// For flags

CVE-2023-6660

NFS client data corruption and kernel memory disclosure

Severity Score

6.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

Cuando un programa que se ejecuta en un sistema afectado agrega datos a un archivo a través de un montaje de NFS client, el error puede provocar que el NFS client no pueda copiar los datos que se van a escribir, pero proceda como si la operación de copia se hubiera realizado correctamente. Esto significa que los datos que se van a escribir se reemplazan con cualquier dato que haya estado previamente en el búfer de paquetes. Por lo tanto, un usuario sin privilegios con acceso a un sistema afectado puede abusar del error para provocar la divulgación de información confidencial. En particular, la filtración se limita a datos previamente almacenados en mbufs, que se utilizan para la transmisión y recepción de la red, y para ciertos tipos de comunicación entre procesos. El error también puede ser provocado involuntariamente por aplicaciones del sistema, en cuyo caso los datos escritos por la aplicación en un montaje NFS pueden estar dañados. Los datos corruptos se escriben a través de la red en el servidor NFS y, por lo tanto, también son susceptibles de ser espiados por otros hosts de la red. Tenga en cuenta que el error existe sólo en el NFS client; la versión y la implementación del servidor no tienen ningún efecto sobre si un sistema determinado se ve afectado por el problema.

*Credits: Hostpoint AG
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2023-12-11 CVE Reserved
  • 2023-12-13 CVE Published
  • 2024-08-02 CVE Updated
  • 2024-11-12 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Freebsd
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Freebsd
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13.2
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-
Affected
Freebsd
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Freebsd
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13.2
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p1
Affected
Freebsd
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Freebsd
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13.2
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p2
Affected
Freebsd
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Freebsd
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13.2
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p3
Affected
Freebsd
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Freebsd
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13.2
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p4
Affected
Freebsd
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Freebsd
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13.2
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p5
Affected
Freebsd
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Freebsd
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13.2
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p6
Affected
Freebsd
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Freebsd
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13.2
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p7
Affected
Freebsd
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Freebsd
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14.0
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-
Affected
Freebsd
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Freebsd
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14.0
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beta5
Affected
Freebsd
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Freebsd
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14.0
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p1
Affected
Freebsd
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Freebsd
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14.0
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p2
Affected
Freebsd
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Freebsd
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14.0
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rc3
Affected
Freebsd
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Freebsd
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14.0
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rc4-p1
Affected