ntp_request.c in ntpd in NTP before 4.2.4p8, and 4.2.5, allows remote attackers to cause a denial of service (CPU and bandwidth consumption) by using MODE_PRIVATE to send a spoofed (1) request or (2) response packet that triggers a continuous exchange of MODE_PRIVATE error responses between two NTP daemons.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ntp | Ntp | * | 4.2.2p4 (including) |
| Ntp | Ntp | 4.0.72 (including) | 4.0.72 (including) |
| Ntp | Ntp | 4.0.73 (including) | 4.0.73 (including) |
| Ntp | Ntp | 4.0.90 (including) | 4.0.90 (including) |
| Ntp | Ntp | 4.0.91 (including) | 4.0.91 (including) |
| Ntp | Ntp | 4.0.92 (including) | 4.0.92 (including) |
| Ntp | Ntp | 4.0.93 (including) | 4.0.93 (including) |
| Ntp | Ntp | 4.0.94 (including) | 4.0.94 (including) |
| Ntp | Ntp | 4.0.95 (including) | 4.0.95 (including) |
| Ntp | Ntp | 4.0.96 (including) | 4.0.96 (including) |
| Ntp | Ntp | 4.0.97 (including) | 4.0.97 (including) |
| Ntp | Ntp | 4.0.98 (including) | 4.0.98 (including) |
| Ntp | Ntp | 4.0.99 (including) | 4.0.99 (including) |
| Ntp | Ntp | 4.1.0 (including) | 4.1.0 (including) |
| Ntp | Ntp | 4.1.2 (including) | 4.1.2 (including) |
| Ntp | Ntp | 4.2.0 (including) | 4.2.0 (including) |
| Ntp | Ntp | 4.2.2 (including) | 4.2.2 (including) |
| Ntp | Ntp | 4.2.2p1 (including) | 4.2.2p1 (including) |
| Ntp | Ntp | 4.2.2p2 (including) | 4.2.2p2 (including) |
| Ntp | Ntp | 4.2.2p3 (including) | 4.2.2p3 (including) |
| Ntp | Ntp | 4.2.5 (including) | 4.2.5 (including) |
| Red Hat Enterprise Linux 3 | RedHat | ntp-0:4.1.2-6.el3 | * |
| Red Hat Enterprise Linux 4 | RedHat | ntp-0:4.2.0.a.20040617-8.el4_8.1 | * |
| Red Hat Enterprise Linux 5 | RedHat | ntp-0:4.2.2p1-9.el5_4.1 | * |
| Ntp | Ubuntu | dapper | * |
| Ntp | Ubuntu | devel | * |
| Ntp | Ubuntu | hardy | * |
| Ntp | Ubuntu | intrepid | * |
| Ntp | Ubuntu | jaunty | * |
| Ntp | Ubuntu | karmic | * |
| Ntp | Ubuntu | upstream | * |