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 don't plan to take any action because of this."
{
"cpe": "cpe:2.3:a:k-9_mail_project:k-9_mail:5.600:*:*:*:*:android:*:*",
"extracted_events": [
{
"introduced": "5.600"
},
{
"last_affected": "5.600"
}
],
"source": "CPE_STRING"
}