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FreeBSD-SA-00:80                                           Security Advisory

                                                                FreeBSD, Inc.



Topic:          halflifeserver allows remote code execution



Category:       ports

Module:         halflifeserver

Announced:      2000-12-20

Credits:        Mark Cooper

Affects:        Ports collection prior to the correction date.

Corrected:      2000-11-29

Vendor status:  Updated version released

FreeBSD only:   NO



I.   Background



halflifeserver is a dedicated server for hosting Half-Life games.



II.  Problem Description



The halflifeserver port, versions prior to 3.1.0.4, contains local and

remote vulnerabilities through buffer overflows and format string

vulnerabilities.  These vulnerabilities may allow remote users to

execute arbitrary code as the user running halflifeserver.



The halflifeserver port is not installed by default, nor is it "part

of FreeBSD" as such: it is part of the FreeBSD ports collection, which

contains over 4200 third-party applications in a ready-to-install

format.  The ports collections shipped with FreeBSD 3.5.1 and 4.2

contain this problem since it was discovered after the releases.



FreeBSD makes no claim about the security of these third-party

applications, although an effort is underway to provide a security

audit of the most security-critical ports.



III. Impact



Malicious remote users may execute arbitrary code as the user running

the halflifeserver software.



If you have not chosen to install the halflifeserver port/package,

then your system is not vulnerable to this problem.



IV.  Workaround



Deinstall the halflifeserver port/package, if you have installed it.



V.   Solution



One of the following:



1) Upgrade your entire ports collection and rebuild the halflifeserver

port.



2) download a new port skeleton for the halflifeserver port from:



http://www.freebsd.org/ports/



and use it to rebuild the port. Due to license restrictions no binary

package is provided for the halflifeserver port.



3) Use the portcheckout utility to automate option (2) above. The

portcheckout port is available in /usr/ports/devel/portcheckout or the

package can be obtained from:



http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/devel/portcheckout-2.0.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/devel/portcheckout-2.0.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/devel/portcheckout-2.0.tgz



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