{"id":5770,"date":"2016-06-15T07:55:19","date_gmt":"2016-06-15T07:55:19","guid":{"rendered":"https:\/\/bodhost.com\/kb\/?p=5770"},"modified":"2026-02-26T14:03:11","modified_gmt":"2026-02-26T14:03:11","slug":"glibc-ghost-vulnerability","status":"publish","type":"post","link":"https:\/\/www.bodhost.com\/kb\/glibc-ghost-vulnerability\/","title":{"rendered":"GLIBC GHOST \u2013 How to Deal with it?"},"content":{"rendered":"<p><strong><\/strong><\/p>\r\n<p class=\"wp-block-paragraph\">A critical vulnerability in the glibc library has been announced by Red Hat Product Security, assigned as CVE-2015-0235, and is commonly called as \u2018GHOST\u2019.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">What is a GHOST?\u00a0<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">A buffer-overflow bug, GHOST affects the <span style=\"color: #3366ff;\">gethostbyname()<\/span> and <span style=\"color: #3366ff;\">gethostbyname2()<\/span> function calls in the glibc library. A remote attacker can make an application call to either of these functions to execute arbitrary code with the permissions of the user running the application.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Impact of GHOST<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">The <span style=\"color: #3366ff;\">gethostbyname()<\/span>\u00a0function call is used for resolving DNS which is a very common event. This vulnerability can be exploited by an attacker by triggering a buffer overflow by offering an invalid hostname argument to an application that performs a DNS resolution.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">There\u2019s a lot of confusion about the need to reboot due to GLIBC GHOST bug. Is it really essential to restart &#8216;vulnerable services&#8217; or reboot the server?<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">No doubt,\u00a0 you have to restart vulnerable services, yet there is no need to restart the whole server &#8211; if you know what it is running (Note: &#8211; In shared hosting &#8211; we actually do).<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">First of all &#8211; All services that use glibc don\u2019t need to restart. Only services that use <span style=\"color: #3366ff;\">gethostbyname<\/span>. That function is used to resolve the internet hostname to an IP address.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">To exploit this function, the attacker needs to be able to feed a specially crafted &#8216;host name&#8217; to the service. And service needs to process it without validating it first.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">That is not a common condition. For example \/sbin\/init, while using glibc will not be exploitable at all using the such bug. So, no need to restart it.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">So, what can be potentially exploitable, and restarted:<\/p>\r\n\r\n\r\n\r\n<ol class=\"wp-block-list\">\r\n<li>Exim: only when configured to resolve the remote hostname. Restart it.<\/li>\r\n\r\n\r\n\r\n<li>Apache &#8211; apache itself is not exploitable, but some modules might be checking remote hosts &#8211; so, why not restart it. You should also restart PHP FPM, mod_lsapi daemon if you are running it in self_starter mode.\u00a0 Restart it just in case<\/li>\r\n\r\n\r\n\r\n<li>LiteSpeed &#8211; restart it just in case.<\/li>\r\n\r\n\r\n\r\n<li>Nginx &#8211; it is not vulnerable, and most common configurations I have seen on shared hosts will not be vulnerable as well &#8211; but given how cheap it is to restart it &#8212; restart it.<\/li>\r\n\r\n\r\n\r\n<li>cPanel (or your favorite brand of the control panel) &#8211; yes, worth it, including cpHulkd. They might be not vulnerable at all &#8211; but with closed-source software &#8212; you never know, and such a restart is once again &#8211; cheap.<\/li>\r\n\r\n\r\n\r\n<li>PostgreSQL &#8211; we don&#8217;t really know, so restart it just in case.<\/li>\r\n\r\n\r\n\r\n<li>OpenSSH &#8212; it considered safe, but if you want to be really safe &#8212; restarting OpenSSH doesn&#8217;t require any server downtime.<\/li>\r\n\r\n\r\n\r\n<li>Postfix\/Sendmail &#8211; most likely it is safe, but same as with OpenSSH &#8212; restarting it doesn&#8217;t take much.<\/li>\r\n<\/ol>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Proftpd, pure-ftpd,vsftpd,xinetd, tcp_wrappers, Syslog, MySQL\/MariaDB &#8211;&gt; are all considered safe &#8211; but should be easy to restart if you feel like it.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Why so several people confused with rebooting the server?<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Unlike shared hosting servers &#8212; generic servers run various software &#8212; and it is really hard to predict which software is vulnerable and which is not. So, for them &#8211; the\u00a0best way to go is to reboot.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">In shared hosting &#8212; not as important.