Bug 1550218 (CVE-2018-7184) - CVE-2018-7184 ntp: Interleaved symmetric mode cannot recover from bad state
Summary: CVE-2018-7184 ntp: Interleaved symmetric mode cannot recover from bad state
Status: NEW
Alias: CVE-2018-7184
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1550228 1550229
Blocks: 1550226
TreeView+ depends on / blocked
Reported: 2018-02-28 19:41 UTC by Pedro Sampaio
Modified: 2019-09-29 14:34 UTC (History)
4 users (show)

Fixed In Version: ntp 4.2.8p11
Doc Type: If docs needed, set a value
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Clone Of:
Last Closed:

Attachments (Terms of Use)

System ID Priority Status Summary Last Updated
Red Hat Knowledge Base (Solution) 3451911 None None None 2018-05-21 02:21:11 UTC

Description Pedro Sampaio 2018-02-28 19:41:17 UTC
The fix for NtpBug2952 was incomplete, and while it fixed one problem it created another. Specifically, it drops bad packets before updating the "received" timestamp. This means a third-party can inject a packet with a zero-origin timestamp, meaning the sender wants to reset the association, and the transmit timestamp in this bogus packet will be saved as the most recent "received" timestamp. The real remote peer does not know this value and this will disrupt the association until the association resets.



Comment 1 Pedro Sampaio 2018-02-28 19:51:20 UTC
Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1550228]

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