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Maniphest T4378

Outlook hanging opening mails with S/MIME signature
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Description

Open mails with S/MIME digital signature causes Outlook 365 local application to hang.
Windows 10 Enterprise 1803, 17134.590

Details

Version
3.1.5 / Outlook 365 / Windows 10

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matt256272 created this task.Feb 27 2019, 10:05 AM
aheinecke added a subscriber: aheinecke.Feb 27 2019, 12:56 PM

Hi, thanks for the report.

the problem is likely a slow CRL server (like cacert) which blocks the signature verification. You can use Kleopatra -> Settings -> Configure Kleopatra -> S/MIME validation -> "Never consult a CRL" to disable it.

We have it on our todo to improve this. E.g. we should already show the contents of the mail if a signature verification takes long. The issue for this is T4118

aheinecke closed this task as a duplicate of T4118: GpgOL: Mitigate S/MIME Denial of Service due to CRL stalling.Feb 27 2019, 12:57 PM