Описание
Internationalized Domain Names in Applications (IDNA) for Python provides support for Internationalized Domain Names in Applications (IDNA) and Unicode IDNA Compatibility Processing. In versions prior to 3.15, payloads such as "\u0660" * N or "\u30fb" * N + "\u6f22" utilize the valid_contexto function prior to length rejection, and for high values of N will take a long time to process. This is the same issue as CVE-2024-3651, however the original remediation in 2024 was not a complete fix. A specially crafted argument to the idna.encode() function could consume significant resources. This may lead to a denial-of-service. Starting in version 3.14, the function rejects long inputs as soon as practicable prior to any further processing to minimize resource consumption. In version 3.15, this approach was extended to lesser used alternate functions (i.e. per-label conversions and codec support). A workaround is available. Domain names cannot exceed 253 characters in length. If this length limit is enforced prior to passing the domain to the idna.encode() function, it should no longer consume significant resources. This is triggered by arbitrarily large inputs that would not occur in normal usage, but may be passed to the library assuming there is no preliminary input validation by the higher-level application.
A flaw was found in the idna library, which handles Internationalized Domain Names in Python applications. A remote attacker could exploit this vulnerability by sending specially crafted, excessively long inputs to the library's encoding function. This could cause the system to consume significant resources, leading to a Denial of Service (DoS), where the affected application becomes unavailable to legitimate users. This issue stems from an incomplete fix for a previously identified vulnerability.
Отчет
A flaw was found in the python-idna library. This is an incomplete fix for CVE-2024-3651. The idna.encode() function performs contextual validation checks (valid_contexto) before rejecting oversized inputs, allowing specially crafted long payloads to cause excessive CPU consumption and lead to a denial of service. The fix in version 3.14 rejects long inputs early before further processing, and version 3.15 extends this approach to alternate per-label conversion and codec functions.
Меры по смягчению последствий
To mitigate this denial-of-service vulnerability, applications utilizing the idna Python library should implement input validation to ensure that domain names do not exceed the standard 253-character length limit before being passed to the idna.encode() function. This operational control prevents the processing of excessively long inputs that could lead to resource exhaustion and service unavailability.
Applications that pass user-controlled data directly to idna.encode() without validation checks (e.g.: DNS length < 254 chars) are affected.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Confidential Cluster Operator | confidential-clusters-beta/attestation-key-register-rhel9 | Fix deferred | ||
| Confidential Cluster Operator | confidential-clusters-beta/buildroot-rhel9 | Not affected | ||
| Confidential Cluster Operator | confidential-clusters-beta/compute-pcrs-rhel9 | Fix deferred | ||
| Confidential Cluster Operator | confidential-clusters-beta/confidential-cluster-operator-bundle | Fix deferred | ||
| Confidential Cluster Operator | confidential-clusters-beta/confidential-cluster-rhel9-operator | Fix deferred | ||
| Confidential Cluster Operator | confidential-clusters-beta/registration-server-rhel9 | Fix deferred | ||
| Confidential Compute Attestation | build-of-trustee/trustee-rhel9 | Not affected | ||
| Confidential Compute Attestation | openshift-sandboxed-containers/osc-podvm-payload-rhel9 | Not affected | ||
| Exploit Intelligence | exploit-intelligence-tech-preview/vulnerability-analysis-rhel9 | Fix deferred | ||
| External Secrets Operator for Red Hat OpenShift | external-secrets-operator/bitwarden-sdk-server-rhel9 | Fix deferred |
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Дополнительная информация
Статус:
EPSS
5.3 Medium
CVSS3
Связанные уязвимости
Internationalized Domain Names in Applications (IDNA) for Python provides support for Internationalized Domain Names in Applications (IDNA) and Unicode IDNA Compatibility Processing. In versions prior to 3.15, payloads such as `"\u0660" * N` or `"\u30fb" * N + "\u6f22"` utilize the `valid_contexto` function prior to length rejection, and for high values of `N` will take a long time to process. This is the same issue as CVE-2024-3651, however the original remediation in 2024 was not a complete fix. A specially crafted argument to the `idna.encode()` function could consume significant resources. This may lead to a denial-of-service. Starting in version 3.14, the function rejects long inputs as soon as practicable prior to any further processing to minimize resource consumption. In version 3.15, this approach was extended to lesser used alternate functions (i.e. per-label conversions and codec support). A workaround is available. Domain names cannot exceed 253 characters in length. If ...
Internationalized Domain Names in Applications (IDNA) for Python provides support for Internationalized Domain Names in Applications (IDNA) and Unicode IDNA Compatibility Processing. In versions prior to 3.15, payloads such as `"\u0660" * N` or `"\u30fb" * N + "\u6f22"` utilize the `valid_contexto` function prior to length rejection, and for high values of `N` will take a long time to process. This is the same issue as CVE-2024-3651, however the original remediation in 2024 was not a complete fix. A specially crafted argument to the `idna.encode()` function could consume significant resources. This may lead to a denial-of-service. Starting in version 3.14, the function rejects long inputs as soon as practicable prior to any further processing to minimize resource consumption. In version 3.15, this approach was extended to lesser used alternate functions (i.e. per-label conversions and codec support). A workaround is available. Domain names cannot exceed 253 characters in length. If thi
Internationalized Domain Names in Applications (IDNA) for Python provi ...
EPSS
5.3 Medium
CVSS3