CVE-2023-2828 Information

Description

Every named instance configured to run as a recursive resolver maintains a cache database holding the responses to the queries it has recently sent to authoritative servers. The size limit for that cache database can be configured using the max-cache-size statement in the configuration file; it defaults to 90% of the total amount of memory available on the host. When the size of the cache reaches 7/8 of the configured limit a cache-cleaning algorithm starts to remove expired and/or least-recently used RRsets from the cache to keep memory use below the configured limit.

It has been discovered that the effectiveness of the cache-cleaning algorithm used in named can be severely diminished by querying the resolver for specific RRsets in a certain order effectively allowing the configured max-cache-size limit to be significantly exceeded. This issue affects BIND 9 versions 9.11.0 through 9.16.41 9.18.0 through 9.18.15 9.19.0 through 9.19.13 9.11.3-S1 through 9.16.41-S1 and 9.18.11-S1 through 9.18.15-S1.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://kb.isc.org/docs/cve-2023-2828 http://www.openwall.com/lists/oss-security/2023/06/21/6

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5