CVE-2015-5300

Publication date 22 October 2015

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

The panic_gate check in NTP before 4.2.8p5 is only re-enabled after the first change to the system clock that was greater than 128 milliseconds by default, which allows remote attackers to set NTP to an arbitrary time when started with the -g option, or to alter the time by up to 900 seconds otherwise by responding to an unspecified number of requests from trusted sources, and leveraging a resulting denial of service (abort and restart).

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
ntp	15.10 wily	Fixed 1:4.2.6.p5+dfsg-3ubuntu8.1
	15.04 vivid	Fixed 1:4.2.6.p5+dfsg-3ubuntu6.2
	14.04 LTS trusty	Fixed 1:4.2.6.p5+dfsg-3ubuntu2.14.04.5
	12.04 LTS precise	Fixed 1:4.2.6.p3+dfsg-1ubuntu3.6

Notes

mdeslaur

as of 2015-10-22, not yet fixed upstream patch in redhat bug, but improved patch in comment #3 is restricted

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
ntp	Vendor: https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2015-5300 Vendor: http://pkgs.fedoraproject.org/cgit/ntp.git/plain/ntp-4.2.6p5-cve-2015-5300.patch

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-2783-1
NTP vulnerabilities
27 October 2015