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 bind-pkcs11-develUpgrade bind-sdb-chrootUpgrade python3-bindUpgrade bind9.16-develUpgrade bind9.16Upgrade bind-lite-develUpgrade bind9.16-licenseUpgrade bind-pkcs11-libsUpgrade bind9.16-utilsUpgrade bind-utilsUpgrade bind9.16-docUpgrade bind-sdbUpgrade bindUpgrade bind-chrootUpgrade bind-export-develUpgrade bind-develUpgrade bind-licenseUpgrade python3-bind9.16Upgrade bind-dnssec-docUpgrade bind9.16-dnssec-utilsUpgrade bind-dnssec-utilsUpgrade bind-libs-liteUpgrade bind-pkcs11Upgrade bind9.16-libsUpgrade bind-pkcs11-utilsUpgrade bind9.16-chrootUpgrade bind-libsUpgrade bind-export-libsUpgrade bind-doc | May 15, 2023 | Jan 26, 2023 |
| Alpine Linux | — | Upgrade bind | Aug 22, 2024 | Jan 25, 2023 |
| Amazon Linux Ami 2 | — | Upgrade bind-export-develUpgrade bind-chrootUpgrade bind-pkcs11Upgrade bind-sdb-chrootUpgrade bind-libsUpgrade bind-debuginfoUpgrade bind-libs-liteUpgrade bind-lite-develUpgrade bind-pkcs11-utilsUpgrade bindUpgrade bind-develUpgrade bind-sdbUpgrade bind-utilsUpgrade bind-export-libsUpgrade bind-licenseUpgrade bind-pkcs11-libsUpgrade bind-pkcs11-devel | Jan 10, 2025 | Jan 26, 2023 |
| Amazon_linux_2023 | — | Upgrade bind-develUpgrade bind-dnssec-utils-debuginfoUpgrade bindUpgrade bind-dnssec-utilsUpgrade bind-dlz-mysqlUpgrade bind-dlz-ldapUpgrade bind-licenseUpgrade bind-dlz-mysql-debuginfoUpgrade bind-dlz-ldap-debuginfoUpgrade bind-libs-debuginfoUpgrade python3-bindUpgrade bind-pkcs11-develUpgrade bind-pkcs11Upgrade bind-dlz-sqlite3-debuginfoUpgrade bind-debugsourceUpgrade bind-utils-debuginfoUpgrade bind-pkcs11-debuginfoUpgrade bind-pkcs11-utils-debuginfoUpgrade bind-chrootUpgrade bind-libsUpgrade bind-utilsUpgrade bind-dlz-sqlite3Upgrade bind-pkcs11-libsUpgrade bind-dlz-filesystemUpgrade bind-debuginfoUpgrade bind-dnssec-docUpgrade bind-pkcs11-utilsUpgrade bind-pkcs11-libs-debuginfoUpgrade bind-dlz-filesystem-debuginfo | Feb 17, 2025 | Jan 25, 2023 |
| Centos_linux | — | Upgrade bind-pkcs11Upgrade bind9.16-libs-debuginfoUpgrade bind9.16-debuginfoUpgrade bind-debuginfoUpgrade python3-bind9.16Upgrade bind9.16Upgrade python3-bindUpgrade bind-export-libs-debuginfoUpgrade bind9.16-debugsourceUpgrade bind9.16-dnssec-utils-debuginfoUpgrade bind9.16-utils-debuginfoUpgrade bind-libs-lite-debuginfoUpgrade bind-pkcs11-develUpgrade bind-develUpgrade bind9.16-utilsUpgrade bind-pkcs11-libs-debuginfoUpgrade bind9.16-chrootUpgrade bind-libsUpgrade bind-dnssec-utils-debuginfoUpgrade bind-pkcs11-libsUpgrade bind-pkcs11-utils-debuginfoUpgrade bind9.16-dnssec-utilsUpgrade bind-dnssec-utilsUpgrade bind-debugsourceUpgrade bind-sdbUpgrade bind-libs-debuginfoUpgrade bind-export-develUpgrade bind-dnssec-docUpgrade bind-sdb-chrootUpgrade bindUpgrade bind-libs-liteUpgrade bind9.16-libsUpgrade bind-sdb-debuginfoUpgrade bind-export-libsUpgrade bind-pkcs11-utilsUpgrade bind-chrootUpgrade