Arch Linux: ASA-202110-3 Medium Severity: Libtirpc Denial Of Service

Arch Linux Security Advisory ASA-201705-5
========================================
Severity: Medium
Date    : 2017-05-07
CVE-ID  : CVE-2017-8779
Package : libtirpc
Type    : denial of service
Remote  : Yes
Link    : https://security.archlinux.org/AVG-262

Summary
======
The package libtirpc before version 1.0.1-3 is vulnerable to denial of
service.

Resolution
=========
Upgrade to 1.0.1-3.

# pacman -Syu "libtirpc>=1.0.1-3"

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