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WordPress v4.5.3 vulnerable to Denial of Service (DoS) exploits via CVE-2016-6896 and CVE-2016-6897 – Here’s how to fix it

WordPress v4.5.3 vulnerable to Denial of Service (DoS) exploits via CVE-2016-6896 and CVE-2016-6897 – Here’s how to fix it

If your website runs on WordPress v4.5.3 website, attackers can now bring down your site through a Denial of Service attack. This is possible through two vulnerabilities that were disclosed on 22nd Aug:

  • CVE-2016-6897 – This is a Cross Site Request Forgery vulnerability by which an attacker can take over an authenticated user’s session (privilege escalation) using a forged HTML page.
  • CVE-2016-6896 – This is a Directory Traversal vulnerability which can be used by an attacker to crash the web server.

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How to mitigate VMware vIDM local privilege escalation vulnerability

How to mitigate VMware vIDM local privilege escalation vulnerability

VMWare has issued a latest security advisory VMSA-2016-0013, which addresses two critical vulnerabilities of VMWare products – CVE-2016-5335 and CVE-2016-5336.

These are severe vulnerabilities that affect VMware Identity Manager and vRealize Automation software. (more…)

Top 5 causes for email error “451 Temporary local problem – please try later” and How to fix it in Outlook, Exim, Postfix and MailEnable

Top 5 causes for email error “451 Temporary local problem – please try later” and How to fix it in Outlook, Exim, Postfix and MailEnable

451 Temporary local problem‘ is one of the most commonly reported email errors in web hosting servers.

Our Dedicated Support Engineers provide tech support & server management for many hosting companies, and we’ve seen several variants of this error. A typical error looks like this: (more…)

2 common causes for Email Error 551, and How to fix it in MailEnable, Plesk, Outlook, Thunderbird and Eudora

2 common causes for Email Error 551, and How to fix it in MailEnable, Plesk, Outlook, Thunderbird and Eudora

Email Error 551 is an SMTP error commonly seen in MailEnable servers, and is seen in two forms:

551 Sender address is not valid for your login

and

551 This mail server requires authentication before sending mail from a locally hosted domain

(more…)

How we setup AWS disk usage monitoring for EC2 instances

How we setup AWS disk usage monitoring for EC2 instances

An EC2 instance without enough free disk space, can crash instantly. That’s why having a proper AWS disk usage monitoring system is vital for EC2 instances.

Amazon provides CloudWatch monitoring script for EC2 Linux-based instances. But it requires additional customization to make it effective for disk usage monitoring.

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How to fix PHP FFmpeg error “Unable to load dynamic library ‘/usr/local/lib/php/extensions/no-debug-non-zts-20090626/ffmpeg.so'”

How to fix PHP FFmpeg error “Unable to load dynamic library ‘/usr/local/lib/php/extensions/no-debug-non-zts-20090626/ffmpeg.so'”

Server wide errors are always a panic situation for server owners. A single server wide error can affect multiple websites in a split-second.

To maintain business credibility, its therefore crucial to fix server wide errors promptly. At Bobcares, we do this for our shared hosting customers, with our technical support services. (more…)

How to fix ‘Disk usage warning’ alerts in cPanel/WHM servers

At Bobcares, we provide outsourced technical support services for shared hosting companies. During this service span, we’ve resolved a multitude of server issues and errors.

One among the very common issues faced by cPanel/WHM server owners is getting this disk usage warning email:

The filesystem “/dev/sda6”, which is mounted at “/”, has reached “warn” status because it is 84.73% full.

Notification Type:
 warn ?

Server:
 host.*******.***

(more…)

What causes SpamAssassin error “Use of uninitialized value in concatenation (.) or string” in cPanel/WHM servers

What causes SpamAssassin error “Use of uninitialized value in concatenation (.) or string” in cPanel/WHM servers

As an outsourced technical support provider for Shared Web Hosting Companies, we often encounter application errors and system faults. In the past couple of months, an error that’s often reported by cPanel/WHM users is:

Aug 17 00:25:24.450 [382682] warn: Use of uninitialized value in concatenation (.) or string at /usr/local/cpanel/3rdparty/perl/522/lib64/perl5/cpanel_lib/Mail/SpamAssassin/PerMsgStatus.pm line 3082.

(more…)

How to fix “HTTP/1.1 New Session Failed” error in Odin Plesk Windows Virtuozzo VPS servers

How to fix “HTTP/1.1 New Session Failed” error in Odin Plesk Windows Virtuozzo VPS servers

In our role as Outsourced Tech Support for web hosts, we manage both Windows and Linux servers of our customers. In Windows Virtuozzo servers, one of the common errors reported by Odin Plesk web owners is “HTTP/1.1 New Session Failed“.

All sites in the server would suddenly start showing this error, and refuse to load. Sometimes the error goes off all by itself, but often times it’ll lead to a VPS restart. (more…)

Easy guide to setup Amazon EC2 multiple IPs

Easy guide to setup Amazon EC2 multiple IPs

By default, an EC2 instance comes with just a single public IP. However, there are many scenarios where you need multiple public IPs for your web services to work.

For instance, multi-site WordPress hosting, multiple websites with SSL, high availability fail-over setup for services, network appliances like load balancer, etc. require multiple IPs. (more…)