Описание
A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral. This has at least two potential effects: The performance of the recursing server can potentially be degraded by the additional work required to perform these fetches, and The attacker can exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor.
A flaw was found in BIND, where it does not sufficiently limit the number of fetches that can be performed while processing a referral response. This flaw allows an attacker to cause a denial of service attack. The attacker can also exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor.
Меры по смягчению последствий
Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 5 | bind | Out of support scope | ||
| Red Hat Enterprise Linux 5 | bind97 | Out of support scope | ||
| Red Hat Enterprise Linux 6 | bind | Fixed | RHSA-2020:2383 | 03.06.2020 |
| Red Hat Enterprise Linux 6.5 Advanced Update Support | bind | Fixed | RHSA-2020:3379 | 10.08.2020 |
| Red Hat Enterprise Linux 6.6 Advanced Update Support | bind | Fixed | RHSA-2020:3378 | 10.08.2020 |
| Red Hat Enterprise Linux 7 | bind | Fixed | RHSA-2020:2344 | 01.06.2020 |
| Red Hat Enterprise Linux 7.2 Advanced Update Support | bind | Fixed | RHSA-2020:3471 | 18.08.2020 |
| Red Hat Enterprise Linux 7.3 Advanced Update Support | bind | Fixed | RHSA-2020:3470 | 18.08.2020 |
| Red Hat Enterprise Linux 7.3 Telco Extended Update Support | bind | Fixed | RHSA-2020:3470 | 18.08.2020 |
| Red Hat Enterprise Linux 7.3 Update Services for SAP Solutions | bind | Fixed | RHSA-2020:3470 | 18.08.2020 |
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Дополнительная информация
Статус:
EPSS
8.6 High
CVSS3
Связанные уязвимости
A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral. This has at least two potential effects: The performance of the recursing server can potentially be degraded by the additional work required to perform these fetches, and The attacker can exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor.
A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral. This has at least two potential effects: The performance of the recursing server can potentially be degraded by the additional work required to perform these fetches, and The attacker can exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor.
A malicious actor who intentionally exploits this lack of effective li ...
A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral. This has at least two potential effects: The performance of the recursing server can potentially be degraded by the additional work required to perform these fetches, and The attacker can exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor.
Уязвимость DNS-сервера BIND, связанная с неконтролируемым расходом ресурсов, позволяющая нарушителю вызвать отказ в обслуживании
EPSS
8.6 High
CVSS3