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Urgent Microsoft Patch - Remote Code Execution Vulnerability
Posted by Julian Harse on 08 December 2017 06:49 PM

Microsoft have issued an emergency patch for a vulnerability in Windows Defender (CVE-2017-11937) affecting Windows Server 2016 (and Windows desktops 7–10) which potentially allows an attacker to execute malicious code on a system and could allow them to take control of it.

The update is being deployed to customer servers with Gold or Platinum management by CWCS system administrators. Any customers without management should perform a Windows Update as soon as possible to ensure that their servers are up to date with the latest security patches.

If you would like to discuss this update or any concerns with our support team, please call 0808 133 3247 or submit a support ticket. CWCS support are on hand 24/7/365 days a year to assist with your enquiry.

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Vulnerability (CVE-2017-2636) has been discovered in the Linux kernel
Posted by Nicky Longden on 14 March 2017 06:45 PM

A vulnerability (CVE-2017-2636) has been discovered in the Linux kernel which allows unprivileged local users to escalate their privileges. Combined with a remote code execution vulnerability, such as a vulnerability in a web application, this could potentially allow a remote attacker to take over the system. More technical details can be found at The vulnerability affects all recent versions of CentOS, Debian and Ubuntu, with the exception of CentOS 5. Fixes are already available for all currently supported releases of Debian and Ubuntu. When fixes are released for CentOS, this will be announced on the CentOS-announce mailing list ( We have already updated servers for our managed customers running Debian and Ubuntu, and will have been in touch to schedule reboots (as this is a kernel update, you are still vulnerable until you have rebooted). We will update managed CentOS servers as and when a fix is released. Please note that users of distributions that have reached the end of their support life (CentOS 4 and earlier, Debian 6 and earlier, any Ubuntu releases other than 12.04, 14.04, 16.04 and 16.10) are highly likely to be affected, but will not receive any security updates. We strongly recommend that users of such distributions contact us to discuss upgrade options as a matter of urgency. Please contact our sales team on 0800 1 777 000 if you would like to discuss your options.

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Remote code execution vulnerabilities have been discovered in the popular PHP mail sending libraries PHPMailer and SwiftMailer. Improper validation of email addresses potentially allows an attacker to execute arbitrary code as the user running PHP. These vulnerabilities could be employed for example to send out spam from the server, or to perform denial of service (DoS) attacks against other internet users. Combined with a local privilege escalation vulnerability or poorly set file permissions, they could also be used as a stepping stone to further compromise the server.

The vulnerabilities are fixed in PHPMailer version 5.2.20 and SwiftMailer version 5.4.5. It is highly recommended that all users upgrade to these or later versions as soon as possible. Note that an initial fix for PHPMailer, released as version 5.2.18, was found to be incomplete, so any server running this or version 5.2.19 is still vulnerable.

PHPMailer is used in many popular web applications, including Wordpress, Drupal and Joomla. If you run these or any other applications that include PHPMailer, you should install any updates as soon as they become available. If in doubt, contact the vendor and ask if they are vulnerable to any of the following CVEs, and if fixes are available:


More technical details of these vulnerabilities can be found
 by clicking on the relevant CVE above, or alternatively if you’d prefer to discuss this or any concerns with our support team, please call 0808 133 3247 or submit a support ticket.


CWCS advisors and support are on hand 24/7 365 days a year to assist with your enquiry.

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ICANN Domain Transfer Policy Update - 1 Dec 2016
Posted by Julian Harse on 30 November 2016 01:12 PM

On December 1, 2016, ICANN will enforce a new transfer policy that modifies the process of changing domain ownership from one registrant to another. The implementation of the policy is being imposed on all registrars including CWCS.

Up until now, this policy only covered domain transfers between registrars. The new policy now also covers the process of changing ownership of the domain from one entity to another (registrant to registrant). Now, every time a change of registrant takes place, a series of confirmation and approval emails are triggered. I.e. updates to a registrant’s first name, last name, organisation and email address and will require email approval before going into effect.

