CVE-2023-50387

Publication date 13 February 2024

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.

Read the notes from the security team

Status

Package Ubuntu Release Status
bind9 24.10 oracular
Fixed 1:9.18.24-0ubuntu1
24.04 LTS noble
Fixed 1:9.18.24-0ubuntu1
23.10 mantic
Fixed 1:9.18.18-0ubuntu2.1
22.04 LTS jammy
Fixed 1:9.18.18-0ubuntu0.22.04.2
20.04 LTS focal
Fixed 1:9.16.48-0ubuntu0.20.04.1
18.04 LTS bionic
16.04 LTS xenial
14.04 LTS trusty
bind9-libs 24.10 oracular Not in release
24.04 LTS noble Not in release
23.10 mantic Not in release
22.04 LTS jammy
Needs evaluation
20.04 LTS focal
Needs evaluation
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
dnsmasq 24.10 oracular
Fixed 2.90-1
24.04 LTS noble
Fixed 2.90-1
23.10 mantic
Fixed 2.90-0ubuntu0.23.10.1
22.04 LTS jammy
Fixed 2.90-0ubuntu0.22.04.1
20.04 LTS focal
Fixed 2.90-0ubuntu0.20.04.1
18.04 LTS bionic
16.04 LTS xenial
14.04 LTS trusty Ignored end of ESM support, was needs-triage
isc-dhcp 24.10 oracular
Needs evaluation
24.04 LTS noble
Needs evaluation
23.10 mantic Ignored end of life, was needs-triage
22.04 LTS jammy
Not affected
20.04 LTS focal
Not affected
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected
knot-resolver 24.10 oracular
Not affected
24.04 LTS noble
Vulnerable, work in progress
23.10 mantic Ignored end of life, was needs-triage
22.04 LTS jammy
Needs evaluation
20.04 LTS focal
Needs evaluation
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
14.04 LTS trusty Not in release
pdns-recursor 24.10 oracular
Not affected
24.04 LTS noble
Vulnerable, work in progress
23.10 mantic Ignored end of life, was needs-triage
22.04 LTS jammy
Needs evaluation
20.04 LTS focal
Needs evaluation
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
14.04 LTS trusty Ignored end of standard support
unbound 24.10 oracular
Fixed 1.19.1-1ubuntu1
24.04 LTS noble
Fixed 1.19.1-1ubuntu1
23.10 mantic
Fixed 1.17.1-2ubuntu0.1
22.04 LTS jammy
Fixed 1.13.1-1ubuntu5.4
20.04 LTS focal
Fixed 1.9.4-2ubuntu1.5
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
14.04 LTS trusty Ignored end of ESM support, was needs-triage

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Notes

alexmurray

As of isc-dhcp-4.4.3-1, isc-dhcp vendors bind9 libs

mdeslaur

This is unlikely to affect isc-dhcp's use of bind9-libs and the vendored bind9 libs, marking as negligible

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
bind9
unbound

Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H