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| LinuxSecurity.com Linux Advisory Watch |
| April 30th, 2004 Volume 5, Number 18a |
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Editors: Dave Wreski Benjamin Thomas
dave@private ben@private
Linux Advisory Watch is a comprehensive newsletter that outlines the
security vulnerabilities that have been announced throughout the week.
It includes pointers to updated packages and descriptions of each
vulnerability.
This week, advisories were released for eterm, mc, the Linux kernel,
ssmtp, LCDproc, xine, samba, and sysklogd. The distributors include
Debian, Guardian Digital's EnGarde Linux, Fedora, Gentoo, Mandrake, Red
Hat, and Slackware.
----
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----
Wireless Security
Over the years security and network administrators have been reluctant to
adopt wireless networking technologies in corporate environments. Will it
provide an easy path of entry into the LAN? Will internal servers be
accessible from the outside? Sometimes is necessary to implement wireless
networks in an office building because of special circumstances, or
pressures from management to adopt the latest technology. Installing a
wireless network may be inevitable, if so how should it be approached?
As with all security projects, a wireless security policy should be
created. This should define the purpose and scope of the wireless
network, who is going to be using it, how it should be used, etc. Also,
an analysis of newly introduced threats should be formalized. This will
enable the network to be designed in a matter that minimizes risk.
The wireless network should be treated as an untrusted network.
Precautions such as placing a firewall between the wireless network and
internal LAN, requiring strong authentication, and conducting regular
vulnerability assessments. When connecting to the trusted LAN over a
wireless network, a VPN should be used. If not, it is advisable to only
stick to secure protocols such as SSH & SSL.
Wireless access points should be regularly audited and configured in the
most secure manner. Passwords and WEP keys should be as defined in the
Wireless Security Policy. Also, it is important to periodically check for
rogue wireless access points by warwalking. Access points are ideally
placed in the center of buildings. This reduces the available signal
strength to outsiders.
Because the wireless workstations are on an untrusted network, it is
imperative that they are kept secure. This can be done by using
host-based firewalls, IDS, keeping patches up-to-date, and configuration
scanning. Hosts should be regularly scanned and monitored. By taking
these precautions it is possible to implement wireless networking without
significantly increasing risks to an organization's information security.
Until next time, cheers!
Benjamin D. Thomas
ben@private
----
Guardian Digital Launches Next Generation Internet
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Guardian Digital has announced the first fully open source system designed
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Digital Internet Defense & Detection System (IDDS) leverages best-in-class
open source applications to protect networks and hosts using a unique
multi-layered approach coupled with the security expertise and ongoing
security vigilance provided by Guardian Digital.
http://www.linuxsecurity.com/feature_stories/feature_story-163.html
--------------------------------------------------------------------
Interview with Siem Korteweg: System Configuration Collector
In this interview we learn how the System Configuration Collector (SCC)
project began, how the software works, why Siem chose to make it open
source, and information on future developments.
http://www.linuxsecurity.com/feature_stories/feature_story-162.html
--------------------------------------------------------------------
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+---------------------------------+
| Distribution: Debian | ----------------------------//
+---------------------------------+
4/28/2004 - kernel
2.4.16 Multiple vulnerabilities
Several serious problems have been discovered in the Linux kernel.
This update takes care of Linux 2.4.16 for the ARM (and a few
other) architectures.
http://www.linuxsecurity.com/advisories/debian_advisory-4280.html
4/29/2004 - eterm
Missing Input Sanitising
H.D. Moore discovered several terminal emulator security issues
http://www.linuxsecurity.com/advisories/debian_advisory-4287.html
4/29/2004 - mc
Several Vulnerabilities
Jacub Jelinek discovered several vulnerabilities in the Midnight
Commander, a powerful file manager for GNU/Linux systems.
