An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5. Meddler-in-the-middle attackers can pipeline commands after the POP3 STLS command, injecting plaintext commands into an encrypted user session.
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.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Courier_mail_server | Courier-mta | * | 1.1.5 (excluding) |
| Courier | Ubuntu | bionic | * |
| Courier | Ubuntu | hirsute | * |
| Courier | Ubuntu | impish | * |
| Courier | Ubuntu | kinetic | * |
| Courier | Ubuntu | lunar | * |
| Courier | Ubuntu | mantic | * |
| Courier | Ubuntu | trusty | * |
| Courier | Ubuntu | xenial | * |