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CVE-2024-7589— OpenSSH pre-authentication async signal safety issue

Quick assessment

Affected
FreeBSD FreeBSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

AI Predicted 9.8 Difficulty: Easy EPSS 2.04% · P81
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I. Basic Information for CVE-2024-7589

Vulnerability Information
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Vulnerability Title
OpenSSH pre-authentication async signal safety issue
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeBSD FreeBSD 14.1-RELEASE ~ p3 -

II. Public POCs for CVE-2024-7589

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III. Intelligence Information for CVE-2024-7589

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Vendor Advisories for CVE-2024-7589 (2)

Other References for CVE-2024-7589 (1)

Same Patch Batch · FreeBSD · 2024-08-11 · 4 CVEs total

CVE-2024-6759 NFS client accepts file names containing path separators
CVE-2024-6760 ktrace(2) fails to detach when executing a setuid binary
CVE-2024-6640 pf incorrectly matches different ICMPv6 states in the state table

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD