Security update for the DHCP server

Knowledgebase

(Last modified: 18MAY2004)

solutions Security update for the DHCP server SuSE Linux Maintenance Web (9567effd77aa719e3132a4c89fd99271)

Applies to

Package: dhcp-server
Product(s): SUSE LINUX Retail Solution 8
SuSE Linux School Server for i386
SuSE Linux Standard Server 8
SuSE Linux Enterprise Server 8 for x86
SuSE Linux Enterprise Server 8 for IPF
SuSE Linux Enterprise Server 8 for IBM iSeries and IBM pSeries
SuSE Linux Enterprise Server 8 for IBM S/390 and IBM zSeries
SuSE Linux Enterprise Server 8 for IBM zSeries
SuSE Linux Enterprise Server 8 for AMD64
SuSE Linux Openexchange Server 4

Release: 20040518
Obsoletes: none

Indications

Everybody using the DHCP server should install this update.

Contraindications

None.

Problem description

This update fixes insecure temp file handling by the DHCP server. The dhcp
server used easily guessable filenames when creating a new lease file in the
directory /var/lib/dhcp. Since the directory is owned by the nobody
user, another process running under the same user id could trick the server
(which initially runs as root when starting up) into overwriting arbitrary
files via a symlink attack. This update provides a fix.

Solution

Please install the updates provided at the location noted below.

Installation notes

This update is provided as an RPM package that can easily be installed onto a running system by using this command:


rpm -Fvh dhcp-server.rpm

To make the change effective, use the command:


rcdhcpd restart

links to download packages

Download Source Packages

Download the source code of the patches for maintained products.

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