Vulnerability Monitor

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CVE-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.

Published

2023-11-03T08:15:08.197

Last Modified

2024-11-21T08:34:22.283

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.5 (MEDIUM)

Weaknesses
  • Type: Secondary
    CWE-276
  • Type: Primary
    CWE-276
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application samba samba < 4.17.12 Yes
Application samba samba < 4.18.8 Yes
Application samba samba < 4.19.1 Yes
Operating System fedoraproject fedora 39 Yes
Application redhat storage 3.0 Yes
Operating System redhat enterprise_linux 8.0 Yes
Operating System redhat enterprise_linux_eus 9.0 Yes
References