ppp utility in FreeBSD 4.1.1 and earlier does not properly restrict access as specified by the "nat deny_incoming" command, which allows remote attackers to connect to the target system.
| Software | From | Fixed in |
|---|---|---|
| freebsd / freebsd | 4.1.1-stable | 4.1.1-stable.x |
| freebsd / freebsd | 3.5.1 | 3.5.1.x |
| freebsd / freebsd | 4.1 | 4.1.x |
| freebsd / freebsd | 4.0 | 4.0.x |
| freebsd / freebsd | 3.5 | 3.5.x |