CVE-2023-50868: Unbound: disclosure of CVE-2023-50387 and CVE-2023-50868 DNSSEC validation vulnerabilities
First published: Mon Feb 12 2024(Updated: )
ISC BIND is vulnerable to a denial of service, caused by an error when preparing an NSEC3 closest encloser proof. By flooding the target resolver with queries, a remote attacker could exploit this vulnerability to cause CPU exhaustion on a DNSSEC-validating resolver.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2016 | ||
| Microsoft Windows Server 2012 R2 | ||
| Microsoft Windows Server 2022 | ||
| Microsoft Windows Server 2019 | ||
| Microsoft Windows Server 2019 | ||
| Microsoft Windows Server 2022 | ||
| Microsoft Windows Server 2012 R2 | ||
| Microsoft Windows Server 2012 x64 | ||
| Microsoft Windows Server 2012 x64 | ||
| Microsoft Windows Server 2022 23H2 | ||
| debian/bind9 | 1:9.16.50-1~deb11u2 1:9.16.50-1~deb11u3 1:9.18.28-1~deb12u2 1:9.18.33-1~deb12u2 1:9.20.4-4 1:9.20.5-1 | |
| debian/dnsjava | <=2.1.8-2 | 3.6.2-2 |
| debian/dnsmasq | <=2.85-1 | 2.85-1+deb11u1 2.90-4~deb12u1 2.91~test9-1 |
| debian/knot-resolver | <=5.3.1-1+deb11u1 | 5.6.0-1+deb12u1 5.7.4-2 |
| debian/pdns-recursor | <=4.4.2-3 | 4.8.8-1 4.8.8-1+deb12u1 5.1.3-2 5.2.0-2 |
| debian/systemd | <=247.3-7+deb11u5 | 247.3-7+deb11u6 252.33-1~deb12u1 257.3-1 |
| debian/unbound | 1.13.1-1+deb11u2 1.13.1-1+deb11u4 1.17.1-2+deb12u2 1.22.0-1 | |
| F5 BIG-IP and BIG-IQ Centralized Management | >=17.1.0<=17.1.1 | 17.1.2 |
| F5 BIG-IP and BIG-IQ Centralized Management | >=16.1.0<=16.1.5 | |
| F5 BIG-IP and BIG-IQ Centralized Management | >=15.1.0<=15.1.10 |
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Reference Links
- https://www.theregister.com/2024/02/13/dnssec_vulnerability_internet/
- https://www.theregister.com/2024/03/26/software_risk_scores/
- http://www.openwall.com/lists/oss-security/2024/02/16/2
- http://www.openwall.com/lists/oss-security/2024/02/16/3
- https://access.redhat.com/security/cve/CVE-2023-50868
- https://bugzilla.suse.com/show_bug.cgi?id=1219826
- https://datatracker.ietf.org/doc/html/rfc5155
- https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html
- https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1
- https://kb.isc.org/docs/cve-2023-50868
- https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html
- https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
- https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
- https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
- https://security.netapp.com/advisory/ntap-20240307-0008/
- https://www.isc.org/blogs/2024-bind-security-release/
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50868 (Advisory)
- https://www.theregister.com/2024/06/12/june_patch_tuesday/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
- https://launchpad.net/bugs/cve/CVE-2023-50868
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-50868
- https://nvd.nist.gov/vuln/detail/CVE-2023-50868
- https://security-tracker.debian.org/tracker/CVE-2023-50868
- https://ubuntu.com/security/CVE-2023-50868
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2264068
- https://fosstodon.org/@tychotithonus@infosec.exchange/111924626751024210
- https://github.com/NLnetLabs/unbound/releases/tag/release-1.19.1
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2263914
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2264102
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2264101
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2264364
- https://access.redhat.com/errata/RHSA-2024:0965
- https://access.redhat.com/errata/RHSA-2024:0977
- https://access.redhat.com/errata/RHSA-2024:0981
- https://access.redhat.com/errata/RHSA-2024:0982
- https://access.redhat.com/errata/RHSA-2024:1334
- https://access.redhat.com/errata/RHSA-2024:1335
- https://access.redhat.com/errata/RHSA-2024:1522
