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	<title>Comments on: Linux viruses</title>
	<atom:link href="http://www.kryogenix.org/days/2004/12/06/viruses/feed" rel="self" type="application/rss+xml" />
	<link>http://www.kryogenix.org/days/2004/12/06/viruses</link>
	<description>scratched tallies on the prison wall</description>
	<pubDate>Thu, 08 Jan 2009 03:00:42 +0000</pubDate>
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		<title>By: Ian Bicking</title>
		<link>http://www.kryogenix.org/days/2004/12/06/viruses/comment-page-1#comment-1003</link>
		<dc:creator>Ian Bicking</dc:creator>
		<pubDate>Thu, 01 Jan 1970 01:00:00 +0000</pubDate>
		<guid isPermaLink="false">http://www.kryogenix.org/adpb/2004/12/06/viruses/#comment-1003</guid>
		<description>&lt;p&gt;When?  I don&#8217;t buy it.  We don&#8217;t have Outlook Express on Linux.  We don&#8217;t have programs that execute anything from incoming emails.&lt;/p&gt;

	&lt;p&gt;Maybe there could be a couple.  Say, a buffer overflow bug in OOo, so that people could get infected if they open a seemingly innocuous document.  There&#8217;s a few other instances.  But why update the virus definition when you could just update the application?  On Linux the applications are being updated as soon as holes are found, long before there&#8217;s any exploits to search for.  Once there&#8217;s an exploit to search for it&#8217;s too late, it means someone has been infected.&lt;/p&gt;

	&lt;p&gt;Sure, not everyone updates their applications.  Let&#8217;s work on that instead.&lt;/p&gt;</description>
		<content:encoded><![CDATA[<p>When?  I don&#8217;t buy it.  We don&#8217;t have Outlook Express on Linux.  We don&#8217;t have programs that execute anything from incoming emails.</p>
<p>Maybe there could be a couple.  Say, a buffer overflow bug in OOo, so that people could get infected if they open a seemingly innocuous document.  There&#8217;s a few other instances.  But why update the virus definition when you could just update the application?  On Linux the applications are being updated as soon as holes are found, long before there&#8217;s any exploits to search for.  Once there&#8217;s an exploit to search for it&#8217;s too late, it means someone has been infected.</p>
<p>Sure, not everyone updates their applications.  Let&#8217;s work on that instead.</p>
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		<title>By: mrben</title>
		<link>http://www.kryogenix.org/days/2004/12/06/viruses/comment-page-1#comment-1004</link>
		<dc:creator>mrben</dc:creator>
		<pubDate>Thu, 01 Jan 1970 01:00:00 +0000</pubDate>
		<guid isPermaLink="false">http://www.kryogenix.org/adpb/2004/12/06/viruses/#comment-1004</guid>
		<description>&lt;p&gt;I think that the initial problem is unlikely to be viruses, but rather exploits and open services. We need to ensure that new Linux users are either forced to or learn to ensure that unnecessary services are shut down, and that software is regularly updated.&lt;/p&gt;

	&lt;p&gt;However, I&#8217;m glad to see ClamAV getting some press, as I do think it is vital to be able to say to people &#8220;No, there aren&#8217;t any Linux viruses, but Yes, we can provide you with free virus protection&#8221; &lt;/p&gt;</description>
		<content:encoded><![CDATA[<p>I think that the initial problem is unlikely to be viruses, but rather exploits and open services. We need to ensure that new Linux users are either forced to or learn to ensure that unnecessary services are shut down, and that software is regularly updated.</p>
<p>However, I&#8217;m glad to see ClamAV getting some press, as I do think it is vital to be able to say to people &#8220;No, there aren&#8217;t any Linux viruses, but Yes, we can provide you with free virus protection&#8221; </p>
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		<title>By: sil</title>
		<link>http://www.kryogenix.org/days/2004/12/06/viruses/comment-page-1#comment-1005</link>
		<dc:creator>sil</dc:creator>
		<pubDate>Thu, 01 Jan 1970 01:00:00 +0000</pubDate>
		<guid isPermaLink="false">http://www.kryogenix.org/adpb/2004/12/06/viruses/#comment-1005</guid>
		<description>&lt;p&gt;Ian: not so. We don&#8217;t have programs that &lt;em&gt;intentionally&lt;/em&gt; execute viruses from incoming emails, but then neither has Microsoft for quite a while. They do have buffer overflows in the &lt;span class="caps"&gt;MIME&lt;/span&gt; parser for mails, and buffer overflows in the &lt;span class="caps"&gt;JPEG&lt;/span&gt; displayer, and formatstring errors in the &lt;span class="caps"&gt;MIME&lt;/span&gt; parser, and so on: Linux is not invulnerable to these errors.&lt;/p&gt;

