{"id":2122,"date":"2015-01-29T12:00:10","date_gmt":"2015-01-29T05:00:10","guid":{"rendered":"https:\/\/engineerball.com\/?p=2122"},"modified":"2015-01-29T12:14:10","modified_gmt":"2015-01-29T05:14:10","slug":"how-to-fix-ghost-bugs-on-linux","status":"publish","type":"post","link":"https:\/\/engineerball.com\/blog\/2015\/01\/29\/how-to-fix-ghost-bugs-on-linux.html","title":{"rendered":"\u0e41\u0e01\u0e49\u0e44\u0e02 GHOST \u0e1a\u0e31\u0e4a\u0e01\u0e23\u0e49\u0e32\u0e22\u0e41\u0e23\u0e07\u0e1a\u0e19\u0e23\u0e30\u0e1a\u0e1a\u0e25\u0e34\u0e19\u0e38\u0e01\u0e0b\u0e4c"},"content":{"rendered":"<p>\u0e21\u0e35\u0e23\u0e32\u0e22\u0e07\u0e32\u0e19\u0e27\u0e48\u0e32 \u0e1e\u0e1a\u0e1a\u0e31\u0e4a\u0e01\u0e23\u0e49\u0e32\u0e22\u0e41\u0e23\u0e07\u0e43\u0e19\u0e44\u0e25\u0e1a\u0e23\u0e32\u0e23\u0e35 glibc \u0e42\u0e14\u0e22\u0e1a\u0e23\u0e34\u0e29\u0e31\u0e17 Qualys \u0e1c\u0e39\u0e49\u0e04\u0e49\u0e19\u0e1e\u0e1a\u0e43\u0e2b\u0e49\u0e0a\u0e37\u0e48\u0e2d\u0e0a\u0e48\u0e2d\u0e07\u0e42\u0e2b\u0e27\u0e48\u0e19\u0e35\u0e49\u0e27\u0e48\u0e32 <a href=\"http:\/\/www.openwall.com\/lists\/oss-security\/2015\/01\/27\/9\">GHOST<\/a> \u0e01\u0e23\u0e30\u0e17\u0e1a\u0e25\u0e34\u0e19\u0e38\u0e01\u0e0b\u0e4c<\/p>\n<ul>\n<li>RHEL (Red Hat Enterprise Linux) version 5.x, 6.x and 7.x<\/li>\n<li>CentOS Linux version 5.x, 6.x &amp; 7.x<\/li>\n<li>Ubuntu Linux version 10.04, 12.04 LTS<\/li>\n<li>Debian Linux version 7.x<\/li>\n<li>Linux Mint version 13.0<\/li>\n<li>Fedora Linux version 19 or older<\/li>\n<li>SUSE Linux Enterprise 11 and older (also OpenSuse Linux 11 or older versions).<\/li>\n<li>Arch Linux glibc version &lt;= 2.18-1<\/li>\n<\/ul>\n<p>\u0e0b\u0e36\u0e48\u0e07\u0e1c\u0e39\u0e49\u0e42\u0e08\u0e21\u0e15\u0e35\u0e2d\u0e32\u0e08\u0e43\u0e0a\u0e49\u0e0a\u0e48\u0e2d\u0e07\u0e42\u0e2b\u0e27\u0e48\u0e19\u0e35\u0e49\u0e43\u0e19\u0e01\u0e32\u0e23\u0e42\u0e08\u0e21\u0e15\u0e35\u0e1c\u0e48\u0e32\u0e19\u0e17\u0e32\u0e07\u0e1f\u0e31\u0e07\u0e01\u0e4c\u0e0a\u0e31\u0e48\u0e19 gethostbyname \u0e41\u0e25\u0e30 gethostbyname2 \u0e02\u0e2d\u0e07 glibc<\/p>\n<p>\u0e0b\u0e36\u0e48\u0e07\u0e1f\u0e31\u0e07\u0e01\u0e4c\u0e0a\u0e31\u0e48\u0e19 gethostbyname \u0e40\u0e1b\u0e47\u0e19\u0e1f\u0e31\u0e07\u0e01\u0e4c\u0e0a\u0e31\u0e48\u0e19\u0e17\u0e35\u0e48\u0e43\u0e0a\u0e49\u0e43\u0e19\u0e01\u0e32\u0e23\u0e41\u0e1b\u0e25\u0e07\u0e0a\u0e37\u0e48\u0e2d hostname \u0e43\u0e2b\u0e49\u0e01\u0e25\u0e32\u0e22\u0e40\u0e1b\u0e47\u0e19 IP Address \u0e2a\u0e48\u0e27\u0e19\u0e43\u0e2b\u0e0d\u0e48\u0e41\u0e2d\u0e1e\u0e1e\u0e25\u0e34\u0e40\u0e04\u0e0a\u0e31\u0e48\u0e19\u0e17\u0e35\u0e48\u0e43\u0e0a\u0e49\u0e01\u0e32\u0e23 initial network \u0e08\u0e30\u0e43\u0e0a\u0e49\u0e1f\u0e31\u0e07\u0e01\u0e4c\u0e0a\u0e31\u0e48\u0e19\u0e19\u0e35\u0e49\u0e40\u0e0a\u0e48\u0e19 sshd, exim \u0e40\u0e1b\u0e47\u0e19\u0e15\u0e49\u0e19<\/p>\n<p>\u0e42\u0e14\u0e22\u0e15\u0e31\u0e27\u0e2d\u0e22\u0e48\u0e32\u0e07\u0e01\u0e32\u0e23\u0e42\u0e08\u0e21\u0e15\u0e35 \u0e40\u0e0a\u0e48\u0e19 \u0e43\u0e2a\u0e48\u0e0a\u0e37\u0e48\u0e2d hostname \u0e40\u0e02\u0e49\u0e32\u0e44\u0e1b\u0e22\u0e32\u0e27\u0e46 \u0e41\u0e25\u0e30\u0e21\u0e35 &#8220;.&#8221; 3 \u0e08\u0e38\u0e14\u0e02\u0e49\u0e32\u0e07\u0e43\u0e19\u0e40\u0e0a\u0e48\u0e19<\/p>\n<p>12123132131.32423123234.12133123123.32412312313<\/p>\n<p>\u0e1f\u0e31\u0e07\u0e01\u0e4c\u0e0a\u0e31\u0e48\u0e19\u0e01\u0e47\u0e08\u0e30\u0e44\u0e1b\u0e17\u0e33\u0e01\u0e32\u0e23\u0e40\u0e0a\u0e47\u0e04 A record \u0e41\u0e1a\u0e1a recursive \u0e40\u0e1e\u0e37\u0e48\u0e2d\u0e43\u0e2b\u0e49\u0e44\u0e14\u0e49 IP \u0e2d\u0e2d\u0e01\u0e21\u0e32 \u0e0b\u0e36\u0e48\u0e07\u0e1a\u0e23\u0e34\u0e29\u0e31\u0e17 Quaylys \u0e1c\u0e39\u0e49\u0e1e\u0e1a\u0e1b\u0e31\u0e0d\u0e2b\u0e32\u0e19\u0e35\u0e49\u0e44\u0e14\u0e49\u0e17\u0e33\u0e01\u0e32\u0e23\u0e43\u0e0a\u0e49\u0e0a\u0e48\u0e2d\u0e07\u0e42\u0e2b\u0e27\u0e48\u0e19\u0e35\u0e49\u0e1c\u0e48\u0e32\u0e19\u0e17\u0e32\u0e07\u0e42\u0e1b\u0e23\u0e41\u0e01\u0e23\u0e21 Exim (mail) \u0e08\u0e19\u0e2a\u0e32\u0e21\u0e32\u0e23\u0e16\u0e23\u0e31\u0e19\u0e04\u0e33\u0e2a\u0e31\u0e48\u0e07\u0e20\u0e32\u0e22\u0e43\u0e15\u0e49 daemon \u0e17\u0e35\u0e48\u0e23\u0e31\u0e19\u0e42\u0e1b\u0e23\u0e41\u0e01\u0e23\u0e21 Exim \u0e44\u0e14\u0e49<\/p>\n<p><strong>\u0e01\u0e32\u0e23\u0e40\u0e0a\u0e47\u0e04\u0e40\u0e1a\u0e37\u0e49\u0e2d\u0e07\u0e15\u0e49\u0e19\u0e27\u0e48\u0e32\u0e21\u0e35\u0e04\u0e27\u0e32\u0e21\u0e40\u0e2a\u0e35\u0e48\u0e22\u0e07\u0e2b\u0e23\u0e37\u0e2d\u0e44\u0e21\u0e48<\/strong><br \/>\n\u0e2a\u0e32\u0e21\u0e32\u0e23\u0e16\u0e04\u0e2d\u0e21\u0e44\u0e1e\u0e25\u0e4c\u0e41\u0e25\u0e30\u0e23\u0e31\u0e19\u0e42\u0e04\u0e49\u0e14\u0e19\u0e35\u0e49\u0e44\u0e14\u0e49\u0e40\u0e25\u0e22\u0e04\u0e23\u0e31\u0e1a<\/p>\n<p>[c]<br \/>\n\/* ghosttest.c: GHOST vulnerability tester *\/<br \/>\n\/* Credit: <a href=\"http:\/\/www.openwall.com\/lists\/oss-security\/2015\/01\/27\/9\">http:\/\/www.openwall.com\/lists\/oss-security\/2015\/01\/27\/9<\/a> *\/<br \/>\n#include &lt;netdb.h&gt;<br \/>\n#include &lt;stdio.h&gt;<br \/>\n#include &lt;stdlib.h&gt;<br \/>\n#include &lt;string.h&gt;<br \/>\n#include &lt;errno.h&gt;<\/p>\n<p>#define CANARY &quot;in_the_coal_mine&quot;<\/p>\n<p>struct {<br \/>\n\u00a0 char buffer[1024];<br \/>\n\u00a0 char canary[sizeof(CANARY)];<br \/>\n} temp = { &quot;buffer&quot;, CANARY };<\/p>\n<p>int main(void) {<br \/>\n\u00a0 struct hostent resbuf;<br \/>\n\u00a0 struct hostent *result;<br \/>\n\u00a0 int herrno;<br \/>\n\u00a0 int retval;<\/p>\n<p>\u00a0 \/*** strlen (name) = size_needed &#8211; sizeof (*host_addr) &#8211; \u00a0 \u00a0 sizeof (*h_addr_ptrs) &#8211; 1; ***\/<br \/>\n\u00a0 size_t len = sizeof(temp.buffer) &#8211; 16*sizeof(unsigned char) &#8211; 2*sizeof(char *) &#8211; 1;<br \/>\n\u00a0 char name[sizeof(temp.buffer)];<br \/>\n\u00a0 memset(name, &#8216;0&#8217;, len);<br \/>\n\u00a0 name[len] = &#8216;&#92;&#48;&#8217;;<\/p>\n<p>\u00a0 retval = gethostbyname_r(name, &amp;resbuf, temp.buffer, sizeof(temp.buffer), &amp;result, &amp;herrno);<\/p>\n<p>\u00a0 if (strcmp(temp.canary, CANARY) != 0) {<br \/>\n\u00a0 \u00a0 puts(&quot;vulnerable&quot;);<br \/>\n\u00a0 \u00a0 exit(EXIT_SUCCESS);<br \/>\n\u00a0 }<br \/>\n\u00a0 if (retval == ERANGE) {<br \/>\n\u00a0 \u00a0 puts(&quot;not vulnerable&quot;);<br \/>\n\u00a0 \u00a0 exit(EXIT_SUCCESS);<br \/>\n\u00a0 }<br \/>\n\u00a0 puts(&quot;should not happen&quot;);<br \/>\n\u00a0 exit(EXIT_FAILURE);<br \/>\n}<\/p>\n<p>[\/c]<\/p>\n<p>\u0e08\u0e32\u0e01\u0e19\u0e31\u0e49\u0e19\u0e04\u0e2d\u0e21\u0e44\u0e1e\u0e25\u0e4c\u0e41\u0e25\u0e30\u0e23\u0e31\u0e19\u0e14\u0e49\u0e27\u0e22\u0e04\u0e33\u0e2a\u0e31\u0e48\u0e07<\/p>\n<p>[shell]<\/p>\n<p>$ gcc ghosttest.c -o ghosttest<br \/>\n$ .