CVE-2021-29969

If Thunderbird was configured to use STARTTLS for an IMAP connection, and an attacker injected IMAP server responses prior to the completion of the STARTTLS handshake, then Thunderbird didnt ignore the injected data. This could have resulted in Thunderbird showing incorrect information, for example the attacker could have tricked Thunderbird to show folders that didnt exist on the IMAP server. This vulnerability affects Thunderbird < 78.12.

Weakness

The product makes files or directories accessible to unauthorized actors, even though they should not be.

Affected Software

Extended Description

Web servers, FTP servers, and similar servers may store a set of files underneath a “root” directory that is accessible to the server’s users. Applications may store sensitive files underneath this root without also using access control to limit which users may request those files, if any. Alternately, an application might package multiple files or directories into an archive file (e.g., ZIP or tar), but the application might not exclude sensitive files that are underneath those directories. In cloud technologies and containers, this weakness might present itself in the form of misconfigured storage accounts that can be read or written by a public or anonymous user.

Potential Mitigations

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/150.html
• https://cwe.mitre.org/data/definitions/639.html

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1682370
• https://security.gentoo.org/glsa/202208-14
• https://www.mozilla.org/security/advisories/mfsa2021-30/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1682370
• https://security.gentoo.org/glsa/202208-14
• https://www.mozilla.org/security/advisories/mfsa2021-30/