filter.d/wuftpd.conf in Fail2ban 0.8.3 uses an incorrect regular expression that allows remote attackers to cause a denial of service (forced authentication failures) via a crafted reverse-resolved DNS name (rhost) entry that contains a substring that is interpreted as an IP address, a different vulnerability than CVE-2007-4321.
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Fail2ban | Fail2ban | 0.8.3 (including) | 0.8.3 (including) |
| Fail2ban | Ubuntu | dapper | * |
| Fail2ban | Ubuntu | gutsy | * |
| Fail2ban | Ubuntu | hardy | * |
| Fail2ban | Ubuntu | intrepid | * |
| Fail2ban | Ubuntu | jaunty | * |
| Fail2ban | Ubuntu | upstream | * |