Red Hat: CVE-2023-2828: named's configured cache size limit can be significantly exceeded (Multiple Advisories)
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.
Solution(s)
- redhat-upgrade-bind
- redhat-upgrade-bind-chroot
- redhat-upgrade-bind-debuginfo
- redhat-upgrade-bind-debugsource
- redhat-upgrade-bind-devel
- redhat-upgrade-bind-dnssec-doc
- redhat-upgrade-bind-dnssec-utils
- redhat-upgrade-bind-dnssec-utils-debuginfo
- redhat-upgrade-bind-doc
- redhat-upgrade-bind-export-devel
- redhat-upgrade-bind-export-libs
- redhat-upgrade-bind-export-libs-debuginfo
- redhat-upgrade-bind-libs
- redhat-upgrade-bind-libs-debuginfo
- redhat-upgrade-bind-libs-lite
- redhat-upgrade-bind-libs-lite-debuginfo
- redhat-upgrade-bind-license
- redhat-upgrade-bind-lite-devel
- redhat-upgrade-bind-pkcs11
- redhat-upgrade-bind-pkcs11-debuginfo
- redhat-upgrade-bind-pkcs11-devel
- redhat-upgrade-bind-pkcs11-libs
- redhat-upgrade-bind-pkcs11-libs-debuginfo
- redhat-upgrade-bind-pkcs11-utils
- redhat-upgrade-bind-pkcs11-utils-debuginfo
- redhat-upgrade-bind-sdb
- redhat-upgrade-bind-sdb-chroot
- redhat-upgrade-bind-sdb-debuginfo
- redhat-upgrade-bind-utils
- redhat-upgrade-bind-utils-debuginfo
- redhat-upgrade-bind9-16
- redhat-upgrade-bind9-16-chroot
- redhat-upgrade-bind9-16-debuginfo
- redhat-upgrade-bind9-16-debugsource
- redhat-upgrade-bind9-16-devel
- redhat-upgrade-bind9-16-dnssec-utils
- redhat-upgrade-bind9-16-dnssec-utils-debuginfo
- redhat-upgrade-bind9-16-doc
- redhat-upgrade-bind9-16-libs
- redhat-upgrade-bind9-16-libs-debuginfo
- redhat-upgrade-bind9-16-license
- redhat-upgrade-bind9-16-utils
- redhat-upgrade-bind9-16-utils-debuginfo
- redhat-upgrade-python3-bind
- redhat-upgrade-python3-bind9-16
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