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<channel>
	<title>El rincón de Zerial &#187; dirhack</title>
	<atom:link href="http://blog.zerial.org/tag/dirhack/feed/" rel="self" type="application/rss+xml" />
	<link>http://blog.zerial.org</link>
	<description>Informática, GNU/Linux, Seguridad, Hacking, Programación, Ocio</description>
	<lastBuildDate>Wed, 08 Feb 2012 20:48:54 +0000</lastBuildDate>
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		<item>
		<title>dirHack</title>
		<link>http://blog.zerial.org/seguridad/dirhack/</link>
		<comments>http://blog.zerial.org/seguridad/dirhack/#comments</comments>
		<pubDate>Sun, 05 Oct 2008 01:05:08 +0000</pubDate>
		<dc:creator>Zerial</dc:creator>
				<category><![CDATA[Hacking]]></category>
		<category><![CDATA[Programación]]></category>
		<category><![CDATA[Seguridad]]></category>
		<category><![CDATA[dirhack]]></category>
		<category><![CDATA[GNU/Linux]]></category>

		<guid isPermaLink="false">http://blog.zerial.org/2008/10/04/dirhack/</guid>
		<description><![CDATA[El siguiente script sirve para hacer auditorias de seguridad en cuanto a los permisos en la estructura de directorios de nuestros servidores. #!/bin/sh # Written by Zerial &#38;amp; Pons # McDonald&#8216;s Day &#8230; # 21.34, Jun 13 2006 &#8211; Updated: 01.41, Jun 15 2006 # # # # # # # # # # # [...]]]></description>
			<content:encoded><![CDATA[<p>El siguiente script sirve para hacer auditorias de seguridad en cuanto a los permisos en la estructura de directorios de nuestros servidores.</p>
<blockquote>
<div class="dean_ch" style="white-space: wrap;">
<ol>
<li class="li1">
<div class="de1"><span class="re3">#!/bin/sh</span></div>
</li>
<li class="li1">
<div class="de1"><span class="re3"># Written by Zerial &amp;amp; Pons</span></div>
</li>
<li class="li1">
<div class="de1"><span class="re3"># McDonald</span><span class="st0">&#8216;s Day &#8230;</span></div>
</li>
<li class="li1">
<div class="de1"><span class="st0"># 21.34, Jun 13 2006 &#8211; Updated: 01.41, Jun 15 2006</span></div>
</li>
<li class="li2">
<div class="de2"><span class="st0"># # # # # # # # # # # # # # # # # # # # # # # # # #</span></div>
</li>
<li class="li1">
<div class="de1"><span class="st0"># &nbsp;____ &nbsp;_ &nbsp; &nbsp; &nbsp;_ &nbsp; _ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;_</span></div>
</li>
<li class="li1">
<div class="de1"><span class="st0"># | &nbsp;_ (_)_ __| | | | __ _ &nbsp;___| | __</span></div>
</li>
<li class="li1">
<div class="de1"><span class="st0"># | | | | | &#8216;</span>__| |_| |/ _` |/ __| |/ /</div>
</li>
<li class="li1">
<div class="de1"><span class="re3"># | |_| | | | &nbsp;| &nbsp;_ &nbsp;| <span class="br0">&#40;</span>_| | <span class="br0">&#40;</span>__| &nbsp; &lt; # |____/|_|_| &nbsp;|_| |_|__,_|___|_|_</span></div>
</li>
<li class="li2">
<div class="de2"><span class="re3">#</span></div>
</li>
<li class="li1">
<div class="de1"><span class="re3"># # # # # # # # # # # # # # # # # # # # # # # # # #</span></div>
</li>
<li class="li1">
<div class="de1"><span class="re2">version=</span><span class="st0">&quot;1.0.2&quot;</span></div>
</li>
<li class="li1">
<div class="de1"><span class="kw1">if</span> <span class="br0">&#91;</span> <span class="re4">$#</span> -lt <span class="nu0">2</span> <span class="br0">&#93;</span></div>
</li>
<li class="li1">
<div class="de1"><span class="kw1">then</span></div>
</li>
<li class="li2">
<div class="de2">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;DirHack eXploit $version&quot;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;This thing will list all sub-home directories&quot;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;that are accesable by the user running the&quot;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;script.&quot;</span></div>
</li>
<li class="li2">
<div class="de2">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> -e <span class="st0">&quot;tusage: $0 id output-file bz2|gz|text (default is text)&quot;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> -e <span class="st0">&quot;texample: $0 999 out bz2&quot;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">break</span></div>
</li>
<li class="li1">
<div class="de1"><span class="kw1">else</span></div>
</li>
<li class="li2">
<div class="de2">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> &gt; $<span class="nu0">2</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">if</span> <span class="br0">&#91;</span> ! -<span class="kw2">w</span> $<span class="nu0">2</span> <span class="br0">&#93;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">then</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;File $2 doesn&#8217;t have write permissions&quot;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">break</span></div>
</li>
<li class="li2">
<div class="de2">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">fi</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp;</div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; <span class="re2">freedirs=</span><span class="st0">&quot;public_html public_ftp etc tmp mail&quot;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;Starting DirHack $version&quot;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;DirHack eXploit $version&quot;</span> &gt;&gt; $<span class="nu0">2</span></div>
</li>
<li class="li2">
<div class="de2">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">for</span> <span class="kw2">dir</span> <span class="kw1">in</span> <span class="re1">$freedirs</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">do</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">for</span> user <span class="kw1">in</span> `<span class="kw2">awk</span> -F<span class="st0">&#8216;:&#8217;</span> <span class="st0">&#8216; {printf $1 &quot;n&quot;} &#8216;</span> /etc/<span class="kw2">passwd</span>`</div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">do</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="re2">userhome=</span>`<span class="kw2">cat</span> /etc/<span class="kw2">passwd</span> |grep <span class="re1">$user</span>: |grep :$<span class="br0">&#40;</span><span class="kw2">id</span> -u <span class="re1">$user</span><span class="br0">&#41;</span>: |awk -F<span class="st0">&#8216;:&#8217;</span> <span class="st0">&#8216; {printf $6 &quot;n&quot;}&#8217;</span>`</div>