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Resolution<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">In order to avoid the possibility of an exploit \u2013<\/p>\r\n\r\n\r\n\r\n<ol class=\"wp-block-list\">\r\n<li>Update the glibc and nscd packages on your system using the packages related to the following errata:<br \/>\r\n<p>Red Hat Enterprise Linux Server 5: RHSA-2015:0090<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Red Hat Enterprise Linux Server (v. 6): RHSA-2015:0092<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Red Hat Enterprise Linux Server (v. 7): RHSA-2015:0092<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Red Hat Enterprise Linux Desktop 5: RHSA-2015:0090<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Red Hat Enterprise Linux Desktop 6: RHSA-2015:0092<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Red Hat Enterprise Linux Desktop 7: RHSA-2015:0092<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Red Hat Enterprise Linux HPC Node 6: RHSA-2015:0092<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Red Hat Enterprise Linux HPC Node 7: RHSA-2015:0092<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Red Hat Enterprise Linux Workstation 6: RHSA-2015:0092<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Red Hat Enterprise Linux Workstation 7: RHSA-2015:0092<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Red Hat Enterprise Linux Server EUS (v. 6.6): RHSA-2015:0092<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Red Hat Enterprise Linux Server EUS (v. 6.5): RHSA-2015:0099<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Red Hat Enterprise Linux Server EUS (v. 6.4): RHSA-2015:0099<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Red Hat Enterprise Linux Server EUS (v. 5.9): RHSA-2015:0099<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Red Hat Enterprise Linux ELS (v. 4): RHSA-2015:0101<\/p>\r\n<\/li>\r\n<\/ol>\r\n\r\n\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">\u00a02. Now reboot the system or restart all affected services \u2013<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">This vulnerability affects several applications on the system, therefore, the safest and recommended way to assure every application uses the updated glibc packages is to restart the system.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">But if you aren\u2019t able to restart the entire system after the update, run the following command to list all the running processes though you are using the old [in-built] version of glibc on your system.<\/p>\r\n\r\n\r\n\r\n<pre class=\"wp-block-preformatted\">lsof +c0 -d DEL | awk 'NR==1 || \/libc-\/ {print $2,$1,$4,$NF}' | column -t<\/pre>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">When the list gets generated, identify the public-facing services and restart them. Though might be a temporary solution, it isn\u2019t supported by Red Hat and if any problem arises, you asked to reboot the system prior to the beginning of any troubleshooting.<\/p>\r\n<p><strong><\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>A critical vulnerability in the glibc library has been announced by Red Hat Product Security, assigned as CVE-2015-0235, and is commonly called as \u2018GHOST\u2019. What is a GHOST?\u00a0 A buffer-overflow&hellip;<\/p>\n<p><a href=\"https:\/\/www.bodhost.com\/kb\/glibc-ghost-vulnerability\/\" class=\"more-link\">Read More<\/a><\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[664],"tags":[769,768],"class_list":["post-5770","post","type-post","status-publish","format-standard","hentry","category-web-hosting","tag-ghost-glibc-vulnerability-test","tag-glibc-ghost-exploit"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>GLIBC GHOST \u2013 How to Deal with it?<\/title>\n<meta name=\"description\" content=\"The GLIBC GHOST vulnerability is a critical security flaw that affects Linux systems. Learn how to identify and patch it to protect your system from potential attacks.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bodhost.com\/kb\/glibc-ghost-vulnerability\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"GLIBC GHOST \u2013 How to Deal with it?\" \/>\n<meta property=\"og:description\" content=\"The GLIBC GHOST vulnerability is a critical security flaw that affects Linux systems. Learn how to identify and patch it to protect your system from potential attacks.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.bodhost.com\/kb\/glibc-ghost-vulnerability\/\" \/>\n<meta property=\"og:site_name\" content=\"Knowledge Base - bodHOST\" \/>\n<meta property=\"article:published_time\" content=\"2016-06-15T07:55:19+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-26T14:03:11+00:00\" \/>\n<meta name=\"author\" content=\"anilr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"anilr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.bodhost.com\\\/kb\\\/glibc-ghost-vulnerability\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.bodhost.com\\\/kb\\\/glibc-ghost-vulnerability\\\/\"},\"author\":{\"name\":\"anilr\",\"@id\":\"https:\\\/\\\/www.bodhost.com\\\/kb\\\/#\\\/schema\\\/person\\\/8871ea0c76482a5a482e48538ae4dbb3\"},\"headline\":\"GLIBC GHOST \u2013 How to Deal with it?\",\"datePublished\":\"2016-06-15T07:55:19+00:00\",\"dateModified\":\"2026-02-26T14:03:11+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.bodhost.com\\\/kb\\\/glibc-ghost-vulnerability\\\/\"},\"wordCount\":804,\"publisher\":{\"@id\":\"https:\\\/\\\/www.bodhost.com\\\/kb\\\/#organization\"},\"keywords\":[\"ghost glibc vulnerability test\",\"glibc ghost exploit\"],\"articleSection\":[\"Web Hosting\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.bodhost.com\\\/kb\\\/glibc-ghost-vulnerability\\\/\",\"url\":\"https:\\\/\\\/www.bodhost.com\\\/kb\\\/glibc-ghost-vulnerability\\\/\",\"name\":\"GLIBC GHOST \u2013 How to Deal with it?\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.bodhost.com\\\/kb\\\/#website\"},\"datePublished\":\"2016-06-15T07:55:19+00:00\",\"dateModified\":\"2026-02-26T14:03:11+00:00\",\"description\":\"The GLIBC GHOST vulnerability is a critical security flaw that affects Linux systems. 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