CVE-2023-50868

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
mitreCNA
---
---
CVEADP
---
---
CISA-ADPADP
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 97%
Debian logo
Debian Releases
Debian Product
Codename
bind9
bullseye
1:9.16.50-1~deb11u2
no-dsa
bookworm
1:9.18.28-1~deb12u2
no-dsa
buster
no-dsa
bullseye (security)
1:9.16.50-1~deb11u1
fixed
bookworm (security)
1:9.18.28-1~deb12u2
fixed
sid
1:9.20.4-3
fixed
trixie
1:9.20.4-3
fixed
dnsjava
sid
vulnerable
bookworm
no-dsa
bullseye
no-dsa
buster
no-dsa
dnsmasq
bullseye
no-dsa
bookworm
no-dsa
buster
no-dsa
bullseye (security)
2.85-1+deb11u1
fixed
sid
2.90-7
fixed
trixie
2.90-7
fixed
knot-resolver
bullseye
no-dsa
bookworm
5.6.0-1+deb12u1
no-dsa
buster
no-dsa
bookworm (security)
5.6.0-1+deb12u1
fixed
sid
5.7.4-2
fixed
trixie
5.7.4-2
fixed
pdns-recursor
bullseye
no-dsa
bookworm
4.8.8-1
no-dsa
buster
no-dsa
bookworm (security)
4.8.8-1
fixed
sid
5.1.3-1
fixed
trixie
5.1.3-1
fixed
systemd
bullseye
no-dsa
bookworm
252.31-1~deb12u1
no-dsa
buster
no-dsa
bullseye (security)
247.3-7+deb11u6
fixed
trixie
257.1-4
fixed
sid
257.1-5
fixed
unbound
bullseye
1.13.1-1+deb11u2
no-dsa
bookworm
1.17.1-2+deb12u2
no-dsa
buster
no-dsa
bullseye (security)
1.13.1-1+deb11u4
fixed
bookworm (security)
1.17.1-2+deb12u2
fixed
sid
1.22.0-1
fixed
trixie
1.22.0-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
bind9
oracular
Fixed 1:9.18.24-0ubuntu1
released
noble
Fixed 1:9.18.24-0ubuntu1
released
mantic
Fixed 1:9.18.18-0ubuntu2.1
released
jammy
Fixed 1:9.18.18-0ubuntu0.22.04.2
released
focal
Fixed 1:9.16.48-0ubuntu0.20.04.1
released
bionic
Fixed 1:9.11.3+dfsg-1ubuntu1.19+esm3
released
xenial
Fixed 1:9.10.3.dfsg.P4-8ubuntu1.19+esm8
released
trusty
Fixed 1:9.9.5.dfsg-3ubuntu0.19+esm12
released
bind9-libs
oracular
dne
noble
dne
mantic
dne
jammy
needs-triage
focal
needs-triage
bionic
dne
xenial
dne
trusty
dne
dnsmasq
oracular
Fixed 2.90-1
released
noble
Fixed 2.90-1
released
mantic
Fixed 2.90-0ubuntu0.23.10.1
released
jammy
Fixed 2.90-0ubuntu0.22.04.1
released
focal
Fixed 2.90-0ubuntu0.20.04.1
released
bionic
Fixed 2.90-0ubuntu0.18.04.1+esm1
released
xenial
Fixed 2.90-0ubuntu0.16.04.1+esm1
released
trusty
ignored
isc-dhcp
oracular
needs-triage
noble
needs-triage
mantic
ignored
jammy
not-affected
focal
not-affected
bionic
needs-triage
xenial
not-affected
trusty
not-affected
knot-resolver
oracular
not-affected
noble
pending
mantic
ignored
jammy
needs-triage
focal
needs-triage
bionic
needs-triage
xenial
needs-triage
trusty
dne
pdns-recursor
oracular
not-affected
noble
pending
mantic
ignored
jammy
needs-triage
focal
needs-triage
bionic
needs-triage
xenial
needs-triage
trusty
ignored
unbound
oracular
Fixed 1.19.1-1ubuntu1
released
noble
Fixed 1.19.1-1ubuntu1
released
mantic
Fixed 1.17.1-2ubuntu0.1
released
jammy
Fixed 1.13.1-1ubuntu5.4
released
focal
Fixed 1.9.4-2ubuntu1.5
released
bionic
needs-triage
xenial
needs-triage
trusty
ignored
Common Weakness Enumeration
References
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/
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.debian.org/debian-lts-announce/2024/09/msg00001.html
https://lists.debian.org/debian-lts-announce/2024/11/msg00035.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.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
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/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/