue, 21 Feb 2023 13:21:57 +0200 Message-Id: <20230221112157.418648-3-kkostiuk@redhat.com> In-Reply-To: <20230221112157.418648-1-kkostiuk@redhat.com> References: <20230221112157.418648-1-kkostiuk@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=kkostiuk@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1676978598677100007 Content-Type: text/plain; charset="utf-8" The custom action uses cmd.exe to run VSS Service installation and removal which causes an interactive command shell to spawn. This shell can be used to execute any commands as a SYSTEM user. Even if call qemu-ga.exe directly the interactive command shell will be spawned as qemu-ga.exe is a console application and used by users from the console as well as a service. As VSS Service runs from DLL which contains the installer and uninstaller code, it can be run directly by rundll32.exe without any interactive command shell. Add specific entry points for rundll which is just a wrapper for COMRegister/COMUnregister functions with proper arguments. resolves: https://bugzilla.redhat.com/show_bug.cgi?id=3D2167423 fixes: CVE-2023-0664 Signed-off-by: Konstantin Kostiuk Reviewed-by: Yan Vugenfirer --- qga/installer/qemu-ga.wxs | 10 +++++----- qga/vss-win32/install.cpp | 9 +++++++++ qga/vss-win32/qga-vss.def | 2 ++ 3 files changed, 16 insertions(+), 5 deletions(-) diff --git a/qga/installer/qemu-ga.wxs b/qga/installer/qemu-ga.wxs index feb629ec47..46ae9e7a13 100644 --- a/qga/installer/qemu-ga.wxs +++ b/qga/installer/qemu-ga.wxs @@ -127,22 +127,22 @@ - + diff --git a/qga/vss-win32/install.cpp b/qga/vss-win32/install.cpp index b57508fbe0..68662a6dfc 100644 --- a/qga/vss-win32/install.cpp +++ b/qga/vss-win32/install.cpp @@ -357,6 +357,15 @@ out: return hr; } +STDAPI_(void) CALLBACK DLLCOMRegister(HWND, HINSTANCE, LPSTR, int) +{ + COMRegister(); +} + +STDAPI_(void) CALLBACK DLLCOMUnregister(HWND, HINSTANCE, LPSTR, int) +{ + COMUnregister(); +} static BOOL CreateRegistryKey(LPCTSTR key, LPCTSTR value, LPCTSTR data) { diff --git a/qga/vss-win32/qga-vss.def b/qga/vss-win32/qga-vss.def index 927782c31b..ee97a81427 100644 --- a/qga/vss-win32/qga-vss.def +++ b/qga/vss-win32/qga-vss.def @@ -1,6 +1,8 @@ LIBRARY "QGA-PROVIDER.DLL" EXPORTS + DLLCOMRegister + DLLCOMUnregister COMRegister PRIVATE COMUnregister PRIVATE DllCanUnloadNow PRIVATE -- 2.25.1