Use-after-free vulnerability in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote authenticated users to possibly execute arbitrary code or cause a denial of service (crash) via crafted packets.
Weakness
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ntp | Ntp | 4.2.0 (including) | 4.2.8 (excluding) |
| Ntp | Ntp | 4.3.0 (including) | 4.3.77 (excluding) |
| Ntp | Ntp | 4.2.8 (including) | 4.2.8 (including) |
| Ntp | Ntp | 4.2.8-p1 (including) | 4.2.8-p1 (including) |
| Ntp | Ntp | 4.2.8-p1-beta1 (including) | 4.2.8-p1-beta1 (including) |
| Ntp | Ntp | 4.2.8-p1-beta2 (including) | 4.2.8-p1-beta2 (including) |
| Ntp | Ntp | 4.2.8-p1-beta3 (including) | 4.2.8-p1-beta3 (including) |
| Ntp | Ntp | 4.2.8-p1-beta4 (including) | 4.2.8-p1-beta4 (including) |
| Ntp | Ntp | 4.2.8-p1-beta5 (including) | 4.2.8-p1-beta5 (including) |
| Ntp | Ntp | 4.2.8-p1-rc1 (including) | 4.2.8-p1-rc1 (including) |
| Ntp | Ntp | 4.2.8-p1-rc2 (including) | 4.2.8-p1-rc2 (including) |
| Ntp | Ntp | 4.2.8-p2 (including) | 4.2.8-p2 (including) |
| Ntp | Ntp | 4.2.8-p2-rc1 (including) | 4.2.8-p2-rc1 (including) |
| Ntp | Ntp | 4.2.8-p2-rc2 (including) | 4.2.8-p2-rc2 (including) |
| Ntp | Ntp | 4.2.8-p2-rc3 (including) | 4.2.8-p2-rc3 (including) |
| Ntp | Ntp | 4.2.8-p3 (including) | 4.2.8-p3 (including) |
| Ntp | Ntp | 4.2.8-p3-rc1 (including) | 4.2.8-p3-rc1 (including) |
| Ntp | Ntp | 4.2.8-p3-rc2 (including) | 4.2.8-p3-rc2 (including) |
| Ntp | Ntp | 4.2.8-p3-rc3 (including) | 4.2.8-p3-rc3 (including) |
Potential Mitigations
References
- http://support.ntp.org/bin/view/Main/NtpBug2916
- http://www.securityfocus.com/bid/77276
- http://www.securitytracker.com/id/1033951
- https://bugzilla.redhat.com/show_bug.cgi?id=1274257
- https://security.gentoo.org/glsa/201607-15
- https://security.netapp.com/advisory/ntap-20171004-0001/
- http://support.ntp.org/bin/view/Main/NtpBug2916
- http://www.securityfocus.com/bid/77276
- http://www.securitytracker.com/id/1033951
- https://bugzilla.redhat.com/show_bug.cgi?id=1274257
- https://security.gentoo.org/glsa/201607-15
- https://security.netapp.com/advisory/ntap-20171004-0001/