http://www.linuxsecurity.com/advisories/debian_advisory-4288.html
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| Distribution: EnGarde | ----------------------------//
+---------------------------------+
4/28/2004 - 'kernel' Several security and bug fixes
Several Vulnerabilities
This update fixes numerous vulnerabilities in the Linux Kernel.
http://www.linuxsecurity.com/advisories/engarde_advisory-4285.html
4/28/2004 - kernel
Multiple vulnerabilities
This patch resolves a number of kernel vulnerabilities, uncluding
ones involving the various journaling filesystems.
http://www.linuxsecurity.com/advisories/engarde_advisory-4286.html
+---------------------------------+
| Distribution: Fedora | ----------------------------//
+---------------------------------+
4/23/2004 - kernel
Multiple vulnerabilities
This patch fixes a large variety of vulnerabilities in the 2.4.22
kernel, including some related to journaling filesystems.
http://www.linuxsecurity.com/advisories/fedora_advisory-4278.html
+---------------------------------+
| Distribution: Gentoo | ----------------------------//
+---------------------------------+
4/28/2004 - ipsec-tools and iputils Denial of service vulnerability
Multiple vulnerabilities
Attackers may be able to craft an ISAKMP header of sufficient
length to consume all available system resources, causing a Denial
of Service. Further discussion of advisory at bottom.
http://www.linuxsecurity.com/advisories/gentoo_advisory-4279.html
4/28/2004 - ssmtp
Multiple vulnerabilities
Multiple format string vulnerabilities may allow an attacker to
run arbitrary code with ssmtp's privileges.
http://www.linuxsecurity.com/advisories/gentoo_advisory-4282.html
4/28/2004 - LCDproc
Multiple vulnerabilities
Multiple remote vulnerabilities have been found in the LCDd
server, allowing execution of arbitrary code with the rights of
the LCDd user.
http://www.linuxsecurity.com/advisories/gentoo_advisory-4283.html
4/28/2004 - xine
Multiple vulnerabilities
Several vulnerabilities have been found in xine-ui and xine-lib,
potentially allowing an attacker to overwrite files with the
rights of the user.
http://www.linuxsecurity.com/advisories/gentoo_advisory-4284.html
4/29/2004 - samba
Multiple Vulnerabilities
There is a bug in smbfs which may allow local users to gain root
via a setuid file on a mounted Samba share. Also, there is a
tmpfile symlink vulnerability in the smbprint script distributed
with Samba.
http://www.linuxsecurity.com/advisories/gentoo_advisory-4289.html
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| Distribution: Mandrake | ----------------------------//
+---------------------------------+
4/28/2004 - kernel
Multiple vulnerabilities
This patch resolves a large number of kernel vulnerabilities at
various levels of seriousness.
http://www.linuxsecurity.com/advisories/mandrake_advisory-4281.html
4/29/2004 - sysklogd
Vulnerability
Steve Grubb discovered a bug in sysklogd where it allocates an
insufficient amount of memory which causes sysklogd to write to
unallocated memory.
http://www.linuxsecurity.com/advisories/mandrake_advisory-4290.html
+---------------------------------+
| Distribution: Openwall | ----------------------------//
+---------------------------------+
4/23/2004 - kernel
Privilege escalation vulnerability
Upgrade to 2.4.26 to fix a local root vulnerability.
http://www.linuxsecurity.com/advisories/openwall_advisory-4277.html
+---------------------------------+
| Distribution: Red Hat | ----------------------------//
+---------------------------------+
4/23/2004 - kernel
Privilege escalation vulnerabilities
Updated kernel packages that fix two privilege escalation
vulnerabilities are now available.
http://www.linuxsecurity.com/advisories/redhat_advisory-4276.html
+---------------------------------+
| Distribution: Slackware | ----------------------------//
+---------------------------------+
4/28/2004 - kernel
Security Issues
New kernel packages are available for Slackware 9.1 and -current
to fix security issues
http://www.linuxsecurity.com/advisories/slackware_advisory-4291.html
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