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Altered RPMs notice from cPanel servers after CVE patch

Discussion in 'General Discussion' started by Sudofox, May 10, 2016.

  1. Sudofox

    Sudofox Member

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    I've been patching servers that are vulnerable to CVE-2016-3714, which involves exploiting vulnerable ImageMagick coders to run code. cPanel already patched its inbuilt version. However, since that change, additional vulnerable coders have been discovered. Because of this, I also patched the policy.xml for cPanel:

    /usr/local/cpanel/3rdparty/etc/ImageMagick-6/policy.xml

    Here is the ones in the cPanel fix:
    Code:
      <policy domain="coder" rights="none" pattern="EPHEMERAL" />
      <policy domain="coder" rights="none" pattern="URL" />
      <policy domain="coder" rights="none" pattern="HTTPS" />
      <policy domain="coder" rights="none" pattern="MVG" />
      <policy domain="coder" rights="none" pattern="MSL" />
    
    I am adding these lines:

    Code:
    <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" />
    
    However, it turns out that cPanel does not like my modification as it changes the files from the state they are upon installation. I could set the RPM to unmanaged, but that would prevent future updates from cPanel for its built in ImageMagick.

    How can I:

    - Stop the notification emails for check_cpanel_rpms and ImageMagick
    - Without disabling the emails for check_cpanel_rpms entirely, just for ImageMagick
    - Without making the RPM unmanaged, because it then won't receive future updates
    - Without removing the additional policy rules, because that will reintroduce access to the vulnerable coders

    I want the policy.xml to receive future updates as well, so that when the cPanel developers add the missing policy rules, it will also update the policy.xml.

    I have a feeling that some of these goals will conflict with each other due to how cPanel works. Additionally, I gave the assumption that cPanel will add those additional policy rules to the policy.xml; I do not however have anything to base this assumption on, so I would appreciate some insight as to whether this is in the works or not.

    What are some workable approaches in this situation?
     
  2. Sudofox

    Sudofox Member

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    *Here are

    The cPanel forums don't let me edit my messages ("Your content can not be submitted. This is likely because your content is spam-like or contains inappropriate elements. Please change your content or try again later. If you still have problems, please contact an administrator."). This is probably for the same reason that I am prevented from setting a profile picture or changing my username.
     
  3. cPanelMichael

    cPanelMichael Technical Support Community Manager
    Staff Member

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    Twitter:
    Hello,

    It's not possible to modify a file associated with a RPM provided by cPanel without the RPM check noticing the change. You will need to set this RPM to unamanged:

    Code:
    # rpm -qf  /usr/local/cpanel/3rdparty/etc/ImageMagick-6/policy.xml
    cpanel-ImageMagick-6.9.0-4.cp1154.x86_64
    Or, you could setup a post cPanel update event hook to modify the policy file after each cPanel update, and setup an email filter to discard notifications about that specific RPM.

    Thank you.
     
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  4. Sudofox

    Sudofox Member

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    Thanks, I will just let cPanel's RPM management sort it out.
     
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