LINUX ADVISORY
WATCH - This week, advisories were released for cyrus-imapd, curl, xloadimage,
xli, PERL, slypheed, libgal2, libsoup, evolution, gimp, procps, lsof, lockdev,
xloadimage, mailman, boost, kdelibs, firefox, thunderbird, mozilla, devhelp,
epiphany, rxvt, LTris, MySQL, ethereal, ipsec-tools, and ImageMagick. The distributors
include Conectiva, Debian, Fedora, Genotoo, Mandrake, Red Hat, and SuSE.
LinuxSecurity.com
Feature Extras:
Getting
to Know Linux Security: File Permissions - Welcome to the first
tutorial in the 'Getting to Know Linux Security' series. The topic explored
is Linux file permissions. It offers an easy to follow explanation of how
to read permissions, and how to set them using chmod. This guide is intended
for users new to Linux security, therefore very simple.
The
Tao of Network Security Monitoring: Beyond Intrusion Detection
- The Tao of Network Security Monitoring is one of the most comprehensive
and up-to-date sources available on the subject. It gives an excellent introduction
to information security and the importance of network security monitoring,
offers hands-on examples of almost 30 open source network security tools,
and includes information relevant to security managers through case studies,
best practices, and recommendations on how to establish training programs
for network security staff.
Encrypting
Shell Scripts - Do you have scripts that contain sensitive information
like passwords and you pretty much depend on file permissions to keep it secure?
If so, then that type of security is good provided you keep your system secure
and some user doesn't have a "ps -ef" loop running in an attempt to capture
that sensitive info (though some applications mask passwords in "ps" output).
Bulletproof
Virus Protection - Protect your network from costly security
breaches with Guardian Digital’s multi-faceted security applications.
More then just an email firewall, on demand and scheduled scanning detects
and disinfects viruses found on the network. Click
to find out more!
Take advantage of our Linux Security discussion
list! This mailing list is for general security-related questions and comments.
To subscribe send an e-mail to security-discuss-request@linuxsecurity.com
with "subscribe" as the subject.
Thank you for reading the LinuxSecurity.com
weekly security newsletter. The purpose of this document is to provide our readers
with a quick summary of each week's most relevant Linux security headline.
Schneier's fame drives Counterpane's success
25th, March, 2005
Bruce Schneier, founder and chief technical officer of Counterpane
Internet Security, might be as close as the computer security industry
gets to its own celebrity. Although not as well known as Larry Ellison
at Oracle or Bill Gates at Microsoft, Schneier is still the public face
of his company, recognized by industry insiders as one of their gurus.
Businesses hire Counterpane to guard their networks from hackers and viruses
in the same way a nervous homeowner would pay a home-security provider
like ADT to watch for fires or burglars.
In this paper we describe our new CS2 block cipher which is
an extension of the original CS-Cipher. Our new design inherits the efficiency
of the original design while being upgraded to support a larger block
size as well as use a slightly improved substitution box. We prove that
our design is immune to differential and linear cryptanalysis as well
as argue it resists several other known attacks.
Network Security White Papers Written by Security Professionals
22nd, March, 2005
Its getting hard not to notice the number of large websites
advertising white papers. The catch is, most only contain a listing of
vendor sponsored marketing brochures. This isn't very helpful if you're
looking for detailed information about a technology.
Finding that Windows is superior to Linux is biased, Critics Say
25th, March, 2005
Two researchers surprised the audience at a computer-security
convention last month with their finding that a version of Microsoft Windows
was more secure than a competing Linux operating system. This week, the
researchers released their finished report, and it included another surprise:
Microsoft was funding the project all along.
Companies face greater risks if they run their Web sites on
Linux rather than Windows, a Microsoft-funded study has concluded. Last
year, Web servers based on Windows Server 2003 had fewer flaws to fix
than those based on Red Hat Enterprise Linux ES 3 in a standard open-source
configuration, researchers said in a paper released on Tuesday. Moreover,
the study indicated that the Microsoft-based Web server had far fewer
"days of risk"--a measure of the number of days that each vulnerability
is known, but unpatched--than the open-source rival.
The woman who cut me off on the freeway because she was too
busy talking on her cell phone might not have had a clue, but she probably
had an IP address. Mobile devices, from cell phones to PDAs to the automobiles
themselves, increasingly require always-on Internet connectivity. According
to at least one report, the average U.S. home has over 250 devices that
could benefit from Internet connectivity. While the number of IP addresses
in the world is large -- IPv4's 32-bit addressing scheme enables 4 billion
addresses -- it is not infinite. And the woman applying blue eyeshadow
on the 101 freeway is using up one of them.
