Dozens of STARTTLS Related Flaws Found Affecting Popular Email Clients

guest · Aug 16, 2021

Dozens of STARTTLS Related Flaws Found Affecting Popular Email Clients
August 16, 2021
https://thehackernews.com/2021/08/dozens-of-starttls-related-flaws-found.html

Security researchers have disclosed as many as 40 different vulnerabilities associated with an opportunistic encryption mechanism in mail clients and servers that could open the door to targeted man-in-the-middle (MitM) attacks, permitting an intruder to forge mailbox content and steal credentials.

The now-patched flaws, identified in various STARTTLS implementations, were detailed by a group of researchers Damian Poddebniak, Fabian Ising, Hanno Böck, and Sebastian Schinzel at the 30th USENIX Security Symposium. In an Internet-wide scan conducted during the study, 320,000 email servers were found vulnerable to what's called a command injection attack.
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Some of the popular clients affected by the bugs include Apple Mail, Gmail, Mozilla Thunderbird, Claws Mail, Mutt, Evolution, Exim, Mail.ru, Samsung Email, Yandex, and KMail. The attacks require that the malicious party can tamper connections established between an email client and the email server of a provider and has login credentials for their own account on the same server.

"Upgrading connections via STARTTLS is fragile and vulnerable to a number of security vulnerabilities and attacks," the researchers noted, allowing a meddler-in-the-middle to inject plaintext commands that a "server would be interpret as if they were part of the encrypted connection," thereby enabling the adversary to steal credentials with the SMTP and IMAP protocols.
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Dozens of STARTTLS Related Flaws Found Affecting Popular Email Clients

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