A security vulnerability has been discovered in the ImageMagick software suite that can potentially allow remote code execution.
Impact
All versions of ImageMagick are affected. An updated version has been committed and should be rolling out to repositories in the near future. Until a patch is available for all systems, ABACOHosting is taking steps to block the offending payloads. Additionally, a direct modification to ImageMagick’s policy file can reduce the risk of an exploit due to the vulnerability.
Resolution
A full resolution is not possible until a patch is released and applied. While that is anticipated to be available soon, in the interim, policies specifically blocking known exploits can be added directly to ImageMagick’s policy file, policy.xml. The file will be located in one of two possible directories, depending on how the software was installed:
/etc/ImageMagick/policy.xml
/usr/local/etc/ImageMagick-6/policy.xml
Once located, open policy.xml in your preferred text editor and add the following eight lines to the bottom of the file to help minimize the risks of exploit:
<policy domain="coder" rights="none" pattern="EPHEMERAL" />
<policy domain="coder" rights="none" pattern="HTTPS" />
<policy domain="coder" rights="none" pattern="MVG" />
<policy domain="coder" rights="none" pattern="MSL" />
<policy domain="coder" rights="none" pattern="TEXT" />
<policy domain="coder" rights="none" pattern="SHOW" />
<policy domain="coder" rights="none" pattern="WIN" />
<policy domain="coder" rights="none" pattern="PLT" />
Note: This post has been updated to reflect policies for four additional coders identified as potentially vulnerable. ImageMagick still should be upgraded when the latest release is made available even if the policy file has been manually edited.
Friday, May 6, 2016
Powered by WHMCompleteSolution
