Описание
Tornado is a Python web framework and asynchronous networking library. When Tornado's multipart/form-data parser encounters certain errors, it logs a warning but continues trying to parse the remainder of the data. This allows remote attackers to generate an extremely high volume of logs, constituting a DoS attack. This DoS is compounded by the fact that the logging subsystem is synchronous. All versions of Tornado prior to 6.5.0 are affected. The vulnerable parser is enabled by default. Upgrade to Tornado version 6.50 to receive a patch. As a workaround, risk can be mitigated by blocking Content-Type: multipart/form-data in a proxy.
A flaw was found in Tornado. This vulnerability can lead to a a denial of service by generating an extremely high volume of log entries.
Отчет
This vulnerability marked as Important because it leverages the synchronous nature of the logging subsystem to induce a DoS condition. Specifically, malformed multipart/form-data payloads cause repeated, blocking log writes, which stall the event loop that underpins Tornado’s asynchronous architecture. Furthermore, because the vulnerable multipart parser is enabled by default, applications that are otherwise well-secured and do not even use file uploads can still be targeted unless they explicitly block these requests at a proxy.
Меры по смягчению последствий
No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 9 | pcs | Affected | ||
| Red Hat OpenShift Container Platform 4 | openshift4/ose-ovn-kubernetes | Not affected | ||
| Red Hat OpenShift Container Platform 4 | openshift4/ose-ovn-kubernetes-microshift-rhel9 | Not affected | ||
| Red Hat OpenShift Container Platform 4 | openshift4/ose-ovn-kubernetes-rhel9 | Not affected | ||
| Red Hat OpenShift Container Platform 4 | ose-ovn-kubernetes-base-container | Not affected | ||
| Red Hat OpenShift Container Platform 4 | python-pep517 | Not affected | ||
| Red Hat OpenShift Container Platform 4 | python-tornado | Not affected | ||
| Red Hat Enterprise Linux 10 | python-tornado | Fixed | RHSA-2025:8135 | 26.05.2025 |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support | python-tornado | Fixed | RHSA-2025:8664 | 09.06.2025 |
| Red Hat Enterprise Linux 8 | pcs | Fixed | RHSA-2025:8254 | 28.05.2025 |
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Дополнительная информация
Статус:
EPSS
7.5 High
CVSS3
Связанные уязвимости
Tornado is a Python web framework and asynchronous networking library. When Tornado's ``multipart/form-data`` parser encounters certain errors, it logs a warning but continues trying to parse the remainder of the data. This allows remote attackers to generate an extremely high volume of logs, constituting a DoS attack. This DoS is compounded by the fact that the logging subsystem is synchronous. All versions of Tornado prior to 6.5.0 are affected. The vulnerable parser is enabled by default. Upgrade to Tornado version 6.50 to receive a patch. As a workaround, risk can be mitigated by blocking `Content-Type: multipart/form-data` in a proxy.
Tornado is a Python web framework and asynchronous networking library. When Tornado's ``multipart/form-data`` parser encounters certain errors, it logs a warning but continues trying to parse the remainder of the data. This allows remote attackers to generate an extremely high volume of logs, constituting a DoS attack. This DoS is compounded by the fact that the logging subsystem is synchronous. All versions of Tornado prior to 6.5.0 are affected. The vulnerable parser is enabled by default. Upgrade to Tornado version 6.50 to receive a patch. As a workaround, risk can be mitigated by blocking `Content-Type: multipart/form-data` in a proxy.
Tornado is a Python web framework and asynchronous networking library. ...
EPSS
7.5 High
CVSS3