The match_component function in smtp-tls.c in libESMTP 1.0.3.r1, and possibly other versions including 1.0.4, treats two strings as equal if one is a substring of the other, which allows remote attackers to spoof trusted certificates via a crafted subjectAltName.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Libesmtp | Stafford.uklinux | 0.6 | 0.6 |
| Libesmtp | Stafford.uklinux | 0.2 | 0.2 |
| Libesmtp | Stafford.uklinux | 0.7.1 | 0.7.1 |
| Libesmtp | Stafford.uklinux | 0.8.3 | 0.8.3 |
| Libesmtp | Stafford.uklinux | 0.8.0 | 0.8.0 |
| Libesmtp | Stafford.uklinux | 1.0.1 | 1.0.1 |
| Libesmtp | Stafford.uklinux | 0.1 | 0.1 |
| Libesmtp | Stafford.uklinux | 0.8.9 | 0.8.9 |
| Libesmtp | Stafford.uklinux | 0.5 | 0.5 |
| Libesmtp | Stafford.uklinux | 0.8.6 | 0.8.6 |
| Libesmtp | Stafford.uklinux | 1.0.3 | 1.0.3 |
| Libesmtp | Stafford.uklinux | 0.8.10 | 0.8.10 |
| Libesmtp | Stafford.uklinux | 0.6.1 | 0.6.1 |
| Libesmtp | Stafford.uklinux | 1.0.3 | 1.0.3 |
| Libesmtp | Stafford.uklinux | 0.8.4 | 0.8.4 |
| Libesmtp | Stafford.uklinux | 0.3 | 0.3 |
| Libesmtp | Stafford.uklinux | 1.0 | 1.0 |
| Libesmtp | Stafford.uklinux | 1.0 | 1.0 |
| Libesmtp | Stafford.uklinux | 0.6 | 0.6 |
| Libesmtp | Stafford.uklinux | 0.7.0 | 0.7.0 |
| Libesmtp | Stafford.uklinux | 0.8.5 | 0.8.5 |
| Libesmtp | Stafford.uklinux | 0.4 | 0.4 |
| Libesmtp | Stafford.uklinux | 0.8.8 | 0.8.8 |
| Libesmtp | Stafford.uklinux | 1.0.2 | 1.0.2 |
| Libesmtp | Stafford.uklinux | 0.8.10 | 0.8.10 |
| Libesmtp | Stafford.uklinux | 0.8.12 | 0.8.12 |
| Libesmtp | Stafford.uklinux | 0.8.1 | 0.8.1 |
| Libesmtp | Stafford.uklinux | 0.8.2 | 0.8.2 |
| Libesmtp | Stafford.uklinux | 0.8.7 | 0.8.7 |
| Libesmtp | Stafford.uklinux | 0.8.11 | 0.8.11 |
| Libesmtp | Stafford.uklinux | 1.0.4 | 1.0.4 |
| Libesmtp | Stafford.uklinux | 0.1 | 0.1 |