CVE-2023-50868

Description

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.

References

https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/

https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html

https://www.isc.org/blogs/2024-bind-security-release/

https://datatracker.ietf.org/doc/html/rfc5155

https://kb.isc.org/docs/cve-2023-50868

https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1

https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html

https://access.redhat.com/security/cve/CVE-2023-50868

https://bugzilla.suse.com/show_bug.cgi?id=1219826

http://www.openwall.com/lists/oss-security/2024/02/16/2 ([oss-security] 20240216 Re: Unbound: disclosure of CVE-2023-50387 and CVE-2023-50868 DNSSEC validation vulnerabilities) mailing-list

http://www.openwall.com/lists/oss-security/2024/02/16/3 ([oss-security] 20240216 Re: Unbound: disclosure of CVE-2023-50387 and CVE-2023-50868 DNSSEC validation vulnerabilities) mailing-list

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/ (FEDORA-2024-2e26eccfcb) vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/ (FEDORA-2024-e24211eff0) vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/ (FEDORA-2024-21310568fa) vendor-advisory

https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html ([debian-lts-announce] 20240221 [SECURITY] [DLA 3736-1] unbound security update) mailing-list

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/ (FEDORA-2024-b0f9656a76) vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/ (FEDORA-2024-4e36df9dfd) vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/ (FEDORA-2024-499b9be35f) vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/ (FEDORA-2024-c36c448396) vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/ (FEDORA-2024-c967c7d287) vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/ (FEDORA-2024-e00eceb11c) vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/ (FEDORA-2024-fae88b73eb) vendor-advisory

https://security.netapp.com/advisory/ntap-20240307-0008/

https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html ([debian-lts-announce] 20240517 [SECURITY] [DLA 3816-1] bind9 security update) mailing-list

cve.org CVE-2023-50868

nvd.nist.gov CVE-2023-50868

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