For more information, please see our FAQ.

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Dirty CoW - CVE-2016-5195
Posted by Thomas Foster on 21 October 2016 02:17 PM

A vulnerability has been discovered in the Linux kernel that potentially allows anyone with access to a local user account (either legitimately, or by exploiting e.g. in an insecure web application) to elevate their privileges to root, and thus take over the entire system. The vulnerability has been assigned the CVE (Common Vulnerabilities and Exposures) identifier CVE-2016-5195, and has been nicknamed Dirty CoW (CoW stands for Copy-on-Write, and refers to the part of the kernel in which the vulnerability was discovered). Red Hat have rated this vulnerability as Important, and an exploit has reportedly been seen "in the wild".

More (technical) information about the vulnerability can be found at

CWCS will install updates for managed servers when they become available as part of our usual security patching routine. Unmanaged customers are responsible for keeping their servers up-to-date themselves, however if you feel you're unable to do this will be able to apply patching for Dirty CoW as paid a special request. If this is a service you require please contact our sales department or 0800 1 777 000.

Users of Red Hat Enterprise Linux and CentOS versions 5, 6 and 7 are affected, although exploits that have been seen so far are reported not to affect versions 5 and 6. Red Hat have not yet released fixed versions of their kernel packages. When they do, it will be announced at These packages will be made available to CentOS users shortly thereafter. This will be announced on the CentOS-announce mailing list, which can be viewed at

In the meantime, advanced users may wish to mitigate the vulnerability by disabling ptrace functionality in the kernel as explained at However, please make sure that you have read and understood the caveats mentioned there before doing so.

Once fixed packages have been released, users of these Operating Systems should install them by running 'yum update' via SSH, and then reboot by running 'reboot', or using Tools & Settings -> Server Management -> Restart Server in Plesk, or System Reboot -> Graceful Server Reboot in WHM. Please note that you must update and then reboot; updating alone is not sufficient.

Users of supported Debian or Ubuntu distributions are also affected, unless they are running one of the following kernel versions (or later):

  • Debian 7 (Wheezy) - 3.2.82-1
  • Debian 8 (Jessie) - 3.16.36-1+deb8u2
  • Ubuntu 12.04 LTS (Precise Pangolin) - 3.2.0-113.155 or 3.13.0-100.147~precise1
  • Ubuntu 14.04 LTS (Trusty Tahr) - 3.13.0-100.147 or 4.4.0-45.66~14.04.1
  • Ubuntu 16.04 LTS (Xenial Xerus) - 4.4.0-45.66
  • Ubuntu 16.10 (Yakkety Yak) - 4.8.0-26.28

If your server is not running one of these kernels, you will need to update by running 'apt-get update && apt-get dist-upgrade' via SSH, and then reboot by running 'reboot', or using Tools & Settings -> Server Management -> Restart Server in Plesk. Please note that you must update and then reboot; updating alone is not sufficient.

Ubuntu users who are running an LTS enablement stack will need to ensure that their kernel version is still supported. This can be determined by running the 'hwe-support-status' command (see for more details).

You can determine the version of the currently running kernel on your server by running 'uname -r' via SSH. Alternatively, WHM users can find this information under Server Status -> Server Information -> System Information. For example, the following is from a server running the 2.6.32-642.4.2.el6.x86_64 kernel:

Linux 2.6.32-642.4.2.el6.x86_64 #1 SMP Tue Aug 23 19:58:13 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

This vulnerability affects all versions of the Linux kernel since 2.6.22 (released in 2007) until it was fixed on 18 October 2016, so if you are running a distribution not mentioned above, then it is almost certainly still vulnerable, but fixes may not be made available. Users of End Of Life distributions (i.e. Red Hat Enterprise Linux or CentOS before version 5, Debian before version 7, or Ubuntu versions other than 12.04, 14.04, 16.04 or 16.10) should contact customer services to discuss migrating to a newer platform as a matter of urgency.

If you have any questions, please do not hesitate to contact our support team on 0808 133 3247, or via

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