The STARTTLS feature in Exim through 4.94.2 allows response injection (buffering) during MTA SMTP sending.
Weakness
The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Exim | Exim | * | 4.94.2 (including) |
| Exim4 | Ubuntu | bionic | * |
| Exim4 | Ubuntu | esm-infra-legacy/trusty | * |
| Exim4 | Ubuntu | esm-infra/bionic | * |
| Exim4 | Ubuntu | esm-infra/focal | * |
| Exim4 | Ubuntu | esm-infra/xenial | * |
| Exim4 | Ubuntu | focal | * |
| Exim4 | Ubuntu | hirsute | * |
| Exim4 | Ubuntu | impish | * |
| Exim4 | Ubuntu | trusty | * |
| Exim4 | Ubuntu | trusty/esm | * |
| Exim4 | Ubuntu | upstream | * |
| Exim4 | Ubuntu | xenial | * |
Potential Mitigations
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/10.html
- https://cwe.mitre.org/data/definitions/101.html
- https://cwe.mitre.org/data/definitions/105.html
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- https://cwe.mitre.org/data/definitions/9.html