Описание
Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connection down instead of buffering and blocking.
A flaw was found in golang.org/x/crypto/ssh. After a channel has been established, a remote malicious peer could send specially crafted messages. This could lead to a deadlock of the entire connection, resulting in a Denial of Service (DoS) for the affected system.
Отчет
A malicious SSH peer can send crafted channel messages after a connection is established, causing the affected SSH connection to become unresponsive. This vulnerability does not affect confidentiality or integrity. Red Hat rates this issue as Moderate because the demonstrated availability impact is limited to the affected connection.
Меры по смягчению последствий
Red Hat is not aware of a practical mitigation that fully prevents this issue while maintaining affected SSH functionality. Where operationally possible, restrict SSH connectivity to trusted systems. Apply relevant Red Hat updates when they become available.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Assisted Installer for Red Hat OpenShift Container Platform 2 | assisted/agent-preinstall-image-builder-rhel9 | Fix deferred | ||
| Builds for Red Hat OpenShift | openshift-builds/openshift-builds-controller-rhel10 | Fix deferred | ||
| Builds for Red Hat OpenShift | openshift-builds/openshift-builds-controller-rhel9 | Fix deferred | ||
| Builds for Red Hat OpenShift | openshift-builds/openshift-builds-git-cloner-rhel10 | Fix deferred | ||
| Builds for Red Hat OpenShift | openshift-builds/openshift-builds-git-cloner-rhel9 | Fix deferred | ||
| Builds for Red Hat OpenShift | openshift-builds/openshift-builds-image-bundler-rhel10 | Fix deferred | ||
| Builds for Red Hat OpenShift | openshift-builds/openshift-builds-image-bundler-rhel9 | Fix deferred | ||
| Builds for Red Hat OpenShift | openshift-builds/openshift-builds-image-processing-rhel10 | Fix deferred | ||
| Builds for Red Hat OpenShift | openshift-builds/openshift-builds-image-processing-rhel9 | Fix deferred | ||
| Builds for Red Hat OpenShift | openshift-builds/openshift-builds-waiters-rhel10 | Fix deferred |
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Дополнительная информация
Статус:
EPSS
5.3 Medium
CVSS3
Связанные уязвимости
Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connection down instead of buffering and blocking.
Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connection down instead of buffering and blocking.
Prevent DoS on deadlocked established channel in golang.org/x/crypto/ssh
Previously, after a channel has been established, a malicious peer cou ...
EPSS
5.3 Medium
CVSS3