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Thunderbird 102.2.1 Security Update

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Der kostenlose Mailclient für Windows, MacOS und Linux, Thunderbird, erhielt das Security Release 102.2.1. Das Update ist als “high-impact security fixes” eingestuft und sollte umgehend installiert werden. Außerdem gibt es einige Bugfixes und Änderungen.

Thunderbird 102.2.1 Release Notes


Commandline argument to open Calendar at startup added (-calendar)


Buttons to connect automatically discovered Address Books and Calendar during Account Setup now displayed


  • Compacting IMAP folders failed when “Just mark as deleted” was set
  • Message threading status and sort order was not transferred when applying column layout to other folders
  • Folder names with half-width Kana characters were displayed incorrectly
  • Digital signing of messages was not disabled after switching to an identity that could not sign
  • POP message retrieval stopped after a network error occurred and connectivity was restored
  • Activity Manager didn’t show “Get Messages” activity when “Leave messages on server” was turned off and no new messages were found
  • Mail quota color did not update properly for multiple accounts
  • Profile export failed if an expected file did not exist
  • Check Spelling dialog could exceed screen size when many dictionaries were available
  • Dragging a news message to the Desktop caused Thunderbird to hang when synchronized for offline use
  • Remove All Expired Articles was not displayed on expired NNTP messages
  • Sending messages to encrypted Matrix rooms failed in some cases
  • Adding a CalDAV calendar on BSD-based OS’s failed due to DNS errors
  • Various visual and UX improvements

Known Issues

  • “Get Map” feature missing from address book for physical addresses
  • No dedicated “Department” field in address book

Security Fixes

#CVE-2022-3033: Leaking of sensitive information when composing a response to an HTML email with a META refresh tag

ReporterSarah Jamie LewisImpacthigh


If a Thunderbird user replied to a crafted HTML email containing a meta tag, with the meta tag having the http-equiv="refresh" attribute, and the content attribute specifying an URL, then Thunderbird started a network request to that URL, regardless of the configuration to block remote content. In combination with certain other HTML elements and attributes in the email, it was possible to execute JavaScript code included in the message in the context of the message compose document. The JavaScript code was able to perform actions including, but probably not limited to, read and modify the contents of the message compose document, including the quoted original message, which could potentially contain the decrypted plaintext of encrypted data in the crafted email. The contents could then be transmitted to the network, either to the URL specified in the META refresh tag, or to a different URL, as the JavaScript code could modify the URL specified in the document. This bug doesn’t affect users who have changed the default Message Body display setting to ‘simple html’ or ‘plain text’.


#CVE-2022-3032: Remote content specified in an HTML document that was nested inside an iframe’s srcdoc attribute was not blocked

ReporterSarah Jamie LewisImpactmoderate


When receiving an HTML email that contained an iframe element, which used a srcdoc attribute to define the inner HTML document, remote objects specified in the nested document, for example images or videos, were not blocked. Rather, the network was accessed, the objects were loaded and displayed.


#CVE-2022-3034: An iframe element in an HTML email could trigger a network request

ReporterThunderbird TeamImpactmoderate


When receiving an HTML email that specified to load an iframe element from a remote location, a request to the remote document was sent. However, Thunderbird didn’t display the document.


#CVE-2022-36059: Matrix SDK bundled with Thunderbird vulnerable to denial-of-service attack

ReporterVal LorentzImpactmoderate


Thunderbird users who use the Matrix chat protocol were vulnerable to a denial-of-service attack. An adversary sharing a room with a user had the ability to carry out an attack against affected clients, making it not show all of a user’s rooms or spaces and/or causing minor temporary corruption.


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