From nobody Thu Nov 6 21:10:34 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1543828407158440.8478661688787; Mon, 3 Dec 2018 01:13:27 -0800 (PST) Received: from localhost ([::1]:47501 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gTkI9-0004bQ-Of for importer@patchew.org; Mon, 03 Dec 2018 04:13:25 -0500 Received: from eggs.gnu.org ([208.118.235.92]:59651) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gTkFD-0007Fp-Um for qemu-devel@nongnu.org; Mon, 03 Dec 2018 04:10:30 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gTk4x-0002JL-Jg for qemu-devel@nongnu.org; Mon, 03 Dec 2018 03:59:50 -0500 Received: from mx1.redhat.com ([209.132.183.28]:48418) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gTk4v-0002H5-KU for qemu-devel@nongnu.org; Mon, 03 Dec 2018 03:59:47 -0500 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 44F75308424D; Mon, 3 Dec 2018 08:59:43 +0000 (UTC) Received: from sirius.home.kraxel.org (ovpn-116-59.ams2.redhat.com [10.36.116.59]) by smtp.corp.redhat.com (Postfix) with ESMTP id 609C9271A7; Mon, 3 Dec 2018 08:59:39 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 9A7129D92; Mon, 3 Dec 2018 09:59:38 +0100 (CET) From: Gerd Hoffmann To: qemu-devel@nongnu.org Date: Mon, 3 Dec 2018 09:59:38 +0100 Message-Id: <20181203085938.10247-3-kraxel@redhat.com> In-Reply-To: <20181203085938.10247-1-kraxel@redhat.com> References: <20181203085938.10247-1-kraxel@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.40]); Mon, 03 Dec 2018 08:59:43 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH for-3.1 v2 2/2] usb-mtp: outlaw slashes in filenames X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: public@hansmi.ch, Gerd Hoffmann Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Slash is unix directory separator, so they are not allowed in filenames. Note this also stops the classic escape via "../". Fixes: CVE-2018-16867 Reported-by: Michael Hanselmann Signed-off-by: Gerd Hoffmann Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- hw/usb/dev-mtp.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/hw/usb/dev-mtp.c b/hw/usb/dev-mtp.c index 0f6a9702ef..e340a2c6e3 100644 --- a/hw/usb/dev-mtp.c +++ b/hw/usb/dev-mtp.c @@ -1719,6 +1719,12 @@ static void usb_mtp_write_metadata(MTPState *s) =20 filename =3D utf16_to_str(dataset->length, dataset->filename); =20 + if (strchr(filename, '/')) { + usb_mtp_queue_result(s, PARAMETER_NOT_SUPPORTED, d->trans, + 0, 0, 0, 0); + return; + } + o =3D usb_mtp_object_lookup_name(p, filename, dataset->length); if (o !=3D NULL) { next_handle =3D o->handle; --=20 2.9.3