CVE-2024-7589— FreeBSD 安全漏洞

OpenSSH pre-authentication async signal safety issue

A signal handler in sshd(8) may call a logging function that is not async-signal-safe. The signal handler is invoked when a client does not authenticate within the LoginGraceTime seconds (120 by default). This signal handler executes in the context of the sshd(8)'s privileged code, which is not sandboxed and runs with full root privileges. This issue is another instance of the problem in CVE-2024-6387 addressed by FreeBSD-SA-24:04.openssh. The faulty code in this case is from the integration of blacklistd in OpenSSH in FreeBSD. As a result of calling functions that are not async-signal-safe in the privileged sshd(8) context, a race condition exists that a determined attacker may be able to exploit to allow an unauthenticated remote code execution as root.

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FreeBSD 安全漏洞

FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在安全漏洞，该漏洞源于sshd(8)中的信号处理程序可能会调用非异步信号安全的日志记录函数，导致竞争条件，攻击者可以利用该漏洞以root身份执行未经身份验证的远程代码。

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