	&lt;p&gt;Updating the application is not the best solution, especially for something as big and complex as OOo. If they come up with a patch, it goes into &lt;span class="caps"&gt;CVS&lt;/span&gt;, but there&#8217;s no immediate release: the Debian security team, say, will backport that patch to their current version of OOo, but in a large environment you&#8217;ll have to download that patched version and test it to make sure that the patch hasn&#8217;t broken any of your other applications or things that rely on OOo&#8230;and all the time you&#8217;re doing that, your users might be downloading viral documents. I&#8217;m generally in agreement that people need to update their applications more, but a virus checker can be set to download and test for new viral definitions &lt;em&gt;automatically&lt;/em&gt;&#8212;applications cannot. Well, they can, but who do you know who runs &lt;code&gt;apt-get update&lt;/code&gt; out of a cron job? Not many people, i bet.&lt;/p&gt;</description>
		<content:encoded><![CDATA[<p>Ian: not so. We don&#8217;t have programs that <em>intentionally</em> execute viruses from incoming emails, but then neither has Microsoft for quite a while. They do have buffer overflows in the <span class="caps">MIME</span> parser for mails, and buffer overflows in the <span class="caps">JPEG</span> displayer, and formatstring errors in the <span class="caps">MIME</span> parser, and so on: Linux is not invulnerable to these errors.</p>
<p>Updating the application is not the best solution, especially for something as big and complex as OOo. If they come up with a patch, it goes into <span class="caps">CVS</span>, but there&#8217;s no immediate release: the Debian security team, say, will backport that patch to their current version of OOo, but in a large environment you&#8217;ll have to download that patched version and test it to make sure that the patch hasn&#8217;t broken any of your other applications or things that rely on OOo&#8230;and all the time you&#8217;re doing that, your users might be downloading viral documents. I&#8217;m generally in agreement that people need to update their applications more, but a virus checker can be set to download and test for new viral definitions <em>automatically</em>&#8212;applications cannot. Well, they can, but who do you know who runs <code>apt-get update</code> out of a cron job? Not many people, i bet.</p>
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		<title>By: Adrian</title>
		<link>http://www.kryogenix.org/days/2004/12/06/viruses/comment-page-1#comment-1006</link>
		<dc:creator>Adrian</dc:creator>
		<pubDate>Thu, 01 Jan 1970 01:00:00 +0000</pubDate>
		<guid isPermaLink="false">http://www.kryogenix.org/adpb/2004/12/06/viruses/#comment-1006</guid>
		<description>&lt;p&gt;Even though there is no OE on linux there is still the potential for emails to socially engineer the user to open malicious attachments, correct?&lt;/p&gt;

