Sending a flood of dynamic DNS updates may cause `named` to allocate large amounts of memory. This, in turn, may cause `named` to exit due to a lack of free memory. We are not aware of any cases where this has been exploited.
Memory is allocated prior to the checking of access permissions (ACLs) and is retained during the processing of a dynamic update from a client whose access credentials are accepted. Memory allocated to clients that are not permitted to send updates is released immediately upon rejection. The scope of this vulnerability is limited therefore to trusted clients who are permitted to make dynamic zone changes.
If a dynamic update is REFUSED, memory will be released again very quickly. Therefore it is only likely to be possible to degrade or stop `named` by sending a flood of unaccepted dynamic updates comparable in magnitude to a query flood intended to achieve the same detrimental outcome.
BIND 9.11 and earlier branches are also affected, but through exhaustion of internal resources rather than memory constraints. This may reduce performance but should not be a significant problem for most servers. Therefore we don't intend to address this for BIND versions prior to BIND 9.16. This issue affects BIND 9 versions 9.16.0 through 9.16.36, 9.18.0 through 9.18.10, 9.19.0 through 9.19.8, and 9.16.8-S1 through 9.16.36-S1.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade bind9.16-licenseUpgrade python3-bindUpgrade bind-pkcs11-develUpgrade bind-pkcs11-libsUpgrade bind9.16-develUpgrade bind9.16-docUpgrade bind-utilsUpgrade bind9.16-utilsUpgrade bind9.16Upgrade bind-lite-develUpgrade bind-sdb-chrootUpgrade python3-bind9.16Upgrade bind-pkcs11-utilsUpgrade bind-export-develUpgrade bind-docUpgrade bind-dnssec-utilsUpgrade bind9.16-chrootUpgrade bind-develUpgrade bind-export-libsUpgrade bind-chrootUpgrade bind9.16-libsUpgrade bind-libsUpgrade bind-licenseUpgrade bind-dnssec-docUpgrade bind9.16-dnssec-utilsUpgrade bind-pkcs11Upgrade bind-libs-liteUpgrade bindUpgrade bind-sdb | May 15, 2023 | Jan 26, 2023 |
| Alpine Linux | — | Upgrade bind | Aug 22, 2024 | Jan 25, 2023 |
| Amazon Linux Ami 2 | — | Upgrade bind-export-libsUpgrade bind-licenseUpgrade bind-utilsUpgrade bind-pkcs11-libsUpgrade bind-pkcs11-develUpgrade bind-libs-liteUpgrade bind-libsUpgrade bind-chrootUpgrade bind-pkcs11Upgrade bind-sdb-chrootUpgrade bind-pkcs11-utilsUpgrade bind-lite-develUpgrade bind-debuginfoUpgrade bind-export-develUpgrade bind-develUpgrade bindUpgrade bind-sdb | Jan 10, 2025 | Jan 26, 2023 |
| Amazon_linux_2023 | — | Upgrade bind-dlz-ldap-debuginfoUpgrade bind-pkcs11Upgrade bind-dlz-ldapUpgrade bind-dnssec-utilsUpgrade bind-dlz-sqlite3-debuginfoUpgrade bind-debugsourceUpgrade bind-develUpgrade bind-licenseUpgrade bind-libs-debuginfoUpgrade bind-dlz-mysql-debuginfoUpgrade bindUpgrade bind-dlz-mysqlUpgrade bind-dnssec-utils-debuginfoUpgrade bind-pkcs11-develUpgrade python3-bindUpgrade bind-dlz-filesystem-debuginfoUpgrade bind-pkcs11-libsUpgrade bind-utilsUpgrade bind-pkcs11-utils-debuginfoUpgrade bind-pkcs11-debuginfoUpgrade bind-chrootUpgrade bind-dnssec-docUpgrade bind-debuginfoUpgrade bind-dlz-sqlite3Upgrade bind-utils-debuginfoUpgrade bind-libsUpgrade bind-pkcs11-libs-debuginfoUpgrade bind-dlz-filesystemUpgrade bind-pkcs11-utils | Feb 17, 2025 | Jan 25, 2023 |