\/ghosttest<\/p>\n<p>[\/shell]<\/p>\n<p>\u0e16\u0e49\u0e32\u0e23\u0e30\u0e1a\u0e1a\u0e44\u0e21\u0e48\u0e21\u0e35\u0e04\u0e27\u0e32\u0e21\u0e40\u0e2a\u0e35\u0e48\u0e22\u0e07\u0e08\u0e30\u0e44\u0e14\u0e49\u0e1c\u0e25\u0e2d\u0e2d\u0e01\u0e21\u0e32\u0e27\u0e48\u0e32<\/p>\n<pre>not vulnerable<\/pre>\n<p>\u0e16\u0e49\u0e32\u0e23\u0e30\u0e1a\u0e1a\u0e17\u0e35\u0e48\u0e21\u0e35\u0e04\u0e27\u0e32\u0e21\u0e40\u0e2a\u0e35\u0e48\u0e22\u0e07\u0e08\u0e30\u0e44\u0e14\u0e49\u0e1c\u0e25\u0e2d\u0e2d\u0e01\u0e21\u0e32\u0e27\u0e48\u0e32<\/p>\n<pre>vulnerable<\/pre>\n<p>\u0e43\u0e2b\u0e49\u0e40\u0e23\u0e32\u0e23\u0e35\u0e1a\u0e17\u0e33\u0e01\u0e32\u0e23 update patch \u0e41\u0e01\u0e49\u0e44\u0e02\u0e42\u0e14\u0e22\u0e14\u0e48\u0e27\u0e19<\/p>\n<p><strong>\u0e27\u0e34\u0e18\u0e35\u0e2b\u0e32\u0e27\u0e48\u0e32\u0e41\u0e2d\u0e1e\u0e1e\u0e25\u0e34\u0e40\u0e04\u0e0a\u0e31\u0e48\u0e19\u0e17\u0e35\u0e48\u0e17\u0e33\u0e07\u0e32\u0e19\u0e2d\u0e22\u0e39\u0e48\u0e1a\u0e19\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e27\u0e44\u0e2b\u0e19\u0e43\u0e0a\u0e49\u0e07\u0e32\u0e19 glibc \u0e1a\u0e49\u0e32\u0e07<\/strong><\/p>\n<p>\u0e43\u0e2b\u0e49\u0e1e\u0e34\u0e21\u0e1e\u0e4c\u0e04\u0e33\u0e2a\u0e31\u0e48\u0e07<\/p>\n<p>[shell]<\/p>\n<p>lsof | grep libc | awk &#8216;{print $1}&#8217; | sort | uniq<\/p>\n<p>[\/shell]<\/p>\n<p>\u0e2d\u0e22\u0e48\u0e32\u0e07\u0e40\u0e0a\u0e48\u0e19\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e1c\u0e21\u0e40\u0e2d\u0e07\u0e01\u0e47\u0e08\u0e30\u0e40\u0e2b\u0e47\u0e19\u0e41\u0e2d\u0e1e\u0e1e\u0e25\u0e34\u0e40\u0e04\u0e0a\u0e31\u0e48\u0e19\u0e17\u0e35\u0e48\u0e43\u0e0a\u0e49 glibc<\/p>\n<p>[shell]<\/p>\n<p>root@vagrant-ubuntu-trusty-64:~# lsof | grep libc | awk &#8216;{print $1}&#8217; | sort | uniq<br \/>\nacpid<br \/>\napache2<br \/>\natd<br \/>\nautomount<br \/>\nawk<br \/>\nbash<br \/>\ncontrol<br \/>\ncpuhotplu<br \/>\ncron<br \/>\ndbus-daem<br \/>\ndhclient<br \/>\ndocker.io<br \/>\ngetty<br \/>\ngrep<br \/>\nin:imklog<br \/>\nin:imuxso<br \/>\ninit<br \/>\nlsof<br \/>\nmemballoo<br \/>\npuppet<br \/>\nrpcbind<br \/>\nrpc.idmap<br \/>\nrpc.statd<br \/>\nrs:main<br \/>\nrsyslogd<br \/>\nruby<br \/>\nsort<br \/>\nsshd<br \/>\nsu<br \/>\nsudo<br \/>\nsystemd-l<br \/>\nsystemd-u<br \/>\ntimesync<br \/>\nuniq<br \/>\nupstart-f<br \/>\nupstart-s<br \/>\nupstart-u<br \/>\nVBoxServi<br \/>\nvminfo<br \/>\nvmstats<\/p>\n<p>[\/shell]<\/p>\n<p>\u0e01\u0e32\u0e23\u0e41\u0e01\u0e49\u0e44\u0e02\u0e1a\u0e19 RHEL\/CentOS<\/p>\n<p>[shell]<\/p>\n<p>sudo yum clean all<\/p>\n<p>sudo yum update<\/p>\n<p>[\/shell]<\/p>\n<p>\u0e2a\u0e38\u0e14\u0e17\u0e49\u0e32\u0e22\u0e01\u0e47\u0e2b\u0e32\u0e40\u0e27\u0e25\u0e32\u0e17\u0e35\u0e48\u0e40\u0e2b\u0e21\u0e32\u0e30\u0e2a\u0e21\u0e41\u0e25\u0e49\u0e27 reboot \u0e0b\u0e30<\/p>\n<p>[shell]<\/p>\n<p>sudo reboot<\/p>\n<p>[\/shell]<\/p>\n<p>\u0e01\u0e32\u0e23\u0e41\u0e01\u0e49\u0e44\u0e02\u0e1a\u0e19 Debian\/Ubuntu<\/p>\n<p>[shell]<br \/>\nsudo apt-get clean<\/p>\n<p>sudo apt-get update<\/p>\n<p>sudo apt-get dist-upgrade<\/p>\n<p>[\/shell]<\/p>\n<p>\u0e2a\u0e38\u0e14\u0e17\u0e49\u0e32\u0e22\u0e01\u0e47\u0e2b\u0e32\u0e40\u0e27\u0e25\u0e32\u0e17\u0e35\u0e48\u0e40\u0e2b\u0e21\u0e32\u0e30\u0e2a\u0e21\u0e41\u0e25\u0e49\u0e27 reboot \u0e0b\u0e30<\/p>\n<p>[shell]<br \/>\nsudo reboot<br \/>\n[\/shell]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0e21\u0e35\u0e23\u0e32\u0e22\u0e07\u0e32\u0e19\u0e27\u0e48\u0e32 \u0e1e\u0e1a\u0e1a\u0e31\u0e4a\u0e01\u0e23\u0e49\u0e32\u0e22\u0e41\u0e23\u0e07\u0e43\u0e19\u0e44\u0e25\u0e1a\u0e23\u0e32\u0e23\u0e35 glibc \u0e42\u0e14\u0e22\u0e1a\u0e23\u0e34\u0e29\u0e31\u0e17 Qualys \u0e1c\u0e39\u0e49\u0e04\u0e49\u0e19\u0e1e\u0e1a\u0e43\u0e2b\u0e49\u0e0a\u0e37\u0e48\u0e2d\u0e0a\u0e48\u0e2d\u0e07\u0e42\u0e2b\u0e27\u0e48\u0e19\u0e35\u0e49\u0e27\u0e48\u0e32 GHOST \u0e01\u0e23\u0e30\u0e17\u0e1a\u0e25\u0e34\u0e19\u0e38\u0e01\u0e0b\u0e4c RHEL (Red Hat Enterprise Linux) version 5.x,&#8230;<\/p>\n<div class=\"more-link-wrapper\"><a class=\"more-link\" href=\"https:\/\/engineerball.com\/blog\/2015\/01\/29\/how-to-fix-ghost-bugs-on-linux.html\">Read the post<span class=\"screen-reader-text\">\u0e41\u0e01\u0e49\u0e44\u0e02 GHOST \u0e1a\u0e31\u0e4a\u0e01\u0e23\u0e49\u0e32\u0e22\u0e41\u0e23\u0e07\u0e1a\u0e19\u0e23\u0e30\u0e1a\u0e1a\u0e25\u0e34\u0e19\u0e38\u0e01\u0e0b\u0e4c<\/span><\/a><\/div>\n","protected":false},"author":1,"featured_media":2127,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[5],"tags":[316,364,365,303,315,358,361,362],"jetpack_publicize_connections":[],"yoast_head":"<!-- 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