GLSA 201001-01: NTP: Denial of Service
| Severity: | normal |
| Title: | NTP: Denial of Service |
| Date: | 01/03/2010 |
| Bugs: | |
| ID: | 201001-01 |
Synopsis
A Denial of Service condition in ntpd can cause excessive CPU or bandwidth consumption.Background
NTP is a set of the Network Time Protocol programs.
Affected packages
| Package | Vulnerable | Unaffected | Architecture(s) |
|---|---|---|---|
| net-misc/ntp | < 4.2.4_p7-r1 | >= 4.2.4_p7-r1 | All supported architectures |
Description
Robin Park and Dmitri Vinokurov discovered that ntp_request.c in ntpd does not handle MODE_PRIVATE packets correctly, causing a continuous exchange of MODE_PRIVATE error responses between two NTP daemons or causing high CPU load on a single host.
Impact
A remote, unauthenticated attacker could send a specially crafted MODE_PRIVATE packet, allowing for a Denial of Service condition (CPU and bandwidth consumption).
Workaround
There is no known workaround at this time.
Resolution
All NTP users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/ntp-4.2.4_p7-r1"
References
Availability
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
Concerns?
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.
License
Copyright 2010 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.