From nobody Mon Feb 9 06:34:30 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of groups.io designates 66.175.222.12 as permitted sender) client-ip=66.175.222.12; envelope-from=bounce+27952+54418+1787277+3901457@groups.io; helo=web01.groups.io; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of groups.io designates 66.175.222.12 as permitted sender) smtp.mailfrom=bounce+27952+54418+1787277+3901457@groups.io; dmarc=fail(p=none dis=none) header.from=intel.com Received: from web01.groups.io (web01.groups.io [66.175.222.12]) by mx.zohomail.com with SMTPS id 1581665269236222.76826003910617; Thu, 13 Feb 2020 23:27:49 -0800 (PST) Return-Path: X-Received: by 127.0.0.2 with SMTP id qKQYYY1788612x0Gt0qFtVHW; Thu, 13 Feb 2020 23:27:48 -0800 X-Received: from mga04.intel.com (mga04.intel.com []) by mx.groups.io with SMTP id smtpd.web11.3343.1581665266656025367 for ; Thu, 13 Feb 2020 23:27:48 -0800 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 13 Feb 2020 23:27:47 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,439,1574150400"; d="scan'208";a="347904206" X-Received: from shwdeopensfp777.ccr.corp.intel.com ([10.239.158.78]) by fmsmga001.fm.intel.com with ESMTP; 13 Feb 2020 23:27:47 -0800 From: "Wang, Jian J" To: devel@edk2.groups.io Cc: Jiewen Yao , Chao Zhang , Laszlo Ersek Subject: [edk2-devel] [PATCH v2 02/10] SecurityPkg/DxeImageVerificationLib: reject CertStack.CertNumber==0 per DBX(CVE-2019-14575) Date: Fri, 14 Feb 2020 15:27:37 +0800 Message-Id: <20200214072745.1570-3-jian.j.wang@intel.com> In-Reply-To: <20200214072745.1570-1-jian.j.wang@intel.com> References: <20200214072745.1570-1-jian.j.wang@intel.com> MIME-Version: 1.0 Precedence: Bulk List-Unsubscribe: Sender: devel@edk2.groups.io List-Id: Mailing-List: list devel@edk2.groups.io; contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,jian.j.wang@intel.com X-Gm-Message-State: jpK9IQ2glcSfY66pR2v70YlUx1787277AA= Content-Transfer-Encoding: quoted-printable DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=groups.io; q=dns/txt; s=20140610; t=1581665268; bh=1s26ZscftnB4CSKBfE9LS4IDJTxJOttW/hxLfFfNKCw=; h=Cc:Date:From:Reply-To:Subject:To; b=pC3GPW7JQIXoXAQ6yAJYmStYTIXtGImB9kPVcprTq+rA6VPtt48aARju40j+No8xmTh Mr3iAGEjO4wDr/Set6dcFgHdXkkldfIBFSoIZSvnC2M/rsk26SYiq2mUMhSwW75wuXSO0 e02GZpHWI5KLDy2/HXMvDW/u3xNd/FBEDyU= X-ZohoMail-DKIM: pass (identity @groups.io) Content-Type: text/plain; charset="utf-8" In case the signers' certificate stack, retrieved from the PE/COFF image's Authenticode blob, has zero elements (=3Dthere are zero signer certificates= ), then we should consider the image forbidden by DBX, not accepted by DBX. Cc: Jiewen Yao Cc: Chao Zhang Signed-off-by: Jian J Wang Reviewed-by: Laszlo Ersek Reviewed-by: Jiewen Yao --- .../Library/DxeImageVerificationLib/DxeImageVerificationLib.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificati= onLib.c b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationL= ib.c index 74dbffa122..5dcd6efed5 100644 --- a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c +++ b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c @@ -1326,7 +1326,7 @@ IsForbiddenByDbx ( // UINT8 Certn[]; // Pkcs7GetSigners (AuthData, AuthDataSize, &CertBuffer, &BufferLength, &Tr= ustedCert, &TrustedCertLength); - if ((BufferLength =3D=3D 0) || (CertBuffer =3D=3D NULL)) { + if ((BufferLength =3D=3D 0) || (CertBuffer =3D=3D NULL) || (*CertBuffer)= =3D=3D 0) { IsForbidden =3D TRUE; goto Done; } --=20 2.24.0.windows.2 -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#54418): https://edk2.groups.io/g/devel/message/54418 Mute This Topic: https://groups.io/mt/71264900/1787277 Group Owner: devel+owner@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [importer@patchew.org] -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-