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Prevent command injection via admin email #974

merged 1 commit into from Jul 3, 2019


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commented Jul 2, 2019

By submitting this pull request, I confirm the following:

  • I have read and understood the contributors guide, as well as this entire template.
  • I have made only one major change in my proposed changes.
  • I have commented my proposed changes within the code.
  • I have tested my proposed changes.
  • I am willing to help maintain this change if there are issues with it later.
  • I give this submission freely and claim no ownership.
  • It is compatible with the EUPL 1.2 license
  • I have squashed any insignificant commits. (git rebase)
  • I have Signed Off all commits. (git commit --signoff)

What does this PR aim to accomplish?:
Prevent a possible command injection via the admin email. Credit goes to Christos Pierris (@pr0tean) for finding the bug.

How does this PR accomplish the above?:
Perform extra validation on the input email.

What documentation changes (if any) are needed to support this PR?:

Signed-off-by: Mcat12 <>
@Mcat12 Mcat12 added the Bugfix label Jul 2, 2019
@Mcat12 Mcat12 added this to the v5.0 milestone Jul 2, 2019
@Mcat12 Mcat12 requested a review from pi-hole/web-approvers Jul 2, 2019
DL6ER approved these changes Jul 2, 2019
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Following characters are preceded by a backslash: &#;|*?~<>^()[]{}$, \x0A and \xFF. 'and"` are escaped only if they are not paired.

This will allow @ to pass through and this is the only thing needed here.

@Mcat12 Mcat12 merged commit 00d9b3d into devel Jul 3, 2019
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@Mcat12 Mcat12 deleted the fix/admin-email-validation branch Jul 3, 2019
Mcat12 added a commit that referenced this pull request Sep 12, 2019
Prevent command injection via admin email
@Mcat12 Mcat12 modified the milestones: v5.0, v4.3.2 Sep 12, 2019
Mcat12 added a commit that referenced this pull request Sep 13, 2019
Prevent command injection via admin email

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commented Sep 21, 2019

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

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