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CVE-2016-7433

Publication date 13 January 2017

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

5.3 · Medium

Score breakdown

NTP before 4.2.8p9 does not properly perform the initial sync calculations, which allows remote attackers to unspecified impact via unknown vectors, related to a "root distance that did not include the peer dispersion."

Read the notes from the security team

Status

Package Ubuntu Release Status
ntp 17.04 zesty
Not affected
16.10 yakkety
Fixed 1:4.2.8p8+dfsg-1ubuntu2.1
16.04 LTS xenial
Fixed 1:4.2.8p4+dfsg-3ubuntu5.5
14.04 LTS trusty
Not affected
12.04 LTS precise Ignored end of life

Notes

mdeslaur

ntp-4.2.7p385, up to but not including ntp-4.2.8p9, and ntp-4.3.0 up to, but not including ntp-4.3.94. But the root-distance calculation in general is incorrect in all versions of ntp-4 until this release.

leosilva

for precise it's not needed since this issue seems to be caused by some regression and precise hasn't the code affect changed.

mdeslaur

trusty isn't vulnerable either

Patch details

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

Package Patch details
ntp

Severity score breakdown

Parameter Value
Base score 5.3 · Medium
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact Low
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

Related Ubuntu Security Notices (USN)

Other references