Over Dozen Popular Email Clients Found Vulnerable to Signature Spoofing Attacks

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 a dozen of popular email clients. The affected email clients include Thunderbird, Microsoft...

CVE-2018-18513

A crash can occur when processing a crafted S/MIME message or an XPI package containing a crafted signature. This can be used as a denial-of-service DOS attack because Thunderbird reopens the last seen message on restart, triggering the crash again. This vulnerability affects Thunderbird 60.5...

Code injection

A crash can occur when processing a crafted S/MIME message or an XPI package containing a crafted signature. This can be used as a denial-of-service DOS attack because Thunderbird reopens the last seen message on restart, triggering the crash again. This vulnerability affects Thunderbird 60.5...

CVE-2018-18513

A crash can occur when processing a crafted S/MIME message or an XPI package containing a crafted signature. This can be used as a denial-of-service DOS attack because Thunderbird reopens the last seen message on restart, triggering the crash again. This vulnerability affects Thunderbird 60.5...

Code injection

A flaw during verification of certain S/MIME signatures causes emails to be shown in Thunderbird as having a valid digital signature, even if the shown message contents aren't covered by the signature. The flaw allows an attacker to reuse a valid S/MIME signature to craft an email message with...

CVE-2018-18509

A flaw during verification of certain S/MIME signatures causes emails to be shown in Thunderbird as having a valid digital signature, even if the shown message contents aren't covered by the signature. The flaw allows an attacker to reuse a valid S/MIME signature to craft an email message with...

CVE-2018-18509

A flaw during verification of certain S/MIME signatures causes emails to be shown in Thunderbird as having a valid digital signature, even if the shown message contents aren't covered by the signature. The flaw allows an attacker to reuse a valid S/MIME signature to craft an email message with...

CVE-2018-18513

A crash can occur when processing a crafted S/MIME message or an XPI package containing a crafted signature. This can be used as a denial-of-service DOS attack because Thunderbird reopens the last seen message on restart, triggering the crash again. This vulnerability affects Thunderbird 60.5...

CVE-2018-18509

A flaw during verification of certain S/MIME signatures causes emails to be shown in Thunderbird as having a valid digital signature, even if the shown message contents aren't covered by the signature. The flaw allows an attacker to reuse a valid S/MIME signature to craft an email message with...

CVE-2018-18509

A flaw during verification of certain S/MIME signatures causes emails to be shown in Thunderbird as having a valid digital signature, even if the shown message contents aren't covered by the signature. The flaw allows an attacker to reuse a valid S/MIME signature to craft an email message with...

CVE-2018-18513

A crash can occur when processing a crafted S/MIME message or an XPI package containing a crafted signature. This can be used as a denial-of-service DOS attack because Thunderbird reopens the last seen message on restart, triggering the crash again. This vulnerability affects Thunderbird 60.5...

CVE-2018-18509

CVE-2018-18509 is a S/MIME signature verification flaw in Mozilla Thunderbird that allows a remote attacker to reuse a valid S/MIME signature to craft emails with arbitrary content, making the message appear signed even though content isn’t covered by the signature. Affected products are Thunderb...

CVE-2018-18513

CVE-2018-18513 is a Firefox/Thunderbird vulnerability where a crash can occur while processing a crafted S/MIME message or an XPI package with a crafted signature, allowing a denial-of-service attack as Thunderbird reopens the last seen message on restart and re-triggers the crash. Affected produ...

Design/Logic Flaw

K-9 Mail v5.600 can include the original quoted HTML code of a specially crafted, benign looking, email within digitally signed reply messages. The quoted part can contain conditional statements that show completely different text if opened in a different email client. This can be abused by an...

Design/Logic Flaw

In KDE Trojita 0.7, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted parts can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the...

CVE-2019-10735

In Claws Mail 3.14.1, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted parts can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the...

CVE-2019-10740

In Roundcube Webmail before 1.3.10, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted parts can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the...

Design/Logic Flaw

In Claws Mail 3.14.1, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted parts can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the...

CVE-2019-10732

In KDE KMail 5.2.3, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted parts can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the...

CVE-2019-10734

In KDE Trojita 0.7, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted parts can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the...