Date: Fri, 23 Jun 2017 12:24:47 -0400 From: Leo Famulari <leo@...ulari.name> To: oss-security@...ts.openwall.com Cc: Damien Doligez <damien.doligez@...ia.fr>, Anil Madhavapeddy <anil@...oil.org> Subject: Re: CVE-2017-9772: OCaml release 4.04.2 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 > Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)
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