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CVE-2023-4091— Samba: smb clients can truncate files with read-only permissions

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 8
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Samba是用于 Linux 和 Unix 的标准 Windows 互操作性程序套件。 Samba 4.1 及之前版本存在安全漏洞，该漏洞源于客户端可以截断具有只读权限的文件。

CVSS 6.5 · Medium EPSS 1.18% · P67
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I. Basic Information for CVE-2023-4091

Vulnerability Information
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Vulnerability Title
Samba: smb clients can truncate files with read-only permissions
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
缺省权限不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Samba 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Samba是用于 Linux 和 Unix 的标准 Windows 互操作性程序套件。 Samba 4.1 及之前版本存在安全漏洞，该漏洞源于客户端可以截断具有只读权限的文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 8 0:4.18.6-2.el8_9 ~ * cpe:/o:redhat:enterprise_linux:8::baseos
Red Hat Red Hat Enterprise Linux 8 0:4.18.6-2.el8_9 ~ * cpe:/o:redhat:enterprise_linux:8::baseos
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support 0:4.15.5-13.el8_6 ~ * cpe:/o:redhat:rhel_eus:8.6::baseos
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support 0:4.17.5-4.el8_8 ~ * cpe:/a:redhat:rhel_eus:8.8::appstream
Red Hat Red Hat Enterprise Linux 9 0:4.18.6-101.el9_3 ~ * cpe:/o:redhat:enterprise_linux:9::baseos
Red Hat Red Hat Enterprise Linux 9 0:4.18.6-101.el9_3 ~ * cpe:/o:redhat:enterprise_linux:9::baseos
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support 0:4.15.5-111.el9_0 ~ * cpe:/a:redhat:rhel_eus:9.0::resilientstorage
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:4.17.5-104.el9_2 ~ * cpe:/a:redhat:rhel_eus:9.2::appstream
Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 0:4.15.5-13.el8_6 ~ * cpe:/o:redhat:rhel_eus:8.6::baseos
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Storage 3 - cpe:/a:redhat:storage:3

II. Public POCs for CVE-2023-4091

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III. Intelligence Information for CVE-2023-4091

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Vendor Advisories for CVE-2023-4091 (8)

Mailing List Discussions for CVE-2023-4091 (2)

Other References for CVE-2023-4091 (1)

Same Patch Batch · Red Hat · 2023-11-03 · 5 CVEs total

CVE-2023-3961 9.1 CRITICAL Samba: smbd allows client access to unix domain sockets on the file system as root
CVE-2023-5824 7.5 HIGH Squid: dos against http and https
CVE-2023-1476 7.0 HIGH Kpatch: mm/mremap.c: incomplete fix for cve-2022-41222
CVE-2023-5088 6.4 MEDIUM Qemu: improper ide controller reset can lead to mbr overwrite

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 8
Same vendor: Red Hat
Same weakness: CWE-276

V. Comments for CVE-2023-4091

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