CVE-2023-6660 NFS client data corruption and kernel memory disclosure
An unprivileged user can trigger NFS client bugs to disclose sensitive kernel memory or corrupt data written to NFS mounts.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-6660?
CVE-2023-6660 is a medium-severity vulnerability in Freebsd Freebsd, published on 13 Dec 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2023-6660?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2023-6660?
No fix has been published for CVE-2023-6660 yet. Limit exposure of the affected software until one is available.
Is CVE-2023-6660 being exploited?
There is no known exploitation of CVE-2023-6660 in the wild and no public exploit code.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as GHSA-cvh9-m5vp-qhrv.