</li>
<li class="li2">
<div class="de2">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="re2">fulldir=</span><span class="re1">$userhome</span>/<span class="re1">$dir</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">if</span> <span class="br0">&#91;</span> `<span class="kw2">id</span> -u <span class="re1">$user</span>` -gt $<span class="nu0">1</span> <span class="br0">&#93;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">then</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">if</span> <span class="br0">&#91;</span> -d <span class="re1">$fulldir</span> <span class="br0">&#93;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">then</span></div>
</li>
<li class="li2">
<div class="de2">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;&quot;</span> &gt;&gt; $<span class="nu0">2</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&quot;</span> &gt;&gt; $<span class="nu0">2</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;User: $user&quot;</span> &gt;&gt; $<span class="nu0">2</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;Directory: $fulldir&quot;</span> &gt;&gt; $<span class="nu0">2</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;Size: `du -sh $fulldir`&quot;</span> &gt;&gt; $<span class="nu0">2</span></div>
</li>
<li class="li2">
<div class="de2">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;&quot;</span> &gt;&gt; $<span class="nu0">2</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw2">ls</span> -Rla <span class="re1">$fulldir</span> &gt;&gt; $<span class="nu0">2</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">fi</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">fi</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">done</span></div>
</li>
<li class="li2">
<div class="de2">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">done</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">case</span> $<span class="nu0">3</span> <span class="kw1">in</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bz2<span class="br0">&#41;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="re2">bzip2=</span>`<span class="kw2">which</span> <span class="kw2">bzip2</span>`</div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">if</span> <span class="br0">&#91;</span> -x <span class="re1">$bzip</span> <span class="br0">&#93;</span></div>
</li>
<li class="li2">
<div class="de2">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">then</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="re1">$bzip2</span> -f $<span class="nu0">2</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;File ready and compressed in $2.bz2&quot;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">else</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;No exec permissions for bzip2 or bzip2 not found.&quot;</span></div>
</li>
<li class="li2">
<div class="de2">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;File left uncompressed in $2&quot;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">fi</span>;;</div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; gz<span class="br0">&#41;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="re2">gzip=</span>`<span class="kw2">which</span> <span class="kw2">gzip</span>`</div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">if</span> <span class="br0">&#91;</span> -x <span class="re1">$gzip</span> <span class="br0">&#93;</span></div>
</li>
<li class="li2">
<div class="de2">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">then</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="re1">$gzip</span> -f $<span class="nu0">2</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;File ready and compressed in $2.gz&quot;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">else</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;No exec permissions for gzip or gzip not found.&quot;</span></div>
</li>
<li class="li2">
<div class="de2">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;File left uncompressed in $2&quot;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">fi</span>;;</div>
</li>
<li class="li1">
<div class="de1">&nbsp;</div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; *<span class="br0">&#41;</span></div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw3">echo</span> <span class="st0">&quot;File ready in $2&quot;</span>;;</div>
</li>
<li class="li2">
<div class="de2">&nbsp;</div>
</li>
<li class="li1">
<div class="de1">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">esac</span></div>
</li>
</ol>
</div>
</blockquote>
<p><strong>Funcionamiento:</strong> Lee todos los usuarios desde /etc/passwd y luego, por cada usuario obtenido, ingresa al directorio <em>public_html</em> y lista, recursivamente, todos los directorios y subdirectorios. Generalmente, el usuario en el que corre apache se llama <em>apache</em> y obviamente, debe tener acceso de lectura a todos los directorios y ficheros que se desean mostrar, por ejemplo /home/user/public_html/index.php.</p>
<p>Si no tiene permisos de lectura para apache dificilmente se podria ingresar via web. Muchas veces, estos ficheros tienen permisos de escritura y de lectura y es cuando hay que actuar. Si no encontramos ficheros con permisos de escritura no importa, al menos tenemos acceso para leerlos. Por ejemplo, en los CMS mas populares como WordPress, Joomla, etc. suelen tener un fichero de configuracion con el usuario y clave, en texto plato, de la base de datos con lo que podemos generar un script que nos permita ingresar y/o apoderarnos de esa base de datos.<br />
Este script nos creara un listado, en txt (opcionalmente comprimido en gz o bz), con todos los ficheros y sus permisos, para que podamos indagar en la estructura de directorios.<br />
Una forma de solucionar este problema es con <em>chroot</em>.</p>
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