One often-overlooked requirement of a functioning VPN is DNS.
For any host-network or network-network VPN, you will be enabling access
to machines that are not available on the Internet at large. Unless you
want to access machines only by their IP address, you want to have DNS
work cleanly.
There is a widespread and wholly inaccurate impression that
open source development is somehow haphazard and undisciplined, a free-for-all
among brilliant but uncoordinated individuals. In fact, most major open
source projects are very tightly managed highly disciplined teams.
If you're an IT manager, introducing Linux into your enterprise
is a tough decision. Choosing to take the plunge at all is one thing,
but facing the myriad choices is another. At last count, the database
at DistroWatch.com racked some 345 actively maintained Linux and BSD distributions.
Although most enterprises are likely to consider only a fraction of that
catalog, the number of decision points it represents is potentially much
larger.
The Linux Intrusion Detection System (LIDS) is a kernel patch
for both 2.4 and 2.6 kernels that adds Mandatory Access Control (MAC)
and other security enhancements to the Linux kernel. The main feature
of LIDS is its ability to limit the power of the root account. LIDS uses
Access Control Lists (ACLs) to control access to files, processes, and
network resources. Once these permissions are set, they cannot be overridden,
even if a user or process has root privileges. You may be wondering why
anyone would choose LIDS over its more popular counterpart, SELinux. Both
have their advantages. Both add MAC and the ability to limit the damage
that can be done by the root account. There are two reasons why you may
want to consider LIDS instead of SELinux.
Linux touted as the solution to online-banking problems
24th, March, 2005
Australian company Cybersource says it's currently talking to
two banks in Australia about providing Linux-based bootable CDs to consumers
to ensure Internet banking security. The company yesterday released information
about its Online Banking Coastguard solution. Coastguard is based upon
Knoppix, a Linux distribution which boots entirely from CD and is known
for its automatic hardware detection features. Cybersource has included
Mozilla Firefox as the sole browser for Internet banking.
Security vendor Symantec is warning that Apple's OS X operating
system is increasingly becoming a target for hackers and malware authors.
In its seventh bi-annual Internet Security Threat Report, Symantec said
over the past year, security researchers had discovered at least 37 serious
vulnerabilities in the Mac OS X system. According to Symantec, as Apple
increases its market share - with new low cost products such as the Mac
mini - its userbase is likely to come under increasing attack.
While many websites and papers discuss incident handling and
incident response plans, aside from RFC 2350 very few of these lay out
exactly what an actual plan might look like. The following is an outline
of a typical generalized incident handling and response plan for a small
to mid-sized organization that doesn't have a dedicated incident response
staff.
Enterprises are no longer restricted to the networked systems
bounded by the building in which the company is housed. Modern enterprises
span the globe and employees can easily access the corporate network from
outside the office, opening many more productivity channels. The proliferation
of broadband has enabled home working to become an economically viable
option while the dramatic fall in the price of laptops allied with the
explosion in WiFi technology has made mobile working the norm for many
companies.
Today's IT Solutions Need to Be "Open, Secure and Global," Says Novell's Messman
23rd, March, 2005
Opening its annual BrainShare user conference, Novell CEO Jack
Messman took the opportunity to remind the technology world that Novell
has "a truly global ecosystem, unmatched by other Linux vendors" - with
offices in 43 countries and over 5,000 technology, services and training
partners delivering support for its customers worldwide. "We give our
customers real choice," he added.
An "independent" report that claims Linux security vulnerabilities
are more numerous and severe than in Windows has been confirmed as having
been funded by Microsoft. The Role Comparison Report report by Richard
Ford of the Florida Institute of Technology's College of Engineering,
and Herbert Thompson of security company Security Innovation, was originally
previewed in draft form at the RSA conference in February, where it attracted
inevitable criticism for its methodology and claimed bias.
Laws against theft don't end stealing, and laws against the
ills of the Internet age aren't likely to stop the spread of computer
spyware, the Legislature's Judiciary Committee was told Friday. But such
laws are worth passing, said Alex Nicoll, associate director of technologies
for the Nebraska University Consortium on Information Assurance. The spyware
programs "are causing people grief. They are causing people loss. We should
not just say we should give up," Nicoll said at a committee hearing.
Brazilian police last week arrested the suspected kingpin of
a gang which looted an estimated $37m from online banking accounts. Valdir
Paulo de Almeida allegedly masterminded a scam to raid accounts using
a Trojan horse sent by email to thousands of victims, mostly Brazilian.