| Centos_linux | — | Upgrade bind-libs-debuginfoUpgrade bind-licenseUpgrade bind-dnssec-utilsUpgrade bind-libs-liteUpgrade bind-export-libsUpgrade bind-pkcs11-utilsUpgrade bind-debugsourceUpgrade bind-sdb-debuginfoUpgrade bind9.16-libsUpgrade bind-sdb-chrootUpgrade bind-dnssec-docUpgrade bind-lite-develUpgrade bindUpgrade bind-export-develUpgrade bind-chrootUpgrade bind-pkcs11-debuginfoUpgrade bind-utilsUpgrade bind-sdbUpgrade bind9.16-licenseUpgrade bind-utils-debuginfoUpgrade bind9.16-chrootUpgrade bind9.16-utilsUpgrade bind-develUpgrade bind9.16-libs-debuginfoUpgrade bind-pkcs11Upgrade python3-bindUpgrade bind-libsUpgrade bind9.16-dnssec-utils-debuginfoUpgrade bind9.16-dnssec-utilsUpgrade bind-pkcs11-libs-debuginfoUpgrade bind9.16-debuginfoUpgrade bind-debuginfoUpgrade bind-pkcs11-develUpgrade bind-libs-lite-debuginfoUpgrade bind9.16-utils-debuginfoUpgrade bind9.16-debugsourceUpgrade bind-pkcs11-utils-debuginfoUpgrade bind-pkcs11-libsUpgrade bind-dnssec-utils-debuginfoUpgrade python3-bind9.16Upgrade bind9.16Upgrade bind-export-libs-debuginfo | May 15, 2023 | Jan 26, 2023 |
| Debian | — | Upgrade bind9 | Jan 30, 2023 | Jan 26, 2023 |
| Dns Bind | — | Upgrade ISC BIND to latest version | Mar 7, 2023 | Jan 26, 2023 |
| Huawei Euleros 2_0_sp11 | — | Upgrade bind-licenseUpgrade python3-bindUpgrade bind-chrootUpgrade bind-pkcs11-libsUpgrade bind-utilsUpgrade bind-pkcs11Upgrade bind-libsUpgrade bind-dnssec-utilsUpgrade bindUpgrade bind-dnssec-docUpgrade bind-pkcs11-utils | May 8, 2023 | Jan 26, 2023 |
| Ibm Aix | — | Apply the fix or workaround for bind_advisory23 | Jul 27, 2023 | Jan 26, 2023 |
| Oracle_linux | — | Upgrade bind-utilsUpgrade bindUpgrade bind9.16-develUpgrade bind-develUpgrade bind-chrootUpgrade bind-docUpgrade bind-pkcs11-libsUpgrade bind-pkcs11-utilsUpgrade bind-libs-liteUpgrade bind9.16-docUpgrade bind9.16-libsUpgrade bind-sdbUpgrade bind-pkcs11Upgrade bind-lite-develUpgrade bind-dnssec-docUpgrade bind9.16Upgrade bind-sdb-chrootUpgrade bind9.16-utilsUpgrade bind-dnssec-utilsUpgrade bind9.16-licenseUpgrade bind-licenseUpgrade bind-export-develUpgrade bind9.16-dnssec-utilsUpgrade bind-pkcs11-develUpgrade bind-export-libsUpgrade bind-libsUpgrade python3-bind9.16Upgrade bind9.16-chrootUpgrade python3-bind | May 18, 2023 | Jan 25, 2023 |
| Redhat_linux | — | Upgrade bind-libs-debuginfoUpgrade dhcp-clientUpgrade dhcp-relayUpgrade bind-pkcs11-debuginfoUpgrade bind9.16-dnssec-utils-debuginfoUpgrade dhcp-serverUpgrade bind-pkcs11-libs-debuginfoUpgrade bind-pkcs11-utils-debuginfoUpgrade bind-sdb-debuginfoUpgrade dhcp-relay-debuginfoUpgrade dhcp-commonUpgrade bind-dnssec-utils-debuginfoUpgrade bind-pkcs11-libsUpgrade dhcp-debuginfoUpgrade python3-bindUpgrade bind9.16-docUpgrade python3-bind9.16Upgrade bind-licenseUpgrade bind9.16-libsUpgrade dhcp-debugsourceUpgrade bind-pkcs11-develUpgrade dhcp-libs-debuginfoUpgrade bind-sdb-chrootUpgrade bind-export-libsUpgrade bind9.16-utilsNo solution existsUpgrade bind9.16-debuginfoUpgrade bind9.16-licenseUpgrade dhcp-client-debuginfoUpgrade bind9.16-debugsourceUpgrade bind-docUpgrade bind-export-libs-debuginfoUpgrade bind-sdbUpgrade bind-lite-develUpgrade bind-libsUpgrade bind-export-develUpgrade bindUpgrade bind-utilsUpgrade bind-dnssec-utilsUpgrade bind9.16-libs-debuginfoUpgrade bind9.16-develUpgrade bind-debuginfoUpgrade bind-debugsourceUpgrade bind9.16-utils-debuginfoUpgrade bind9.16Upgrade bind-chrootUpgrade bind9.16-chrootUpgrade bind-utils-debuginfoUpgrade bind-develUpgrade bind-pkcs11-utilsUpgrade bind9.16-dnssec-utilsUpgrade bind-libs-lite-debuginfoUpgrade dhcp-libsUpgrade dhcp-server-debuginfoUpgrade bind-pkcs11Upgrade bind-libs-liteUpgrade bind-dnssec-doc | May 15, 2023 | Jan 26, 2023 |
| Suse | — | Upgrade bindUpgrade bind-chrootenvUpgrade bind-develUpgrade bind-docUpgrade libbind9-1600Upgrade libirs-develUpgrade bind-utilsUpgrade python3-bindUpgrade libirs1601Upgrade libisccc1600Upgrade libns1604Upgrade libisc1606Upgrade libisccfg1600Upgrade libdns1605 | Feb 13, 2023 | Jan 26, 2023 |
| Ubuntu | — | Upgrade bind9 | Mar 22, 2023 | Jan 26, 2023 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Jan 25, 2023 |
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