Encrypted S/MIME parts in a crafted multipart/alternative message can leak plaintext when included in a a HTML reply/forward. This vulnerability affects Thunderbird < 68.1 and Thunderbird < 60.9.
The product transmits sensitive or security-critical data in cleartext in a communication channel that can be sniffed by unauthorized actors.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Thunderbird | Mozilla | * | 60.9.0 (excluding) |
| Thunderbird | Mozilla | 68.0 (including) | 68.1.0 (excluding) |
| Red Hat Enterprise Linux 6 | RedHat | thunderbird-0:60.9.0-1.el6_10 | * |
| Red Hat Enterprise Linux 7 | RedHat | thunderbird-0:60.9.0-1.el7_7 | * |
| Red Hat Enterprise Linux 8 | RedHat | thunderbird-0:60.9.0-2.el8_0 | * |
| Thunderbird | Ubuntu | bionic | * |
| Thunderbird | Ubuntu | devel | * |
| Thunderbird | Ubuntu | disco | * |
| Thunderbird | Ubuntu | eoan | * |
| Thunderbird | Ubuntu | trusty | * |
| Thunderbird | Ubuntu | upstream | * |
| Thunderbird | Ubuntu | xenial | * |