Описание
Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. Versions 1.34.0 through 1.34.4 and 1.35.0 contain a use-after-free (UAF) vulnerability in the DNS cache, causing abnormal process termination. The vulnerability is in Envoy's Dynamic Forward Proxy implementation, occurring when a completion callback for a DNS resolution triggers new DNS resolutions or removes existing pending resolutions. This condition may occur when the following conditions are met: dynamic Forwarding Filter is enabled, the envoy.reloadable_features.dfp_cluster_resolves_hosts runtime flag is enabled, and the Host header is modified between the Dynamic Forwarding Filter and Router filters. This issue is resolved in versions 1.34.5 and 1.35.1. To work around this issue, set the envoy.reloadable_features.dfp_cluster_resolves_hosts runtime flag to false.
A memory corruption flaw was discovered in how the Envoy proxy handles its DNS cache. This issue could allow a specific sequence of DNS lookups to cause the Envoy process to crash.
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 |
|---|---|---|---|---|
| OpenShift Service Mesh 3 | openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9 | Not affected | ||
| OpenShift Service Mesh 3 | openshift-service-mesh/istio-cni-rhel9 | Not affected | ||
| OpenShift Service Mesh 3 | openshift-service-mesh/istio-must-gather-rhel9 | Not affected | ||
| OpenShift Service Mesh 3 | openshift-service-mesh/istio-pilot-rhel9 | Not affected | ||
| OpenShift Service Mesh 3 | openshift-service-mesh/istio-rhel9-operator | Not affected | ||
| OpenShift Service Mesh 3 | openshift-service-mesh/istio-sail-operator-bundle | Not affected | ||
| OpenShift Service Mesh 3 | openshift-service-mesh-tech-preview/istio-ztunnel-rhel9 | Not affected | ||
| Red Hat OpenShift Service Mesh 3.0 | registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9 | Fixed | RHSA-2025:16040 | 17.09.2025 |
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Дополнительная информация
Статус:
7.5 High
CVSS3
Связанные уязвимости
Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. Versions 1.34.0 through 1.34.4 and 1.35.0 contain a use-after-free (UAF) vulnerability in the DNS cache, causing abnormal process termination. The vulnerability is in Envoy's Dynamic Forward Proxy implementation, occurring when a completion callback for a DNS resolution triggers new DNS resolutions or removes existing pending resolutions. This condition may occur when the following conditions are met: dynamic Forwarding Filter is enabled, the `envoy.reloadable_features.dfp_cluster_resolves_hosts` runtime flag is enabled, and the Host header is modified between the Dynamic Forwarding Filter and Router filters. This issue is resolved in versions 1.34.5 and 1.35.1. To work around this issue, set the envoy.reloadable_features.dfp_cluster_resolves_hosts runtime flag to false.
Envoy is an open source L7 proxy and communication bus designed for la ...
Envoy: Race condition in Dynamic Forward Proxy leads to use-after-free and segmentation faults
7.5 High
CVSS3