bind-pkcs11-debuginfoUpgrade bind-utilsUpgrade bind-lite-develUpgrade bind-utils-debuginfoUpgrade bind9.16-licenseUpgrade bind-license | 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-libsUpgrade bind-pkcs11-libsUpgrade python3-bindUpgrade bind-dnssec-utilsUpgrade bind-pkcs11Upgrade bind-chrootUpgrade bindUpgrade bind-dnssec-docUpgrade bind-pkcs11-utilsUpgrade bind-utilsUpgrade bind-license | 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-docUpgrade bind9.16-docUpgrade bind-develUpgrade bind-pkcs11-libsUpgrade bind9.16-develUpgrade bind-dnssec-docUpgrade bind-libs-liteUpgrade bind-utilsUpgrade bind-sdbUpgrade bind9.16-libsUpgrade bind-lite-develUpgrade bind-pkcs11Upgrade bind-chrootUpgrade bind-pkcs11-utilsUpgrade bindUpgrade python3-bindUpgrade bind9.16-chrootUpgrade bind-dnssec-utilsUpgrade bind9.16-utilsUpgrade bind-sdb-chrootUpgrade python3-bind9.16Upgrade bind9.16-dnssec-utilsUpgrade bind-export-develUpgrade bind9.16-licenseUpgrade bind-licenseUpgrade bind-pkcs11-develUpgrade bind-export-libsUpgrade bind-libsUpgrade bind9.16 | May 18, 2023 | Jan 25, 2023 |
| Redhat_linux | — | Upgrade bind-debuginfoUpgrade bind-chrootUpgrade bind9.16-utils-debuginfoUpgrade bind-lite-develUpgrade bind-develUpgrade bind-libsUpgrade bind-utils-debuginfoUpgrade bind-libs-lite-debuginfoUpgrade bind-dnssec-utilsUpgrade bind-export-develUpgrade bindUpgrade bind-pkcs11Upgrade bind-docUpgrade bind-dnssec-docUpgrade dhcp-server-debuginfoUpgrade bind-export-libs-debuginfoUpgrade dhcp-libsUpgrade bind9.16-dnssec-utilsUpgrade bind-debugsourceUpgrade bind-libs-liteUpgrade bind9.16-libs-debuginfoUpgrade bind-sdbUpgrade bind9.16Upgrade bind-pkcs11-utilsUpgrade bind9.16-develUpgrade bind-utilsUpgrade bind9.16-chrootUpgrade python3-bind9.16Upgrade bind9.16-docUpgrade bind-pkcs11-libsUpgrade bind-pkcs11-develUpgrade dhcp-client-debuginfoUpgrade dhcp-relayUpgrade bind-pkcs11-libs-debuginfoUpgrade bind-libs-debuginfoUpgrade dhcp-libs-debuginfoUpgrade bind-sdb-chrootUpgrade dhcp-debugsourceUpgrade bind-licenseUpgrade bind9.16-libsUpgrade bind9.16-licenseNo solution existsUpgrade bind-export-libsUpgrade python3-bindUpgrade bind9.16-dnssec-utils-debuginfoUpgrade bind9.16-utilsUpgrade bind9.16-debuginfoUpgrade bind-sdb-debuginfoUpgrade dhcp-relay-debuginfoUpgrade dhcp-commonUpgrade bind-dnssec-utils-debuginfoUpgrade dhcp-serverUpgrade bind9.16-debugsourceUpgrade bind-pkcs11-debuginfoUpgrade dhcp-clientUpgrade bind-pkcs11-utils-debuginfoUpgrade dhcp-debuginfo | May 15, 2023 | Jan 26, 2023 |
| Suse | — | Upgrade libisc1606Upgrade python3-bindUpgrade libdns1605Upgrade libisccfg1600Upgrade libns1604Upgrade libisccc1600Upgrade bind-utilsUpgrade libirs1601Upgrade bindUpgrade bind-chrootenvUpgrade bind-docUpgrade libbind9-1600Upgrade bind-develUpgrade libirs-devel | 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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