[arch-security] [ASA-201705-6] lib32-libtirpc: denial of service

[Levente Polyak]

Arch Linux Security Advisory ASA-201705-6
=========================================

Severity: Medium
Date    : 2017-05-07
CVE-ID  : CVE-2017-8779
Package : lib32-libtirpc
Type    : denial of service
Remote  : Yes
Link    : https://security.archlinux.org/AVG-263

Summary
=======

The package lib32-libtirpc before version 1.0.1-2 is vulnerable to
denial of service.

Resolution
==========

Upgrade to 1.0.1-2.

# pacman -Syu "lib32-libtirpc>=1.0.1-2"

The problem has been fixed upstream but no release is available yet.

Workaround
==========

None.

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

It was found that libtirpc and libntirpc fails to free a buffer
allocated for parsing XDR blocks when parsing fails due to insufficient
input data being available. A specially crafted message sent to a
service such as rpcbind results in a memory leak, causing the
application to crash or other processes to be impacted via the OOM
killer.

Impact
======

A remote attacker is able to send specially crafted input to leak
memory, possibly leading to denial of service.

References
==========

https://bugs.archlinux.org/task/53928
https://guidovranken.wordpress.com/2017/05/03/rpcbomb-remote-rpcbind-denial-of-service-patches/
https://security.archlinux.org/CVE-2017-8779

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