CVE-2021-3178

Advisory lineage Upstream: 0 Downstream: 10
Modified
Published: 19 Jan 2021, 06:44
Last modified:03 Aug 2024, 16:45

Vulnerability Summary

Overall Risk (default)
medium
26/100
CVSS Score
6.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.18% LOW
0% probability +0.02%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

19 Jan 2021, 06:44
Published
Vulnerability first disclosed
03 Aug 2024, 16:45
Last Modified
Vulnerability information updated

Description

fs/nfsd/nfs3xdr.c in the Linux kernel through 5.10.8, when there is an NFS export of a subdirectory of a filesystem, allows remote attackers to traverse to other parts of the filesystem via READDIRPLUS. NOTE: some parties argue that such a subdirectory export is not intended to prevent this attack; see also the exports(5) no_subtree_check default behavior

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
  • v2.0•MEDIUM•Score: 5.5AV:N/AC:L/Au:S/C:P/I:P/A:N

EPSS Trends

Current EPSS score: 0.18%• Percentile: 39%

Techniques & Countermeasures

  • CWE-22•Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

    The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Affected Systems

  • debian•debian_linux

    9.0

  • fedoraproject•fedora

    33

  • linux•linux_kernel

    ≤ 5.10.8

References (4)