High severity · published Feb 14, 2024
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…
7.5
CVSS
74.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)74.3% · higher than 99% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AI
Active IQ Unified Manager · Netapp
All versions, or not specified · source: NVD
BI
Bind · Isc
9.0.0 before 9.16.48; 9.9.3 before 9.16.48; 9.18.0 before 9.18.24; 9.18.11 before 9.18.24; 9.19.0 before 9.19.21 · source: NVD
BO
Bootstrap OS · Netapp
All versions, or not specified · source: NVD
DL
Debian Linux · Debian
10.0; 11.0 · source: NVD
EL
Enterprise Linux · Redhat
6.0; 7.0; 8.0; 8.2; 8.4 · source: NVD
FE
Fedora · Fedoraproject
38; 39 · source: NVD
HB
Hci Baseboard Management Controller · Netapp
All versions, or not specified · source: NVD
RE
Recursor · Powerdns
before 4.8.5; 4.9.0 before 4.9.3; 5.0.0 before 5.0.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-50868
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-50868
Issue Tracking
http://www.openwall.com/lists/oss-security/2024/02/16/2
Issue Tracking
http://www.openwall.com/lists/oss-security/2024/02/16/3
Vendor Advisory
https://access.redhat.com/security/cve/CVE-2023-50868
Issue Tracking
https://bugzilla.suse.com/show_bug.cgi?id=1219826
Technical Description
https://datatracker.ietf.org/doc/html/rfc5155
Vendor Advisory
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html
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