NTP BUG 3610: process_control() should bail earlier on short packets

Last update: April 22, 2024 18:49 UTC (7e7bd5857)

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Summary

Resolved	4.2.8p14	03 Mar 2020
References	Bug 3610
Affects	All versions of ntpd up to, but not including ntp-4.2.8p14 and ntp-4.3.100.	Resolved in ntp-4.2.8p14 and ntp-4.3.100.
CVSS2 Score	0.0	AV:N/AC:L/Au:N/C:N/I:N/A:N
CVSS3 Score	0.0	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N

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Description

Fuzz testing detected that on systems that override the default and enable ntpdc (mode 7) packets, a short packet will cause ntpd to read uninitialized data.

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Mitigation

• Leave mode7 disabled.
• Pay attention to error messages logged by ntpd.
• Monitor your ntpd instances.

Upgrade to 4.2.8p14 or later.

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Credit

Reported by Philippe Antoine (Catena cyber with oss-fuzz).

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Timeline

• 2020 Mar 03: Public release
• 2020 Feb 17: Early Access Program Release: Premier and Partner Institutional Members
• 2019 Jun 05: Notification to Institutional Members
• 2019 May 30: Notification from reporter