Overview
- 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
- secalert@redhat.com
- NVD status
- Modified
Risk scores
CVSS 3.1
- Type
- Primary
- Base score
- 6.5
- Impact score
- 3.6
- Exploitability score
- 2.8
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- Severity
- MEDIUM
Social media
- Hype score
- Not currently trending
Configurations
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{
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{
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"versionEndExcluding": "4.17.12"
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"versionEndExcluding": "4.18.8",
"versionStartIncluding": "4.18.0"
},
{
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"versionEndExcluding": "4.19.1",
"versionStartIncluding": "4.19.0"
}
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"operator": "OR"
}
]
},
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