smtp_mailaddr in smtp_session.c in OpenSMTPD 6.6, as used in OpenBSD 6.6 and other products, allows remote attackers to execute arbitrary commands as root via a crafted SMTP session, as demonstrated by shell metacharacters in a MAIL FROM field. This affects the uncommented default configuration. The issue exists because of an incorrect return value upon failure of input validation.
The product does not handle or incorrectly handles an exceptional condition.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Opensmtpd | Openbsd | 6.6 (including) | 6.6 (including) |
| Opensmtpd | Ubuntu | bionic | * |
| Opensmtpd | Ubuntu | eoan | * |
| Opensmtpd | Ubuntu | esm-apps/xenial | * |
| Opensmtpd | Ubuntu | trusty | * |
| Opensmtpd | Ubuntu | trusty/esm | * |
| Opensmtpd | Ubuntu | upstream | * |
| Opensmtpd | Ubuntu | xenial | * |