	&lt;p&gt;The lack of a virus checker is a real problem to me &#8211; sure users don&#8217;t run as root, but it still doesnt stop a virus from taking out the home directory &#8211; which contains items far more valuable to me than the underlying OS.&lt;/p&gt;</description>
		<content:encoded><![CDATA[<p>Even though there is no OE on linux there is still the potential for emails to socially engineer the user to open malicious attachments, correct?</p>
<p>The lack of a virus checker is a real problem to me &#8211; sure users don&#8217;t run as root, but it still doesnt stop a virus from taking out the home directory &#8211; which contains items far more valuable to me than the underlying OS.</p>
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		<title>By: sil</title>
		<link>http://www.kryogenix.org/days/2004/12/06/viruses/comment-page-1#comment-1007</link>
		<dc:creator>sil</dc:creator>
		<pubDate>Thu, 01 Jan 1970 01:00:00 +0000</pubDate>
		<guid isPermaLink="false">http://www.kryogenix.org/adpb/2004/12/06/viruses/#comment-1007</guid>
		<description>&lt;p&gt;Adrian: I entirely agree. Generally, Linux mail cients don&#8217;t allow stuff to be run directly from an email, but then neither do Windows ones any more. I also agree on the home directory thing: the essay I linked to from the post goes into this ina  bit more detail.&lt;/p&gt;</description>
		<content:encoded><![CDATA[<p>Adrian: I entirely agree. Generally, Linux mail cients don&#8217;t allow stuff to be run directly from an email, but then neither do Windows ones any more. I also agree on the home directory thing: the essay I linked to from the post goes into this ina  bit more detail.</p>
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		<title>By: mrben</title>
		<link>http://www.kryogenix.org/days/2004/12/06/viruses/comment-page-1#comment-1008</link>
		<dc:creator>mrben</dc:creator>
		<pubDate>Thu, 01 Jan 1970 01:00:00 +0000</pubDate>
		<guid isPermaLink="false">http://www.kryogenix.org/adpb/2004/12/06/viruses/#comment-1008</guid>
		<description>&lt;p&gt;New article over at Newsforge on this very topic &#8211; see http://www.newsforge.com/article.pl?sid=04/12/01/2329229&lt;/p&gt;

	&lt;p&gt;Oh, and I &lt;em&gt;do&lt;/em&gt; run apt-get update in a cronjob via cron-apt; I also apt-get upgrade on a daily basis (cron-apt downloads the packages, and then I install manually later in the day)&lt;/p&gt;</description>
		<content:encoded><![CDATA[<p>New article over at Newsforge on this very topic &#8211; see <a href="http://www.newsforge.com/article.pl?sid=04/12/01/2329229" rel="nofollow">http://www.newsforge.com/article.pl?sid=04/12/01/2329229</a></p>
<p>Oh, and I <em>do</em> run apt-get update in a cronjob via cron-apt; I also apt-get upgrade on a daily basis (cron-apt downloads the packages, and then I install manually later in the day)</p>
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		<title>By: sil</title>
		<link>http://www.kryogenix.org/days/2004/12/06/viruses/comment-page-1#comment-1009</link>
		<dc:creator>sil</dc:creator>
		<pubDate>Thu, 01 Jan 1970 01:00:00 +0000</pubDate>
		<guid isPermaLink="false">http://www.kryogenix.org/adpb/2004/12/06/viruses/#comment-1009</guid>
		<description>&lt;p&gt;mrben: you are, if anything, proving my point about apt. Why don&#8217;t you upgrade in the same cron job, rather than doing it manually later? Because you don&#8217;t trust it to not run amok one day and automatedly destroy your system, right? That&#8217;s why we can&#8217;t have automated upgrades for applications, as discussed above.&lt;/p&gt;</description>
		<content:encoded><![CDATA[<p>mrben: you are, if anything, proving my point about apt. Why don&#8217;t you upgrade in the same cron job, rather than doing it manually later? Because you don&#8217;t trust it to not run amok one day and automatedly destroy your system, right? That&#8217;s why we can&#8217;t have automated upgrades for applications, as discussed above.</p>
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		<title>By: mrben</title>
		<link>http://www.kryogenix.org/days/2004/12/06/viruses/comment-page-1#comment-1010</link>
		<dc:creator>mrben</dc:creator>
		<pubDate>Thu, 01 Jan 1970 01:00:00 +0000</pubDate>
		<guid isPermaLink="false">http://www.kryogenix.org/adpb/2004/12/06/viruses/#comment-1010</guid>
		<description>&lt;p&gt;Actually, it&#8217;s because I&#8217;m not sure what would happen when apt-get starts asking questions&#8230;....&lt;/p&gt;

	&lt;p&gt;If I can work out how to get it to install the stuff which doesn&#8217;t ask questions, and then ask me the questions later, then I might.&lt;/p&gt;

