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Gentoo Linux Security Advisory                           GLSA 201702-15
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: OCaml: Buffer overflow and information disclosure
     Date: February 20, 2017
     Bugs: #581946
       ID: 201702-15

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Synopsis
========

A buffer overflow in OCaml might allow remote attackers to obtain
sensitive information or crash an OCaml-based application.

Background
==========

OCaml is a high-level, strongly-typed, functional, and object-oriented
programming language from the ML family of languages.

Affected packages
=================

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  dev-lang/ocaml               < 4.04.0                  >= 4.04.0

Description
===========

It was discovered that OCaml was vulnerable to a runtime bug that, on
64-bit platforms, causes size arguments to internal memmove calls to be
sign-extended from 32- to 64-bits before being passed to the memmove
function. This leads to arguments between 2GiB and 4GiB being
interpreted as larger than they are (specifically, a bit below 2^64),
causing a buffer overflow. Further, arguments between 4GiB and 6GiB are
interpreted as 4GiB smaller than they should be causing a possible
information leak.

Impact
======

A remote attacker, able to interact with an OCaml-based application,
could possibly obtain sensitive information or cause a Denial of
Service condition.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All OCaml users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=dev-lang/ocam-4.04.0"

Packages which depend on OCaml may need to be recompiled. Tools such as
qdepends (included in app-portage/portage-utils) may assist in
identifying these packages:

  # emerge -1 -a -v $(qdepends -CQ dev-lang/ocaml | sed 's/^/=/')

References
==========

[ 1 ] CVE-2015-8869
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-8869

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

 https://security.gentoo.org/glsa/201702-15

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2017 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5


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