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CVE-2023-50868

Publication date 13 February 2024

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations.

Read the notes from the security team

Status

Package Ubuntu Release Status
bind9 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 24.04 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 24.04 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
Needs evaluation
isc-dhcp 24.04 LTS noble
Needs evaluation
23.10 mantic Ignored
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 24.04 LTS noble
Vulnerable, work in progress
23.10 mantic Ignored
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 24.04 LTS noble
Vulnerable, work in progress
23.10 mantic Ignored
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
unbound 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
Needs evaluation

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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
unbound