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 attacker to obtain valid S/MIME or PGP signatures for arbitrary content to be displayed to a third party. NOTE: the vendor states We dont plan to take any action because of this.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| K-9_mail | K-9_mail_project | 5.600 (including) | 5.600 (including) |