DEBIAN-CVE-2023-4091

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Source
https://security-tracker.debian.org/tracker/CVE-2023-4091
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-4091.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2023-4091
Upstream
Published
2023-11-03T08:15:08Z
Modified
2025-09-30T05:16:10.009151Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Summary
[none]
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 "aclxattr" is configured with "aclxattr: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.

References

Affected packages

Debian:11 / samba

Package

Name
samba
Purl
pkg:deb/debian/samba?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2:4.13.13+dfsg-1~deb11u6

Affected versions

2:4.*

2:4.13.5+dfsg-2
2:4.13.13+dfsg-1~deb11u1
2:4.13.13+dfsg-1~deb11u2
2:4.13.13+dfsg-1~deb11u3
2:4.13.13+dfsg-1~deb11u4
2:4.13.13+dfsg-1~deb11u5

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:12 / samba

Package

Name
samba
Purl
pkg:deb/debian/samba?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2:4.17.12+dfsg-0+deb12u1

Affected versions

2:4.*

2:4.17.8+dfsg-2
2:4.17.8+dfsg-2.1
2:4.17.9+dfsg-0+deb12u1
2:4.17.9+dfsg-0+deb12u2
2:4.17.9+dfsg-0+deb12u3~bpo11+1
2:4.17.9+dfsg-0+deb12u3
2:4.17.10+dfsg-0+deb12u1~bpo11+1
2:4.17.10+dfsg-0+deb12u1
2:4.17.11+dfsg-0+deb12u1
2:4.17.12+dfsg-0+deb12u1~bpo11+1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:13 / samba

Package

Name
samba
Purl
pkg:deb/debian/samba?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2:4.19.1+dfsg-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:14 / samba

Package

Name
samba
Purl
pkg:deb/debian/samba?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2:4.19.1+dfsg-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}