Vulnerability Details : CVE-2023-50868
Potential exploit
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.
Vulnerability category: Denial of service
Products affected by CVE-2023-50868
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Exploit prediction scoring system (EPSS) score for CVE-2023-50868
60.30%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 98 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2023-50868
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/... |
N/A
|
N/A
|
MS-CVE-2023-50868 | 2024-06-11 |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
N/A
|
N/A
|
RedHat-CVE-2023-50868 | 2024-02-13 |
References for CVE-2023-50868
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/
[SECURITY] Fedora 38 Update: pdns-recursor-4.8.6-1.fc38 - package-announce - Fedora Mailing-Lists
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/
[SECURITY] Fedora 39 Update: pdns-recursor-4.9.3-1.fc39 - package-announce - Fedora Mailing-Lists
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https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1
v5.7.1 · Knot projects / Knot Resolver · GitLab
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https://access.redhat.com/security/cve/CVE-2023-50868
CVE-2023-50868- Red Hat Customer Portal
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
[SECURITY] Fedora 38 Update: bind9-next-9.19.21-1.fc38 - package-announce - Fedora Mailing-Lists
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https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
NLnet Labs - News - Unbound 1.19.1 released
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https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html
PowerDNS Security Advisory 2024-01: crafted DNSSEC records in a zone can lead to a denial of service in Recursor — PowerDNS Recursor documentation
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
[SECURITY] Fedora 39 Update: dnsmasq-2.90-1.fc39 - package-announce - Fedora Mailing-Lists
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https://security.netapp.com/advisory/ntap-20240307-0008/
CVE-2023-50868 ISC BIND Vulnerability in NetApp Products | NetApp Product Security
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http://www.openwall.com/lists/oss-security/2024/02/16/3
oss-security - Re: Unbound: disclosure of CVE-2023-50387 and CVE-2023-50868 DNSSEC validation vulnerabilities
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https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html
[SECURITY] [DLA 3816-1] bind9 security update
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https://bugzilla.suse.com/show_bug.cgi?id=1219826
1219826 – (CVE-2023-50868) VUL-0: CVE-2023-50868: unbound, bind, pdns, dnsmasq: Denial Of Service while trying to validate specially crafted DNSSEC responses
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/
[SECURITY] Fedora 38 Update: dnsmasq-2.90-1.fc38 - package-announce - Fedora Mailing-Lists
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
[SECURITY] Fedora 39 Update: bind9-next-9.19.21-1.fc39 - package-announce - Fedora Mailing-Lists
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https://www.isc.org/blogs/2024-bind-security-release/
BIND 9 Security Release and Multi-Vendor Vulnerability Handling - ISC
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https://kb.isc.org/docs/cve-2023-50868
CVE-2023-50868
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
[SECURITY] Fedora 38 Update: bind-dyndb-ldap-11.10-23.fc38 - package-announce - Fedora Mailing-Lists
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/
[SECURITY] Fedora 39 Update: unbound-1.19.1-2.fc39 - package-announce - Fedora Mailing-Lists
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/
[SECURITY] Fedora 38 Update: unbound-1.19.1-1.fc38 - package-announce - Fedora Mailing-Lists
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https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
[Dnsmasq-discuss] Announce: dnsmasq-2.90.
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https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html
[SECURITY] [DLA 3736-1] unbound security update
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http://www.openwall.com/lists/oss-security/2024/02/16/2
oss-security - Re: Unbound: disclosure of CVE-2023-50387 and CVE-2023-50868 DNSSEC validation vulnerabilities
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https://datatracker.ietf.org/doc/html/rfc5155
RFC 5155 - DNS Security (DNSSEC) Hashed Authenticated Denial of Existence
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/
[SECURITY] Fedora 39 Update: bind-dyndb-ldap-11.10-24.fc39 - package-announce - Fedora Mailing-Lists
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