Linux NFSv3 Clients Can Access Sensitive Directories

Summary

A recent vulnerability in the Linux NFSv3 service allows remote clients to access sensitive directories on a server, even if permissions are set to prevent it. This could expose confidential data. To fix this, update your Linux system with the latest nfs-utils package.

What to do

No fix is available yet. Check with your software vendor for updates.

Affected software

Vendor	Product	Affected versions	Fix available
redhat	openshift_container_platform	4.0	–
redhat	enterprise_linux	6.0	–
redhat	enterprise_linux	7.0	–
redhat	enterprise_linux	8.0	–
redhat	enterprise_linux	9.0	–
redhat	enterprise_linux	10.0	–
linux-nfs	nfs-utils	All versions	–

Original title

A vulnerability was recently discovered in the rpc.mountd daemon in the nfs-utils package for Linux, that allows a NFSv3 client to escalate the privileges assigned to it in the /etc/exports file at...

Original description

A vulnerability was recently discovered in the rpc.mountd daemon in the nfs-utils package for Linux, that allows a NFSv3 client to escalate the
privileges assigned to it in the /etc/exports file at mount time. In particular, it allows the client to access any subdirectory or subtree of an exported directory, regardless of the set file permissions, and regardless of any 'root_squash' or 'all_squash' attributes that would normally be expected to apply to that client.

nvd CVSS3.1 6.5

Vulnerability type

CWE-279

CWE-732 Incorrect Permission Assignment for Critical Resource