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CVE-2023-6660— NFS client data corruption and kernel memory disclosure

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 13.2版本和14.0版本存在安全漏洞，该漏洞源于NFS客户端存在信息泄露漏洞。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.62% · P48

Possible ATT&CK Techniques 1 AI

T1115 · Clipboard Data
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I. Basic Information for CVE-2023-6660

Vulnerability Information
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Vulnerability Title
NFS client data corruption and kernel memory disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
When a program running on an affected system appends data to a file via an NFS client mount, the bug can cause the NFS client to fail to copy in the data to be written but proceed as though the copy operation had succeeded. This means that the data to be written is instead replaced with whatever data had been in the packet buffer previously. Thus, an unprivileged user with access to an affected system may abuse the bug to trigger disclosure of sensitive information. In particular, the leak is limited to data previously stored in mbufs, which are used for network transmission and reception, and for certain types of inter-process communication. The bug can also be triggered unintentionally by system applications, in which case the data written by the application to an NFS mount may be corrupted. Corrupted data is written over the network to the NFS server, and thus also susceptible to being snooped by other hosts on the network. Note that the bug exists only in the NFS client; the version and implementation of the server has no effect on whether a given system is affected by the problem.
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 13.2版本和14.0版本存在安全漏洞，该漏洞源于NFS客户端存在信息泄露漏洞。
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 14.0-RELEASE ~ p3 -

II. Public POCs for CVE-2023-6660

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III. Intelligence Information for CVE-2023-6660

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Vendor Advisories for CVE-2023-6660 (1)

Other References for CVE-2023-6660 (1)

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD

V. Comments for CVE-2023-6660

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