Описание
ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources, potentially leading to code execution when a ProxyCommand is used. The untrusted sources are the command line and %-sequence expansion of a configuration file. (A configuration file that provides a complete literal username is not categorized as an untrusted source.)
A flaw was found in OpenSSH where control characters in usernames were not properly validated when sourced from untrusted inputs like the command line or configuration expansion. If a ProxyCommand is used, these control characters could modify command behavior, potentially leading to code execution.
Отчет
The impact is MODERATE because it is a critical component used across many Red Hat products. The issue occurs only when a ProxyCommand is configured and the SSH client handles a username containing control characters from an untrusted source, such as script-generated input or expanded configuration values.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 6 | openssh | Out of support scope | ||
| Red Hat Enterprise Linux 7 | openssh | Fix deferred | ||
| Red Hat OpenShift Container Platform 4 | openshift/ose-rhel-coreos-8 | Fix deferred | ||
| Red Hat OpenShift Container Platform 4 | openshift/ose-rhel-coreos-9 | Fix deferred | ||
| Red Hat Enterprise Linux 10 | openssh | Fixed | RHSA-2025:23479 | 17.12.2025 |
| Red Hat Enterprise Linux 10.0 Extended Update Support | openssh | Fixed | RHSA-2026:1678 | 02.02.2026 |
| Red Hat Enterprise Linux 8 | openssh | Fixed | RHSA-2025:23481 | 17.12.2025 |
| Red Hat Enterprise Linux 8 | openssh | Fixed | RHSA-2025:23481 | 17.12.2025 |
| Red Hat Enterprise Linux 9 | openssh | Fixed | RHSA-2025:23480 | 17.12.2025 |
| Red Hat Enterprise Linux 9 | openssh | Fixed | RHSA-2025:23480 | 17.12.2025 |
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Дополнительная информация
Статус:
5.3 Medium
CVSS3
Связанные уязвимости
ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources, potentially leading to code execution when a ProxyCommand is used. The untrusted sources are the command line and %-sequence expansion of a configuration file. (A configuration file that provides a complete literal username is not categorized as an untrusted source.)
ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources, potentially leading to code execution when a ProxyCommand is used. The untrusted sources are the command line and %-sequence expansion of a configuration file. (A configuration file that provides a complete literal username is not categorized as an untrusted source.)
ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources, potentially leading to code execution when a ProxyCommand is used. The untrusted sources are the command line and %-sequence expansion of a configuration file. (A configuration file that provides a complete literal username is not categorized as an untrusted source.)
ssh in OpenSSH before 10.1 allows control characters in usernames that ...
5.3 Medium
CVSS3