CVE-2024-1975: SIG(0) can be used to exhaust CPU resources

Description

If a server hosts a zone containing a "KEY" Resource Record, or a resolver DNSSEC-validates a "KEY" Resource Record from a DNSSEC-signed domain in cache, a client can exhaust resolver CPU resources by sending a stream of SIG(0) signed requests. This issue affects BIND 9 versions 9.0.0 through 9.11.37, 9.16.0 through 9.16.50, 9.18.0 through 9.18.27, 9.19.0 through 9.19.24, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.49-S1, and 9.18.11-S1 through 9.18.27-S1.

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)2.1% · higher than 82% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

B9

BIND 9 · ISC

9.0.0 through 9.11.37; 9.16.0 through 9.16.50; 9.18.0 through 9.18.27; 9.19.0 through 9.19.24; 9.9.3-S1 through 9.11.37-S1; 9.16.8-S1 through 9.16.49-S1; +1 more · source: vendor

BI

Bind · Isc

9.0 through 9.11.37; 9.16.0 through 9.16.50; 9.16.8 through 9.16.49-s1; 9.18.0 through 9.18.27; 9.18.11 through 9.18.27-s1; 9.19.0 through 9.19.24; +1 more · source: CISA