ghsa-f6jj-3gjw-frjm
Vulnerability from github
Published
2023-11-03 09:32
Modified
2024-04-22 18:30
Severity ?
Details
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": [], "aliases": [ "CVE-2023-4091" ], "database_specific": { "cwe_ids": [ "CWE-276" ], "github_reviewed": false, "github_reviewed_at": null, "nvd_published_at": "2023-11-03T08:15:08Z", "severity": "MODERATE" }, "details": "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\u0027s permissions.", "id": "GHSA-f6jj-3gjw-frjm", "modified": "2024-04-22T18:30:47Z", "published": "2023-11-03T09:32:49Z", "references": [ { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-4091" }, { "type": "WEB", "url": "https://access.redhat.com/errata/RHSA-2023:6209" }, { "type": "WEB", "url": "https://access.redhat.com/errata/RHSA-2023:6744" }, { "type": "WEB", "url": "https://access.redhat.com/errata/RHSA-2023:7371" }, { "type": "WEB", "url": "https://access.redhat.com/errata/RHSA-2023:7408" }, { "type": "WEB", "url": "https://access.redhat.com/errata/RHSA-2023:7464" }, { "type": "WEB", "url": "https://access.redhat.com/errata/RHSA-2023:7467" }, { "type": "WEB", "url": "https://access.redhat.com/security/cve/CVE-2023-4091" }, { "type": "WEB", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2241882" }, { "type": "WEB", "url": "https://bugzilla.samba.org/show_bug.cgi?id=15439" }, { "type": "WEB", "url": "https://lists.debian.org/debian-lts-announce/2024/04/msg00015.html" }, { "type": "WEB", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZUMVALLFFDFC53JZMUWA6HPD7HUGAP5I" }, { "type": "WEB", "url": "https://security.netapp.com/advisory/ntap-20231124-0002" }, { "type": "WEB", "url": "https://www.samba.org/samba/security/CVE-2023-4091.html" } ], "schema_version": "1.4.0", "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "type": "CVSS_V3" } ] }
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Sightings
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Nomenclature
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- Confirmed: The vulnerability is confirmed from an analyst perspective.
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- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.