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CVE-2022-2928

Publication date 5 October 2022

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

6.5 · Medium

Score breakdown

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.

Status

Package Ubuntu Release Status
isc-dhcp 22.10 kinetic
Fixed 4.4.3-2ubuntu4
22.04 LTS jammy
Fixed 4.4.1-2.3ubuntu2.3
20.04 LTS focal
Fixed 4.4.1-2.1ubuntu5.20.04.4
18.04 LTS bionic
Fixed 4.3.5-3ubuntu7.4
16.04 LTS xenial
14.04 LTS trusty

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Severity score breakdown

Parameter Value
Base score 6.5 · Medium
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

Related Ubuntu Security Notices (USN)

Other references