CVE-2023-4091— Samba: smb clients can truncate files with read-only permissions
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
缺省权限不正确
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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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 |
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