[ASA-201803-3] dhclient: denial of service

[Santiago Torres-Arias]

Arch Linux Security Advisory ASA-201803-3
=========================================

Severity: High
Date    : 2018-03-05
CVE-ID  : CVE-2018-5732
Package : dhclient
Type    : denial of service
Remote  : Yes
Link    : https://security.archlinux.org/AVG-648

Summary
=======

The package dhclient before version 4.4.1-1 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 4.4.1-1.

# pacman -Syu "dhclient>=4.4.1-1"

The problem has been fixed upstream in version 4.4.1.

Workaround
==========

None.

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

An out-of-bound memory access flaw was found in the way dhclient
processed a DHCP response packet. A malicious DHCP server could
potentially use this flaw to crash dhclient processes running on DHCP
client machines via a crafted DHCP response packet.

Impact
======

A remote attacker is able to crash the dhclient processes via a crafted
DHCP response packet.

References
==========

https://kb.isc.org/article/AA-01565
https://lists.isc.org/pipermail/dhcp-announce/2018-February/000418.html
https://source.isc.org/cgi-bin/gitweb.cgi?p=dhcp.git;a=commitdiff;h=c5931725b48b121d232df4ba9e45bc41e0ba114d
https://bugs.isc.org/Public/Bug/Display.html?id=47139
https://security.archlinux.org/CVE-2018-5732
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