Описание
If a server hosts a zone containing a "KEY" Resource Record, or a resolver DNSSEC-validates a "KEY" Resource Record from a DNSSEC-signed domain in cache, a client can exhaust resolver CPU resources by sending a stream of SIG(0) signed requests.
This issue affects BIND 9 versions 9.0.0 through 9.11.37, 9.16.0 through 9.16.50, 9.18.0 through 9.18.27, 9.19.0 through 9.19.24, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.49-S1, and 9.18.11-S1 through 9.18.27-S1.
A flaw was found in the bind9 package, where if a DNS server hosts a zone containing a "KEY" resource record or a DNS resolver utilizes the DNSSEC validate feature to validate a "KEY" resource record, a malicious client could exhaust the CPU resourced from the resolver by sending a stream of SIG(0) signed requests. This issue can lead to a denial of service.
Отчет
This vulnerability in the BIND9 package is classified as an important severity issue due to its potential to significantly disrupt DNS services, which are critical for internet functionality. The flaw allows a malicious client to exploit the DNSSEC validation process by sending a stream of SIG(0) signed requests, leading to CPU exhaustion on the resolver. This can cause a denial-of-service (DoS), rendering the DNS server unable to respond to legitimate queries. Given the widespread use of BIND9 in both enterprise and public DNS infrastructure, the impact of such an attack can be extensive, affecting numerous users and services reliant on DNS resolution.
Меры по смягчению последствий
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 6 | bind | Not affected | ||
| Red Hat Enterprise Linux 9 | bind9.18 | Not affected | ||
| Red Hat Enterprise Linux 9 | dhcp | Not affected | ||
| Red Hat Enterprise Linux 7.7 Advanced Update Support | bind | Fixed | RHSA-2024:5894 | 27.08.2024 |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support | bind | Fixed | RHSA-2024:5930 | 28.08.2024 |
| Red Hat Enterprise Linux 8 | bind9.16 | Fixed | RHSA-2024:5390 | 14.08.2024 |
| Red Hat Enterprise Linux 8 | bind | Fixed | RHSA-2024:5524 | 19.08.2024 |
| Red Hat Enterprise Linux 8 | bind | Fixed | RHSA-2024:5524 | 19.08.2024 |
| Red Hat Enterprise Linux 8.2 Advanced Update Support | bind | Fixed | RHSA-2024:5655 | 20.08.2024 |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | bind | Fixed | RHSA-2024:5871 | 26.08.2024 |
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Дополнительная информация
Статус:
EPSS
7.5 High
CVSS3
Связанные уязвимости
If a server hosts a zone containing a "KEY" Resource Record, or a resolver DNSSEC-validates a "KEY" Resource Record from a DNSSEC-signed domain in cache, a client can exhaust resolver CPU resources by sending a stream of SIG(0) signed requests. This issue affects BIND 9 versions 9.0.0 through 9.11.37, 9.16.0 through 9.16.50, 9.18.0 through 9.18.27, 9.19.0 through 9.19.24, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.49-S1, and 9.18.11-S1 through 9.18.27-S1.
If a server hosts a zone containing a "KEY" Resource Record, or a resolver DNSSEC-validates a "KEY" Resource Record from a DNSSEC-signed domain in cache, a client can exhaust resolver CPU resources by sending a stream of SIG(0) signed requests. This issue affects BIND 9 versions 9.0.0 through 9.11.37, 9.16.0 through 9.16.50, 9.18.0 through 9.18.27, 9.19.0 through 9.19.24, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.49-S1, and 9.18.11-S1 through 9.18.27-S1.
If a server hosts a zone containing a "KEY" Resource Record, or a reso ...
If a server hosts a zone containing a "KEY" Resource Record, or a resolver DNSSEC-validates a "KEY" Resource Record from a DNSSEC-signed domain in cache, a client can exhaust resolver CPU resources by sending a stream of SIG(0) signed requests. This issue affects BIND 9 versions 9.0.0 through 9.11.37, 9.16.0 through 9.16.50, 9.18.0 through 9.18.27, 9.19.0 through 9.19.24, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.49-S1, and 9.18.11-S1 through 9.18.27-S1.
EPSS
7.5 High
CVSS3