** DISPUTED ** 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.
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
https://patchwork.kernel.org/project/linux-nfs/patch/[email protected]/
Source: MITRE
Published: 2021-01-19
Updated: 2021-03-25
Type: CWE-22
Base Score: 5.5
Vector: AV:N/AC:L/Au:S/C:P/I:P/A:N
Impact Score: 4.9
Exploitability Score: 8
Severity: MEDIUM
Base Score: 6.5
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Impact Score: 5.2
Exploitability Score: 1.2
Severity: MEDIUM