Описание
The source-address critical option in the Permissions returned by an authentication callback was only enforced for the PublicKeyCallback and VerifiedPublicKeyCallback paths, extending the fix for CVE-2026-46595. Permissions returned by the PasswordCallback, KeyboardInteractiveCallback, NoClientAuthCallback, and GSSAPIWithMICConfig.AllowLogin callbacks were not validated against the client's remote address, so a source-address restriction set by those callbacks was silently ignored. The check is now applied to the Permissions returned by any authentication callback.
A flaw was found in golang.org/x/crypto/ssh. The component failed to properly enforce source-address restrictions for several authentication methods, including password and keyboard-interactive callbacks. In applications that misuse the ServerConfig.PublicKeyCallback callback to make security relevant authorization decisions, an attacker with a valid key could bypass network-based access controls to gain additional privileges.
Отчет
This vulnerability severity is Important due to the requirement that an attacker already have a valid private key. A flaw in golang.org/x/crypto/ssh allows remote attackers to bypass source-address restrictions for certain authentication methods. This would allow an attacker to use a valid key for gaining additional privileges outside of the bounds of the network-based access controls.
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 |
|---|---|---|---|---|
| Assisted Installer for Red Hat OpenShift Container Platform 2 | assisted/agent-preinstall-image-builder-rhel9 | Under investigation | ||
| Confidential Compute Attestation | openshift-sandboxed-containers/osc-cloud-api-adaptor-rhel9 | Under investigation | ||
| Confidential Compute Attestation | openshift-sandboxed-containers/osc-podvm-payload-rhel9 | Under investigation | ||
| Confidential Compute Attestation | openshift-sandboxed-containers/osc-rhel9-operator | Under investigation | ||
| ExternalDNS Operator | edo/external-dns-rhel9 | Affected | ||
| External Secrets Operator for Red Hat OpenShift | external-secrets-operator/external-secrets-rhel9 | Under investigation | ||
| Logging Subsystem for Red Hat OpenShift | openshift-logging/cluster-logging-rhel9-operator | Affected | ||
| Multicluster Engine for Kubernetes | multicluster-engine/addon-manager-rhel9 | Not affected | ||
| Multicluster Engine for Kubernetes | multicluster-engine/assisted-installer-agent-rhel9 | Under investigation | ||
| Multicluster Engine for Kubernetes | multicluster-engine/assisted-service-8-rhel8 | Under investigation |
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Дополнительная информация
Статус:
EPSS
6.8 Medium
CVSS3
Связанные уязвимости
The source-address critical option in the Permissions returned by an authentication callback was only enforced for the PublicKeyCallback and VerifiedPublicKeyCallback paths, extending the fix for CVE-2026-46595. Permissions returned by the PasswordCallback, KeyboardInteractiveCallback, NoClientAuthCallback, and GSSAPIWithMICConfig.AllowLogin callbacks were not validated against the client's remote address, so a source-address restriction set by those callbacks was silently ignored. The check is now applied to the Permissions returned by any authentication callback.
The source-address critical option in the Permissions returned by an authentication callback was only enforced for the PublicKeyCallback and VerifiedPublicKeyCallback paths, extending the fix for CVE-2026-46595. Permissions returned by the PasswordCallback, KeyboardInteractiveCallback, NoClientAuthCallback, and GSSAPIWithMICConfig.AllowLogin callbacks were not validated against the client's remote address, so a source-address restriction set by those callbacks was silently ignored. The check is now applied to the Permissions returned by any authentication callback.
The source-address critical option in the Permissions returned by an a ...
The source-address critical option in the Permissions returned by an authentication callback was only enforced for the PublicKeyCallback and VerifiedPublicKeyCallback paths, extending the fix for CVE-2026-46595. Permissions returned by the PasswordCallback, KeyboardInteractiveCallback, NoClientAuthCallback, and GSSAPIWithMICConfig.AllowLogin callbacks were not validated against the client's remote address, so a source-address restriction set by those callbacks was silently ignored. The check is now applied to the Permissions returned by any authentication callback.
EPSS
6.8 Medium
CVSS3