	&lt;p&gt;Generally, I&#8217;ve only had problems with a couple of packages in Debian, and these have always resolved themselves within a couple of days.&lt;/p&gt;</description>
		<content:encoded><![CDATA[<p>Actually, it&#8217;s because I&#8217;m not sure what would happen when apt-get starts asking questions&#8230;&#8230;.</p>
<p>If I can work out how to get it to install the stuff which doesn&#8217;t ask questions, and then ask me the questions later, then I might.</p>
<p>Generally, I&#8217;ve only had problems with a couple of packages in Debian, and these have always resolved themselves within a couple of days.</p>
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		<title>By: sil</title>
		<link>http://www.kryogenix.org/days/2004/12/06/viruses/comment-page-1#comment-1011</link>
		<dc:creator>sil</dc:creator>
		<pubDate>Thu, 01 Jan 1970 01:00:00 +0000</pubDate>
		<guid isPermaLink="false">http://www.kryogenix.org/adpb/2004/12/06/viruses/#comment-1011</guid>
		<description>&lt;p&gt;mrben: You are &lt;em&gt;supposed&lt;/em&gt; to be able to do this by setting your debconf questions level to &#8220;critical&#8221;: you will only be asked questions that are above your setting, so you won&#8217;t be asking questions. The problem with doing this is that some packages (not many, but some) still don&#8217;t use debconf for configuration. I also don&#8217;t know how the &#8220;this file has been changed; do you want to keep your version or install the pacakge maintainer&#8217;s version&#8221; question works in a non-interactive install. Take a look at the &lt;a href="http://www.informatik.uni-koeln.de/fai/"&gt;&lt;span class="caps"&gt;FAI&lt;/span&gt;&lt;/a&gt; guys; they&#8217;ve thought about stuff like this.&lt;/p&gt;</description>
		<content:encoded><![CDATA[<p>mrben: You are <em>supposed</em> to be able to do this by setting your debconf questions level to &#8220;critical&#8221;: you will only be asked questions that are above your setting, so you won&#8217;t be asking questions. The problem with doing this is that some packages (not many, but some) still don&#8217;t use debconf for configuration. I also don&#8217;t know how the &#8220;this file has been changed; do you want to keep your version or install the pacakge maintainer&#8217;s version&#8221; question works in a non-interactive install. Take a look at the <a href="http://www.informatik.uni-koeln.de/fai/"><span class="caps">FAI</span></a> guys; they&#8217;ve thought about stuff like this.</p>
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		<title>By: Ade</title>
		<link>http://www.kryogenix.org/days/2004/12/06/viruses/comment-page-1#comment-1012</link>
		<dc:creator>Ade</dc:creator>
		<pubDate>Thu, 01 Jan 1970 01:00:00 +0000</pubDate>
		<guid isPermaLink="false">http://www.kryogenix.org/adpb/2004/12/06/viruses/#comment-1012</guid>
		<description>&lt;p&gt;Nice to see that we are at least thinking about this now. It really worries me that we might end up with egg on our faces.&lt;/p&gt;

	&lt;p&gt;I agree with the post about email clients being more secure now, and as Aq says, they are in windows now but &#8211;&lt;br /&gt;
&#8220;theres no patch for stupid users&#8221;&lt;/p&gt;

	&lt;p&gt;Its a bit of a harsh quote but not to far from the point.&lt;/p&gt;

	&lt;p&gt;Built in AV would be cool (even if there is liitle to look for at the moment). As more people start using Linux desktops, so the number of &#8220;less technical&#8221; users increase &#8211; and therefore so does the risk.&lt;/p&gt;

	&lt;p&gt;Also it would be nice to see something along the lines of Microsofts &lt;span class="caps"&gt;SUS&lt;/span&gt;, that can centrally manage patches &#8211; and yes I do realise you can do this with a script but I mean something with a nice &lt;span class="caps"&gt;GUI&lt;/span&gt;&lt;/p&gt;</description>
		<content:encoded><![CDATA[<p>Nice to see that we are at least thinking about this now. It really worries me that we might end up with egg on our faces.</p>
<p>I agree with the post about email clients being more secure now, and as Aq says, they are in windows now but &#8211;<br />
&#8220;theres no patch for stupid users&#8221;</p>
<p>Its a bit of a harsh quote but not to far from the point.</p>
<p>Built in AV would be cool (even if there is liitle to look for at the moment). As more people start using Linux desktops, so the number of &#8220;less technical&#8221; users increase &#8211; and therefore so does the risk.</p>
<p>Also it would be nice to see something along the lines of Microsofts <span class="caps">SUS</span>, that can centrally manage patches &#8211; and yes I do realise you can do this with a script but I mean something with a nice <span class="caps">GUI</span></p>
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