Описание
A race condition vulnerability was discovered in how signals are handled by OpenSSH's server (sshd). If a remote attacker does not authenticate within a set time period, then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). As a consequence of a successful attack, in the worst case scenario, an attacker may be able to perform a remote code execution (RCE) as an unprivileged user running the sshd server.
Отчет
Red Hat rates the severity of this flaw as Moderate for both Red Hat Enterprise Linux (RHEL) and OpenShift Container Platform (OCP). While there are many similarities to CVE-2024-6387, the important difference is that any possible remote code execution is limited to an unprivileged child of the SSHD server. This additional restriction on access reduces the overall security impact. This vulnerability only affects the versions of OpenSSH shipped with Red Hat Enterprise Linux 9. Upstream versions of sshd are not impacted by this flaw. The affected versions of OCP are 4.13, 4.14, 4.15, and 4.16 while 4.12 and earlier versions of OCP are not affected.
Меры по смягчению последствий
The process is identical to CVE-2024-6387, by disabling LoginGraceTime. See that CVE page for additional details.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | openssh | Not affected | ||
| Red Hat Enterprise Linux 6 | openssh | Not affected | ||
| Red Hat Enterprise Linux 7 | openssh | Not affected | ||
| Red Hat Enterprise Linux 8 | openssh | Not affected | ||
| Red Hat Enterprise Linux 9 | openssh | Fixed | RHSA-2024:4457 | 10.07.2024 |
| Red Hat Enterprise Linux 9 | openssh | Fixed | RHSA-2024:4457 | 10.07.2024 |
| Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | openssh | Fixed | RHSA-2024:4910 | 30.07.2024 |
| Red Hat Enterprise Linux 9.2 Extended Update Support | openssh | Fixed | RHSA-2024:4716 | 23.07.2024 |
| Red Hat OpenShift Container Platform 4.13 | rhcos-413.92.202408122222 | Fixed | RHSA-2024:5444 | 22.08.2024 |
| Red Hat OpenShift Container Platform 4.14 | rhcos-414.92.202407300859 | Fixed | RHSA-2024:4960 | 07.08.2024 |
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Дополнительная информация
Статус:
7 High
CVSS3
Связанные уязвимости
A race condition vulnerability was discovered in how signals are handled by OpenSSH's server (sshd). If a remote attacker does not authenticate within a set time period, then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). As a consequence of a successful attack, in the worst case scenario, an attacker may be able to perform a remote code execution (RCE) as an unprivileged user running the sshd server.
A race condition vulnerability was discovered in how signals are handled by OpenSSH's server (sshd). If a remote attacker does not authenticate within a set time period, then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). As a consequence of a successful attack, in the worst case scenario, an attacker may be able to perform a remote code execution (RCE) as an unprivileged user running the sshd server.
A race condition vulnerability was discovered in how signals are handl ...
A signal handler race condition vulnerability was found in OpenSSH's server (sshd), where a client does not authenticate within LoginGraceTime seconds (120 by default, 600 in old OpenSSH versions), then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). This issue leaves it vulnerable to a signal handler race condition on the cleanup_exit() function, which introduces the same vulnerability as CVE-2024-6387 in the unprivileged child of the SSHD server.
7 High
CVSS3