Security Vulnerabilities fixed in Thunderbird 102.2.1
- August 31, 2022
- Fixed in
- Thunderbird 102.2.1
#CVE-2022-3033: Leaking of sensitive information when composing a response to an HTML email with a META refresh tag
- Sarah Jamie Lewis
If a Thunderbird user replied to a crafted HTML email containing a
meta tag, with 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,
message compose document.
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,
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
- Sarah Jamie Lewis
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.
- Thunderbird Team
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.
- Val Lorentz
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.