In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can be an out-of-bounds write that crashes the connection instance, or erroneous data processing that divulges data from uninitialized heap memory.
Weakness
The product does not initialize a critical resource.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Exim | Exim | * | 4.99.2 (excluding) |
| Exim4 | Ubuntu | devel | * |
| Exim4 | Ubuntu | esm-infra-legacy/trusty | * |
| Exim4 | Ubuntu | esm-infra-legacy/xenial | * |
| Exim4 | Ubuntu | esm-infra/bionic | * |
| Exim4 | Ubuntu | esm-infra/focal | * |
| Exim4 | Ubuntu | esm-infra/xenial | * |
| Exim4 | Ubuntu | jammy | * |
| Exim4 | Ubuntu | noble | * |
| Exim4 | Ubuntu | questing | * |
| Exim4 | Ubuntu | resolute | * |
| Exim4 | Ubuntu | upstream | * |