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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

Medium

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)
kinetic
Released (4.4.3-2ubuntu4)
jammy
Released (4.4.1-2.3ubuntu2.3)
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)
trusty
Released (4.2.4-7ubuntu12.13+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