#VU84346 State Issues in FreeBSD - CVE-2023-6660
Published: December 12, 2023
FreeBSD
FreeBSD Foundation
Description
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists due to an error within the NFS client when appending data to file on an network share. 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.
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.