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Date: Fri, 23 Jun 2017 17:33:39 +0100
From: Anil Madhavapeddy <anil@...oil.org>
To: Leo Famulari <leo@...ulari.name>
Cc: oss-security@...ts.openwall.com,
Damien Doligez <damien.doligez@...ia.fr>
Subject: Re: CVE-2017-9772: OCaml release 4.04.2
Hi Leo,
The ocaml.org <http://ocaml.org/> site is just being rebuilt in CI so it will be a few minutes
before the release is on the live site. In the meanwhile, all the distribution
tarballs are available at:
https://caml.inria.fr/pub/distrib/ocaml-4.04/ <https://caml.inria.fr/pub/distrib/ocaml-4.04/>
regards,
Anil
> On 23 Jun 2017, at 17:24, Leo Famulari <leo@...ulari.name> wrote:
>
> Hi Anil,
>
> Can you tell us where to get OCaml 4.04.2? It's not available here:
>
> https://ocaml.org/releases/
>
> On Fri, Jun 23, 2017 at 04:28:28PM +0100, Anil Madhavapeddy wrote:
>> Anyone packaging OCaml 4.04.0 or OCaml 4.04.1 and installing setuid binaries
>> with it should be aware of this CVE, and upgrade their distribution packaging
>> accordingly. Please get in touch with me if you are having any issues with
>> upgrading to the latest OCaml 4.04.2.
>>
>> Anil
>>
>>> Begin forwarded message:
>>>
>>> From: Damien Doligez <Damien.Doligez@...ia.fr>
>>> Subject: [Caml-list] OCaml release 4.04.2
>>> Date: 23 June 2017 at 16:18:44 BST
>>> To: caml announce <caml-announce@...ia.fr>, caml users <caml-list@...ia.fr>
>>> Reply-To: Damien Doligez <Damien.Doligez@...ia.fr>
>>>
>>>
>>> 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 ‘custom runtime mode’.
>>> 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 option.
>>> 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=7557
>>>
>>> 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
>>>
>>>
>>> --
>>> Caml-list mailing list. Subscription management and archives:
>>> https://sympa.inria.fr/sympa/arc/caml-list
>>> Beginner's list: http://groups.yahoo.com/group/ocaml_beginners
>>> Bug reports: http://caml.inria.fr/bin/caml-bugs
>>
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