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CVE-2023-4091 Detail

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.


Metrics

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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://access.redhat.com/errata/RHSA-2023:6209 Third Party Advisory 
https://access.redhat.com/errata/RHSA-2023:6744 Third Party Advisory 
https://access.redhat.com/errata/RHSA-2023:7371
https://access.redhat.com/errata/RHSA-2023:7408
https://access.redhat.com/errata/RHSA-2023:7464
https://access.redhat.com/errata/RHSA-2023:7467
https://access.redhat.com/security/cve/CVE-2023-4091 Third Party Advisory 
https://bugzilla.redhat.com/show_bug.cgi?id=2241882 Issue Tracking 
https://bugzilla.samba.org/show_bug.cgi?id=15439 Issue Tracking 
https://www.samba.org/samba/security/CVE-2023-4091.html Vendor Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-276 Incorrect Default Permissions cwe source acceptance level NIST   Red Hat, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

11 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2023-4091
NVD Published Date:
11/03/2023
NVD Last Modified:
09/16/2024
Source:
Red Hat, Inc.