PT-2023-6232 · Samba+9 · Samba+9
Sri Nagasubramanian
·
Published
2023-08-02
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Updated
2025-09-19
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CVE-2023-4091
CVSS v2.0
7.1
High
| Vector | AV:N/AC:M/Au:N/C:N/I:C/A:N |
Name of the Vulnerable Software and Affected Versions
Samba (affected versions not specified)
Description
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. This could allow a remote attacker to read, modify, or delete files.
Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Incorrect Default Permissions
Improper Access Control
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Related Identifiers
Affected Products
Alt Linux
Almalinux
Astra Linux
Centos
Linuxmint
Red Hat
Red Os
Samba
Suse
Ubuntu