Gentoo: GLSA-201001-01: NTP: Denial of Service
Summary
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.
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
[ 1 ] CVE-2009-3563 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3563
Availability
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/201001-01
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.
![Dist Gentoo](/images/distros/dist-gentoo.png)
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 ------------------------------------------------------------------- 1 net-misc/ntp < 4.2.4_p7-r1 >= 4.2.4_p7-r1
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.