cbcvebase.
CVE-2024-46695
published 2024-09-13

CVE-2024-46695: In the Linux kernel, the following vulnerability has been resolved: selinux,smack: don't bypass permissions check in inode_setsecctx hook Marek Gresko reports…

PriorityP420medium4.4CVSS 3.1
AVLACLPRHUINSUCNIHAN
EPSS
0.53%
41.7th percentile
In the Linux kernel, the following vulnerability has been resolved:

selinux,smack: don't bypass permissions check in inode_setsecctx hook

Marek Gresko reports that the root user on an NFS client is able to
change the security labels on files on an NFS filesystem that is
exported with root squashing enabled.

The end of the kerneldoc comment for __vfs_setxattr_noperm() states:

* This function requires the caller to lock the inode's i_mutex before it
* is executed. It also assumes that the caller will make the appropriate
* permission checks.

nfsd_setattr() does do permissions checking via fh_verify() and
nfsd_permission(), but those don't do all the same permissions checks
that are done by security_inode_setxattr() and its related LSM hooks do.

Since nfsd_setattr() is the only consumer of security_inode_setsecctx(),
simplest solution appears to be to replace the call to
__vfs_setxattr_noperm() with a call to __vfs_setxattr_locked(). This
fixes the above issue and has the added benefit of causing nfsd to
recall conflicting delegations on a file when a client tries to change
its security label.

Affected

28 ranges· showing 25
VendorProductVersion rangeFixed in
debianlinux< linux 6.1.115-1 (bookworm)linux 6.1.115-1 (bookworm)
debianlinux-6.1< linux 6.1.115-1 (bookworm)linux 6.1.115-1 (bookworm)
linuxlinux
linuxlinux>= 18032ca062e621e15683cb61c066ef3dc5414a7b < 2dbc4b7bac60b02cc6e70d05bf6a7dfd551f9dda2dbc4b7bac60b02cc6e70d05bf6a7dfd551f9dda
linuxlinux>= 18032ca062e621e15683cb61c066ef3dc5414a7b < fe0cd53791119f6287b6532af8ce41576d664930fe0cd53791119f6287b6532af8ce41576d664930
linuxlinux>= 18032ca062e621e15683cb61c066ef3dc5414a7b < eebec98791d0137e455cc006411bb92a54250924eebec98791d0137e455cc006411bb92a54250924
linuxlinux>= 18032ca062e621e15683cb61c066ef3dc5414a7b < 459584258d47ec3cc6245a82e8a49c9d08eb8b57459584258d47ec3cc6245a82e8a49c9d08eb8b57
linuxlinux>= 18032ca062e621e15683cb61c066ef3dc5414a7b < f71ec019257ba4f7ab198bd948c5902a207bad96f71ec019257ba4f7ab198bd948c5902a207bad96
linuxlinux>= 18032ca062e621e15683cb61c066ef3dc5414a7b < 76a0e79bc84f466999fa501fce5bf7a07641b8a776a0e79bc84f466999fa501fce5bf7a07641b8a7
linuxlinux_kernel< 6.6.496.6.49
linuxlinux_kernel
linuxlinux_kernel
linuxlinux_kernel
linuxlinux_kernel
linuxlinux_kernel
linuxlinux_kernel>= 0 < 5.10.234-15.10.234-1
linuxlinux_kernel>= 0 < 6.1.115-16.1.115-1
linuxlinux_kernel>= 0 < 6.10.9-16.10.9-1
linuxlinux_kernel>= 0 < 6.10.9-16.10.9-1
linuxlinux_kernel>= 0 < 5.15.0-127.1375.15.0-127.137
linuxlinux_kernel>= 0 < 6.8.0-50.516.8.0-50.51
linuxlinux_kernel>= 6.7 < 6.10.86.10.8
msrcazl3_kernel_6.6.47.1-1_on_azure_linux_3.0
msrcazl3_kernel_6.6.51.1-5_on_azure_linux_3.0
msrcazure_linux_3.0_arm

CVSS provenance

nvdv3.14.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
osv8.8HIGH
vendor_ubuntu8.8HIGH
vendor_debian4.4MEDIUM
vendor_msrc4.4MEDIUM
vendor_redhat4.4MEDIUM
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