From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Original-To: caml-list@sympa.inria.fr Delivered-To: caml-list@sympa.inria.fr Received: from mail3-relais-sop.national.inria.fr (mail3-relais-sop.national.inria.fr [192.134.164.104]) by sympa.inria.fr (Postfix) with ESMTPS id DA5EB8018B; Fri, 23 Jun 2017 17:18:44 +0200 (CEST) X-IronPort-AV: E=Sophos;i="5.39,378,1493676000"; d="scan'208";a="229416012" Received: from ec-ap-2-13-07.paris.inria.fr (HELO [192.168.1.2]) ([128.93.65.24]) by mail3-relais-sop.national.inria.fr with ESMTP/TLS/DHE-RSA-AES256-SHA; 23 Jun 2017 17:18:44 +0200 From: Damien Doligez Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Message-Id: <21771A83-D685-4776-9CE7-883775F05977@inria.fr> Date: Fri, 23 Jun 2017 17:18:44 +0200 To: caml announce , caml users Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) X-Mailer: Apple Mail (2.3124) Subject: [Caml-list] OCaml release 4.04.2 Dear OCaml users, We have the pleasure of celebrating the birthday of Alan Turing by announcing the release of OCaml version 4.04.2. This minor release fixes the security issue described in CVE-2017-9772 (included below). All users should eventually upgrade to 4.04.2 from 4.04.0 and 4.04.1. Any user who produces setuid programs with OCaml should read the CVE and upgrade immediately. It is available as an OPAM switch, or as a source download here: https://caml.inria.fr/pub/distrib/ocaml-4.04/ https://github.com/ocaml/ocaml/archive/4.04.2.tar.gz Happy hacking, -- Damien Doligez for the OCaml team. OCaml 4.04.2 (23 Jun 2017): --------------------------- ### Security fix: - PR#7557: Local privilege escalation issue with ocaml binaries. (Damien Doligez, report by Eric Milliken, review by Xavier Leroy) -------------------------------------------------------------------- CVE-2017-9772: Privilege escalation in OCaml runtime for SUID executables The environment variables CAML_CPLUGINS, CAML_NATIVE_CPLUGINS, and CAML_BYTE_CPLUGINS can be used to auto-load code into any ocamlopt-compiled executable or any ocamlc-compiled executable in =E2=80=98custom runtime mod= e=E2=80=99. This can lead to privilege escalation if the executable is marked setuid. Vulnerable versions: OCaml 4.04.0 and 4.04.1 Workarounds: - Upgrade to OCaml 4.04.2 or higher. or - Compile the OCaml distribution with the "-no-cplugins" configure optio= n. or - OPAM users can "opam update && opam switch recompile 4.04.1", as the repository has had backported patches applied. Impact: This only affects binaries that have been installed on Unix-like operating systems (including Linux and macOS) with the setuid bit set. However, in that situation, any user who execute the program gains all the privileges of the owner of the executable (meaning that root-owned setuid executables provide root access). Fix: OCaml 4.04.2 mitigates this by modifying Sys.getenv and Unix.getenv to raise an exception if the process has ever had elevated privileges. The OCaml runtime has also been modified to use this function for retrieving all of the runtime environment variables which could potentially cause files to be accessed or modified. The older behaviour is available in Sys.unsafe_getenv for applications that require strict compatibility. Credits: This was originally reported by Eric Milliken on the OCaml Mantis bug tracker. https://caml.inria.fr/mantis/view.php?id=3D7557 References: see CVE-2017-9779 for a lesser vulnerability in older versions. CVSS v2 Vector: AV:L/AC:L/Au:S/C:C/I:C/A:N/E:F/RL:OF/RC:C/CDP:H/TD:L/CR:H/IR:H/AR:L CWE ID: 114