From owner-svn-src-all@freebsd.org Tue Sep 15 20:55:14 2020 Return-Path: Delivered-To: svn-src-all@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 5A9FD3DFFA9; Tue, 15 Sep 2020 20:55:14 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Brb8f1mcsz4dPl; Tue, 15 Sep 2020 20:55:14 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 214DCE426; Tue, 15 Sep 2020 20:55:14 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 08FKtEIn015736; Tue, 15 Sep 2020 20:55:14 GMT (envelope-from markj@FreeBSD.org) Received: (from markj@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 08FKtDl6015735; Tue, 15 Sep 2020 20:55:13 GMT (envelope-from markj@FreeBSD.org) Message-Id: <202009152055.08FKtDl6015735@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: markj set sender to markj@FreeBSD.org using -f From: Mark Johnston Date: Tue, 15 Sep 2020 20:55:13 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r365772 - stable/12/libexec/ftpd X-SVN-Group: stable-12 X-SVN-Commit-Author: markj X-SVN-Commit-Paths: stable/12/libexec/ftpd X-SVN-Commit-Revision: 365772 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Sep 2020 20:55:14 -0000 Author: markj Date: Tue Sep 15 20:55:13 2020 New Revision: 365772 URL: https://svnweb.freebsd.org/changeset/base/365772 Log: MFC r365771: ftpd: Exit during authentication if an error occurs after chroot(). admbug: 969 Security: CVE-2020-7468 Modified: stable/12/libexec/ftpd/ftpd.c Directory Properties: stable/12/ (props changed) Modified: stable/12/libexec/ftpd/ftpd.c ============================================================================== --- stable/12/libexec/ftpd/ftpd.c Tue Sep 15 20:54:18 2020 (r365771) +++ stable/12/libexec/ftpd/ftpd.c Tue Sep 15 20:55:13 2020 (r365772) @@ -1595,13 +1595,20 @@ skip: * (uid 0 has no root power over NFS if not mapped explicitly.) */ if (seteuid(pw->pw_uid) < 0) { - reply(550, "Can't set uid."); - goto bad; + if (guest || dochroot) { + fatalerror("Can't set uid."); + } else { + reply(550, "Can't set uid."); + goto bad; + } } + /* + * Do not allow the session to live if we're chroot()'ed and chdir() + * fails. Otherwise the chroot jail can be escaped. + */ if (chdir(homedir) < 0) { if (guest || dochroot) { - reply(550, "Can't change to base directory."); - goto bad; + fatalerror("Can't change to base directory."); } else { if (chdir("/") < 0) { reply(550, "Root is inaccessible.");