- https://access.redhat.com/errata/RHSA-2024:1543
- https://access.redhat.com/errata/RHSA-2024:1544
- https://access.redhat.com/errata/RHSA-2024:1545
- https://access.redhat.com/errata/RHSA-2024:1647
- https://access.redhat.com/errata/RHSA-2024:1648
- https://access.redhat.com/errata/RHSA-2024:1781
- https://access.redhat.com/errata/RHSA-2024:1782
- https://access.redhat.com/errata/RHSA-2024:1789
- https://access.redhat.com/errata/RHSA-2024:1801
- https://access.redhat.com/errata/RHSA-2024:1800
- https://access.redhat.com/errata/RHSA-2024:1804
- https://access.redhat.com/errata/RHSA-2024:1803
- https://access.redhat.com/errata/RHSA-2024:2551
- https://access.redhat.com/errata/RHSA-2024:2587
- https://access.redhat.com/errata/RHSA-2024:2696
- https://access.redhat.com/errata/RHSA-2024:2720
- https://access.redhat.com/errata/RHSA-2024:2721
- https://access.redhat.com/errata/RHSA-2024:2821
- https://access.redhat.com/errata/RHSA-2024:2890
- https://access.redhat.com/errata/RHSA-2024:3271
- https://access.redhat.com/errata/RHSA-2024:3741
- https://access.redhat.com/errata/RHSA-2024:3877
- https://access.redhat.com/errata/RHSA-2024:3929
- https://access.redhat.com/errata/RHSA-2024:11003
- https://access.redhat.com/errata/RHSA-2025:0039
- https://bugzilla.redhat.com/show_bug.cgi?id=2263917
- https://my.f5.com/manage/s/article/K000139084
- https://downloads.isc.org/isc/bind9/9.16.48/patches/0005-CVE-2023-50387-CVE-2023-50868.patch
- https://www.knot-resolver.cz/2024-02-13-knot-resolver-5.7.1.html
- https://github.com/CZ-NIC/knot-resolver/commit/e966b7fdb167add0ec37c56a954c2d847f627985
- https://github.com/CZ-NIC/knot-resolver/commit/eccb8e278c1cde0548cc570eac619feaa290cede
- https://github.com/CZ-NIC/knot-resolver/commit/b5051ac26f34358b40f9115f977fe1f54e8f581e
- https://github.com/CZ-NIC/knot-resolver/commit/24699e9f206a8f957b516cad22a8e5790d226836
- https://github.com/CZ-NIC/knot-resolver/commit/a05cf1d379d1af0958587bd111f791b72f404364
- https://github.com/CZ-NIC/knot-resolver/commit/9b421cdf91f987e0254a06ff2c4e8fbf76dc2b58
- https://github.com/CZ-NIC/knot-resolver/commit/5e80624b18d40ae44be704751d3b22943edf287f
- https://github.com/CZ-NIC/knot-resolver/commit/f9ba52e6f54bc1db122870df50cb364cb977436e
- https://github.com/CZ-NIC/knot-resolver/commit/b044babbee358dc305d770a1dab3a877c49468a7
- https://blog.powerdns.com/2024/02/13/powerdns-recursor-4-8-6-4-9-3-5-0-2-released
- https://github.com/PowerDNS/pdns/pull/13781
- https://nlnetlabs.nl/downloads/unbound/CVE-2023-50387_CVE-2023-50868.txt
- https://github.com/NLnetLabs/unbound/commit/92f2a1ca690a44880f4c4fa70a4b5a4b029aaf1c
- https://github.com/systemd/systemd/issues/31413
- https://github.com/systemd/systemd/commit/67d0ce8843d612a2245d0966197d4f528b911b66
- https://github.com/systemd/systemd/commit/eba291124bc11f03732d1fc468db3bfac069f9cb
- https://github.com/systemd/systemd-stable/commit/1ebdb19ff194120109b08bbf888bdcc502f83211
- https://github.com/systemd/systemd-stable/commit/572692f0bdd6a3fabe3dd4a3e8e5565cc69b5e14
- https://github.com/systemd/systemd-stable/commit/2f5edffa8ffd5210165ebe7604f07d23f375fe9a
- https://github.com/systemd/systemd-stable/commit/9899281c59a91f19c8b39362d203e997d2faf233
- https://github.com/systemd/systemd-stable/commit/7886eea2425fe7773cc012da0b2e266e33d4be12
- https://github.com/systemd/systemd-stable/commit/156e519d990a5662c719a1cbe80c6a02a2b9115f
- https://github.com/systemd/systemd-stable/commit/7633d969f3422f9ad380a512987d398e54764817
- https://github.com/systemd/systemd-stable/commit/b43bcb51ebf9aea21b1e280e1872056994e3f53d
- https://github.com/advisories/GHSA-mmwx-rj87-vfgr
- https://github.com/dnsjava/dnsjava/commit/711af79be3214f52daa5c846b95766dc0a075116
- https://www.ibm.com/support/pages/node/7182403 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2023-50868?
