CVSS 3.1
6.5 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:NCVE-2023-4091
A vulnerability was discovered in Samba, where the flaw allows SMB clients to truncate files, even with read-only permissions when the Samba VFS module "acl_xattr" is configured with "acl_xattr:ignore system acls = yes". The SMB protocol allows opening files when the client requests read-only access but then implicitly truncates the opened file to 0 bytes if the client specifies a separate OVERWRITE create disposition request. The issue arises in configurations that bypass kernel file system permissions checks, relying solely on Samba's permissions.
Severity
- EPSS
- 1.3% chance of exploitation in the next 30 days; higher than 71% of CVEs (scores of 2026-10-31)
- CWE
- CWE-276
- Published
- Modified
- Record from
- the NVD, synced
Affected
- fedoraproject:fedora
- redhat:enterprise_linux
- redhat:enterprise_linux_eus
- redhat:storage
- samba:samba