[arch-security] [ASA-201610-17] ocaml: information disclosure

[Christian Rebischke]

Arch Linux Security Advisory ASA-201610-17
==========================================

Severity: Medium
Date    : 2016-10-24
CVE-ID  : CVE-2015-8869
Package : ocaml
Type    : information disclosure
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE

Summary
=======

The package ocaml before version 4.03.0-1 is vulnerable to information
disclosure.

Resolution
==========

Upgrade to 4.03.0-1.

# pacman -Syu "ocaml>=4.03.0-1"

The problem has been fixed upstream in version 4.03.0.

Workaround
==========

None.

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

OCaml versions 4.02.3 and earlier have a runtime bug that, on 64-bit
platforms, causes sizes arguments to an internal memmove call to be
sign-extended from 32 to 64-bits before being passed to the memmove
function.
This leads arguments between 2GiB and 4GiB to be interpreted as larger
than they are (specifically, a bit below 2^64), causing a buffer
overflow. Arguments between 4GiB and 6GiB are interpreted as 4GiB
smaller than they should be, causing a possible information leak.

Impact
======

A remote attacker is able to access sensitive information or crash the
application.

References
==========

http://www.openwall.com/lists/oss-security/2016/04/29/6
https://access.redhat.com/security/cve/CVE-2015-8869
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