CVE-2023-50868 is classified as a high severity vulnerability due to its potential for denial of service attacks.
How does CVE-2023-50868 affect DNSSEC-validating resolvers?
CVE-2023-50868 can cause CPU exhaustion on DNSSEC-validating resolvers when exploited by an attacker flooding the resolver with queries.
What are the affected products in CVE-2023-50868?
CVE-2023-50868 affects multiple versions of Microsoft Windows Server, F5 BIG-IP, and several Debian packages such as bind9.
How can I mitigate the impact of CVE-2023-50868?
To mitigate CVE-2023-50868, apply the latest patches provided by the affected software vendors to remediate the vulnerability.
What type of attack is possible due to CVE-2023-50868?
CVE-2023-50868 allows for a denial of service attack, leading to performance issues for affected DNS resolvers.
- collector/oss-sec
- source/oss-sec
- alias/CVE-2023-50387
- alias/CVE-2023-50868
- alias/CVE-2023-4408
- alias/CVE-2023-5517
- alias/CVE-2023-5679
- alias/CVE-2023-6516
- collector/the-register
- source/The Register
- agent/title
- agent/type
- agent/remedy
- agent/author
- agent/first-publish-date
- agent/news-ai
- collector/nvd-api
- source/NVD
- collector/msrc
- source/Microsoft
- collector/msrc-cve
- agent/software-canonical-lookup
- alias/CVE-2024-30080
- alias/CVE-2024-30078
- alias/CVE-2024-4577
- alias/CVE-2024-4610
- alias/CVE-2024-28995
- alias/CVE-2024-23110
- collector/launchpad-cve
- source/Launchpad
- collector/mitre-cve
- source/MITRE
- collector/usn-cve
- source/Ubuntu
- agent/description
- collector/nvd-cve
- agent/source
- agent/severity
- agent/software-canonical-lookup-request
- collector/ibm-support
- source/IBM
- agent/last-modified-date
- agent/references
- agent/trending
- agent/tags
- agent/event
- collector/security-tracker-debian
- source/Debian
- agent/softwarecombine
- collector/redhat-bugzilla
- source/Red Hat
- collector/f5-advisory
- source/F5
- vendor/microsoft
- canonical/microsoft windows server 2016
- canonical/microsoft windows server 2012 r2
- canonical/microsoft windows server 2022
- canonical/microsoft windows server 2019
- canonical/microsoft windows server 2012 x64
- canonical/microsoft windows server 2022 23h2
- package-manager/debian
- vendor/f5
- canonical/f5 big-ip and big-iq centralized management
- version/f5 big-ip and big-iq centralized management/17.1.0
- version/f5 big-ip and big-iq centralized management/17.1.1
- version/f5 big-ip and big-iq centralized management/16.1.0
- version/f5 big-ip and big-iq centralized management/16.1.5
- version/f5 big-ip and big-iq centralized management/15.1.0
- version/f5 big-ip and big-iq centralized management/15.1.10