CVE-2024-46695
"NFS SELinux Smack: Root Squashing Permission Bypass"
Description
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.
INFO
Published Date :
Sept. 13, 2024, 6:15 a.m.
Last Modified :
Oct. 17, 2024, 2:15 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
0.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2024-46695.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2024-46695 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-46695 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 17, 2024
Action Type Old Value New Value Added Reference kernel.org https://git.kernel.org/stable/c/2dbc4b7bac60b02cc6e70d05bf6a7dfd551f9dda [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/fe0cd53791119f6287b6532af8ce41576d664930 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/eebec98791d0137e455cc006411bb92a54250924 [No types assigned] -
Initial Analysis by [email protected]
Sep. 19, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N Changed Reference Type https://git.kernel.org/stable/c/459584258d47ec3cc6245a82e8a49c9d08eb8b57 No Types Assigned https://git.kernel.org/stable/c/459584258d47ec3cc6245a82e8a49c9d08eb8b57 Patch Changed Reference Type https://git.kernel.org/stable/c/76a0e79bc84f466999fa501fce5bf7a07641b8a7 No Types Assigned https://git.kernel.org/stable/c/76a0e79bc84f466999fa501fce5bf7a07641b8a7 Patch Changed Reference Type https://git.kernel.org/stable/c/f71ec019257ba4f7ab198bd948c5902a207bad96 No Types Assigned https://git.kernel.org/stable/c/f71ec019257ba4f7ab198bd948c5902a207bad96 Patch Added CWE NIST CWE-276 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 6.6.49 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.10.8 *cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.11:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.11:rc5:*:*:*:*:*:* -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 13, 2024
Action Type Old Value New Value Added Description 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. Added Reference kernel.org https://git.kernel.org/stable/c/459584258d47ec3cc6245a82e8a49c9d08eb8b57 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/f71ec019257ba4f7ab198bd948c5902a207bad96 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/76a0e79bc84f466999fa501fce5bf7a07641b8a7 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-46695 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-46695
weaknesses.