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Gentoo Linux Security Advisory                           GLSA 201706-07
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: Libtirpc and RPCBind: Denial of Service
     Date: June 06, 2017
     Bugs: #617472
       ID: 201706-07

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Synopsis
========

A vulnerability has been found in Libtirpc and RPCBind which may allow
a remote attacker to cause a Denial of Service condition.

Background
==========

The RPCBind utility is a server that converts RPC program numbers into
universal addresses.

Libtirpc is a port of Suns Transport-Independent RPC library to Linux.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  net-nds/rpcbind             < 0.2.4-r                 >= 0.2.4-r
  2  net-libs/libtirpc           < 1.0.1-r1               >= 1.0.1-r1
    -------------------------------------------------------------------
     2 affected packages

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

It was found that due to the way RPCBind uses libtirpc (libntirpc), a
memory leak can occur when parsing specially crafted XDR messages.

Impact
======

A remote attacker could send thousands of messages to RPCBind, possibly
resulting in a Denial of Service condition.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All RPCBind users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-nds/rpcbind-0.2.4-r"

All Libtirpc users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-libs/libtirpc-1.0.1-r1"

References
==========

[ 1 ] CVE-2017-8779
      https://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-8779

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

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

 https://security.gentoo.org/glsa/201706-07

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.

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


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