An issue was discovered in tls_verify_crl in ProFTPD before 1.3.6. A wrong iteration variable, used when checking a client certificate against CRL entries (installed by a system administrator), can cause some CRL entries to be ignored, and can allow clients whose certificates have been revoked to proceed with a connection to the server.
The product does not validate, or incorrectly validates, a certificate.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Proftpd | Proftpd | * | 1.3.6 (excluding) |
| Proftpd-dfsg | Ubuntu | bionic | * |
| Proftpd-dfsg | Ubuntu | trusty | * |
| Proftpd-dfsg | Ubuntu | xenial | * |