The version of Sendmail 8.13.1-2 on Red Hat Enterprise Linux 4 Update 4 and earlier does not reject the localhost.localdomain domain name for e-mail messages that come from external hosts, which might allow remote attackers to spoof messages.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Enterprise_linux | Redhat | 4.0-update4 (including) | 4.0-update4 (including) |
| Red Hat Enterprise Linux 4 | RedHat | sendmail-0:8.13.1-3.2.el4 | * |
| Red Hat Enterprise Linux 5 | RedHat | sendmail-0:8.13.8-8.el5 | * |