An attacker may perform a DoS attack to prevent a user from sending encrypted email to a correspondent. If an attacker creates a crafted OpenPGP key with a subkey that has an invalid self signature, and the Thunderbird user imports the crafted key, then Thunderbird may try to use the invalid subkey, but the RNP library rejects it from being used, causing encryption to fail. This vulnerability affects Thunderbird < 78.9.1.
Weakness
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Thunderbird | Mozilla | * | 78.9.1 (excluding) |
| Red Hat Enterprise Linux 7 | RedHat | thunderbird-0:78.9.1-1.el7_9 | * |
| Red Hat Enterprise Linux 8 | RedHat | thunderbird-0:78.9.1-1.el8_3 | * |
| Red Hat Enterprise Linux 8.1 Extended Update Support | RedHat | thunderbird-0:78.9.1-1.el8_1 | * |
| Red Hat Enterprise Linux 8.2 Extended Update Support | RedHat | thunderbird-0:78.9.1-1.el8_2 | * |
| Thunderbird | Ubuntu | bionic | * |
| Thunderbird | Ubuntu | devel | * |
| Thunderbird | Ubuntu | focal | * |
| Thunderbird | Ubuntu | groovy | * |
| Thunderbird | Ubuntu | hirsute | * |
| Thunderbird | Ubuntu | impish | * |
| Thunderbird | Ubuntu | jammy | * |
| Thunderbird | Ubuntu | kinetic | * |
| Thunderbird | Ubuntu | lunar | * |
| Thunderbird | Ubuntu | trusty | * |
| Thunderbird | Ubuntu | upstream | * |
| Thunderbird | Ubuntu | xenial | * |