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CVE-2023-4091

Samba: smb clients can truncate files with read-only permissions PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
Red Hat / Red Hat Enterprise Linux 8unaffected 0:4.18.6-2.el8_9 before *
Red Hat / Red Hat Enterprise Linux 8unaffected 0:4.18.6-2.el8_9 before *
Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Supportunaffected 0:4.15.5-13.el8_6 before *
Red Hat / Red Hat Enterprise Linux 8.8 Extended Update Supportunaffected 0:4.17.5-4.el8_8 before *
Red Hat / Red Hat Enterprise Linux 9unaffected 0:4.18.6-101.el9_3 before *
Red Hat / Red Hat Enterprise Linux 9unaffected 0:4.18.6-101.el9_3 before *
Red Hat / Red Hat Enterprise Linux 9.0 Extended Update Supportunaffected 0:4.15.5-111.el9_0 before *
Red Hat / Red Hat Enterprise Linux 9.2 Extended Update Supportunaffected 0:4.17.5-104.el9_2 before *
Red Hat / Red Hat Virtualization 4 for Red Hat Enterprise Linux 8unaffected 0:4.15.5-13.el8_6 before *
Red Hat / Red Hat Enterprise Linux 6unknown
Red Hat / Red Hat Enterprise Linux 6unknown
Red Hat / Red Hat Enterprise Linux 7unknown
Red Hat / Red Hat Storage 3unknown

CWE

CWE-276

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

CVE

No English description supplied.