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