5/8/2023 0 Comments Mailmate m3![]() It sounds too insecure."įast-forward 5 to 6 years later, and most businesses have started using AWS or a similar service. We would never use something like a cloud service. We interviewed more than 60 companies, and around 80 percent said something like, "Our company data is very confidential. That client was looking into this “cloud server trend” because the telecom company knew advances in the US eventually take root in Japan with a 4- to 5-years' delay. To put that into historical context: As some might remember, back then pretty much every company had an air-conditioned server room that secured company data in-house and provided an intranet for the office. An interesting case to look at is AWS.Ībout 15 years ago, I was doing a consultancy project for a Japanese telecom enterprise client, and they wanted to know if there was any demand for cloud computing and cloud services. To give some context about virtual mail in Japan, it is worth thinking about other technology offerings that first began abroad before becoming key to Japan today. Thus, TokyoMate Assistant and TokyoMate Receptionist were born. Over time, we expanded to provide a suite of services that offered a “back-office-as-a-service” solution for Japan’s business community. Researchers reported these vulnerabilities to affected vendors and developers, as well as suggested appropriate countermeasures, which have now been implemented in the latest versions of most of the affected software.TokyoMate, as you might know, started in 2019 as with a thesis of bringing the potential for virtual mailboxes to Japan. These attacks allow attackers to trick email clients into showing an unsigned text while verifying an unrelated signature in another part (which remains invisible).Ĥ) ID attacks (I1, I2, I3) - These attacks rely on the weaknesses in the binding of signed messages to the sender identity by mail clients, allowing attackers to display a valid signature from the identity (ID) of a trusted communication partner located in the mail header.ĥ) UI Attacks (U1) - User Interface (UI) redressing attacks are successful if attackers found a way to mimic, using HTML, CSS, or inline images, some important UI elements of an email client that could allow them to display an indicator of a valid signature. “The goal of our attacker Eve is to create and send an email with arbitrary content to Bob whose email client falsely indicates that the email has been digitally signed by Alice.”ġ) CMS Attacks (C1, C2, C3, C4) - Flaws due to mishandling of Cryptographic Message Syntax (CMS), the container format of S/MIME, lead to contradicting or unusual data structures, such as multiple signers or no signers.Ģ) GPG API Attacks (G1, G2) - Implementation flaws in many email clients fail to properly parse a wide range of different inputs that could allow attackers to inject arbitrary strings into GnuPG status line API and logging messages, tricking clients into displaying successful signature validation for arbitrary public keys.ģ) MIME Attacks (M1, M2, M3, M4) - MIME wrapping attacks abuse how email clients handle partially signed messages. ![]() “In our scenario, we assume two trustworthy communication partners, Alice and Bob, who have securely exchanged their public PGP keys or S/MIME certificates,” the team explains in a research paper published today. The research was conducted by a team of researchers from Ruhr University Bochum and Münster University of Applied Sciences, which includes Jens Müller, Marcus Brinkmann, Damian Poddebniak, Hanno Böck, Sebastian Schinzel, Juraj Somorovsky, and Jörg Schwenk. ![]() ![]() However, researchers tested 25 widely-used email clients for Windows, Linux, macOS, iOS, Android and Web and found that at least 14 of them were vulnerable to multiple types of practical attacks under five below-mentioned categories, making spoofed signatures indistinguishable from a valid one even by an attentive user. The affected email clients include Thunderbird, Microsoft Outlook, Apple Mail with GPGTools, iOS Mail, GpgOL, KMail, Evolution, MailMate, Airmail, K-9 Mail, Roundcube and Mailpile. A team of security researchers has discovered several vulnerabilities in various implementations of OpenPGP and S/MIME email signature verification that could allow attackers to spoof signatures on over dozen of popular email clients. ![]()
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