CVE-2023-2828

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.

Affected products

Alt Linux, Almalinux, Astra Linux, Bind 9, Bind Server, Centos, Ibm Aix, Linuxmint

Isc Bind

≤ 9.16.41, 9.18.15, 9.19.13

Fix

Available

CVSS 3.1

7.5 HIGH

EPSS

3.8% (89th percentile)

Weakness

CWE-770

NVD status

Modified

Published

2023-06-21

No exploit for CVE-2023-2828 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.