CVE-2022-2928

Published: 5 October 2022

In ISC DHCP 4.4.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1, when the function option_code_hash_lookup() is called from add_option(), it increases the option's refcount field. However, there is not a corresponding call to option_dereference() to decrement the refcount field. The function add_option() is only used in server responses to lease query packets. Each lease query response calls this function for several options, so eventually, the reference counters could overflow and cause the server to abort.

Priority

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package	Release	Status
isc-dhcp Launchpad, Ubuntu, Debian	bionic	Released (4.3.5-3ubuntu7.4)
	focal	Released (4.4.1-2.1ubuntu5.20.04.4)
	jammy	Released (4.4.1-2.3ubuntu2.3)
	kinetic	Released (4.4.3-2ubuntu4)
	trusty	Released (4.2.4-7ubuntu12.13+esm2) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	upstream	Released (4.4.3-P1,4.1-ESV-R16-P2)
	xenial	Released (4.3.3-5ubuntu12.10+esm2) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)

Severity score breakdown

Parameter	Value
Base score	6.5
Attack vector	Adjacent
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

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